PATENT ABSTRACT
A communication protocol includes a packet protocol, which includes a protocol field for indicating the type of protocol, a length of data field for listing the length in bytes of the data field, a data field containing sub protocol data, and a checksum for determining the integrity of the packet.

PATENT DESCRIPTION
This application claims the benefit of Ser. No. 60/131,605 filed Apr. 29, 1999. 
    
    
     TECHNICAL FIELD OF THE INVENTION 
     This invention is related in general to the field of network control systems. More particularly, the invention is related to an Internet control system communication protocol and method. 
     BACKGROUND OF THE INVENTION 
     In a fully automated environment, appliances that change the various parameters of the environment can be inked to a control area network (CAN) and a controller. The appliances may include heating, ventilation and air conditioning (HVAC) systems, lighting systems, audio-visual systems, telecommunications systems, security systems, surveillance systems, and fire protection systems, for example. One or more easy-to-use user interface, such as a touch panel, may be electronically linked to the control area network to accept user input and display current system status. Panja, Inc. of Dallas, Tex. designs and manufactures such networked appliance control systems. 
     SUMMARY OF THE INVENTION 
     In accordance with the present invention, a system and method of Internet control network is provided which eliminates or substantially reduces the disadvantages associated with prior control systems. 
     In one aspect of the invention, the boundaries between the Internet and the control area network are made transparent and the Internet becomes a device on the control area network. The Internet is controllable by user input entered on the user interface, such as touch panel. The Internet is further capable of receiving commands from the master controller in the control area network. 
     In another aspect of the invention, Internet applications such as web browsers and applications executing on web servers of information content providers become devices on the control area network. The Internet applications are capable of sending commands to and receiving commands from the control area network. 
     In yet another aspect of the present in invention, a communication protocol is provided. The communication protocol comprises a packet protocol. The packet protocol has a protocol field for indicating the type of protocol, a length of data field for listing the length in bytes of the data field, a data field containing sub protocol data, and, a checksum for determining the integrity of the packet. 
     In yet another aspect of the invention, a dynamic message protocol generator is provided to enable a scripting language such as VBScript or JavaScript capable of directly communicating on any TCP/IP network connection. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     For a better understanding of the present invention, reference may be made to the accompanying drawings, in which: 
     FIG. 1 is a simplified top-level block diagram of a system and method of coupling one or more control systems to the Internet constructed according to an embodiment of the present invention; 
     FIG. 2 is a more detailed block diagram of a system and method of coupling one or more control systems to the Internet constructed according to an embodiment of the present invention; 
     FIG. 3 is a more detailed block diagram of the processes and communications between a web server and an Internet appliance server for coupling one or more control systems to the Internet constructed according to an embodiment of the present invention; 
     FIG. 4 is a more detailed block diagram of the Internet appliance server processes for coupling one or more control systems to the Internet constructed according to an embodiment of the present invention; 
     FIG. 5 is a more detailed block diagram of the Internet appliance server software device emulator processes for coupling one or more control systems to the Internet constructed according to an embodiment of the present invention; 
     FIG. 6 is a flowchart of a process in which a content provider is a control area network device according to an embodiment of the present invention; 
     FIG.  7 . is a flowchart of a process in which an Internet application is a control area network user interface according to an embodiment of the present invention; 
     FIG. 8 illustrates a block diagram of a control system in accordance with the teachings of the present invention; 
     FIG. 9 is a block diagram of a control area network device in accordance with the teachings of the present invention; 
     FIG. 10 is a block diagram of routing components of a control area network master; 
     FIG. 11 is an exemplary packet for messages in accordance to teaching the present invention; 
     FIG. 12 is an exemplary message structure in accordance to teaching the present invention; and 
     FIG. 13 is an exemplary message structure in accordance to teaching the present invention. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     FIG. 1 is a simplified top-level block diagram of a system and method  10  of Internet control system which couple one or more control systems to the Internet constructed according to the teachings of the present invention. The implications of employing system and method  10  of the present invention are the ability to communicate with, control, and be controlled by one or more Internet nodes or Internet applications that act as one or more devices in a control system connected by a control area network (CAN). These Internet applications may include web browsers, web server applications of information content providers, and email applications. In other words, the geographical and communication protocol boundaries are transparent between a local control area network and the Internet, so that the Internet, web information content providers and web browser applications become devices in the control system. By definition, a device in the control system can send control commands to and/or receive control messages from a master controller on the control area network. Hereinafter, the word Internet may be also used to refer to an Intranet or the World Wide Web and vice versa. 
     System  10  includes a control network portal  12  coupled between the Internet  22  and one or more control area networks  30  and  31 . Control area networks  30  and  31  are local area networks operating under transport protocols such as Ethernet, and AXLink and PhastLink of Panja, Inc. (Dallas, Tex.), the assignee of the present invention, that interconnect a variety of devices, appliances and/or equipment. The underlying network connectivity  34  may be wired, wireless, power line carriers, or any suitable transmission medium. Coupled to control area networks  30  and  31  are a plurality of devices, appliances and/or equipment, including control area network user interfaces (CAN UI/F)  35 , master controllers  36 , and Internet appliances  37 - 39 . Some devices may be coupled to control area networks  30  and  31  via additional intermediate communications devices, such as an RS 232 controller (not shown). 
     Control area network user interface device  35  is any device that is capable of receiving user input and displaying or indicating control network status. For example, a touch panel, a computer terminal with a monitor, keyboard and pointing device, and any device with similar functionalities may serve as control area network user interface  35 . As described in detail below, with the use of control area network portal  12  of the present invention, Internet applications are also capable of functioning as control area network user interface devices without the use of custom and dedicated applications on the user&#39;s end. 
     Master controller  36  is generally a CPU-based controller that controls the communications among user interface  35  and Internet appliances  37 - 39 . It is operable to receive user inputs received by user interface devices, such as commands, and instruct the appropriate Internet appliance to act according to the command. Master controller  36  may also poll each device in control area network  30  periodically to monitor its status. The system status and/or the status of each device may be sent to control area network user interface devices for display. 
     Internet appliances  37 - 39  are devices that can receive commands from master controller  36  and operate or act according to the command. Internet appliances  37 - 39  may include equipment that affect or monitor the various parameters of the premises. For example, Internet appliances  37 - 39  may include heating and air conditioning, lighting, video equipment, audio equipment, sprinklers, security cameras, infrared sensors, smoke detectors, etc. in a residential or commercial control area network. Household appliances, such as a hot tub, fireplace, microwave oven, coffee maker, etc. may also be Internet appliances coupled to the network. Internet appliances  37 - 39  may also be capable of providing a current status of its operational state to master controller  36 , such as on/off, temperature settings, current ambient temperature, light intensity settings, volume settings, threshold settings, and predetermined alphanumeric strings reflective of operational states. 
     Master controller  36  is also operable to receive user input from nodes of the Internet  22  via control network portal  12 . Connected to Internet  22  are content providers  25  and  26 , which may also function as control area network user interface devices. Content providers  25  and  26  are typically web servers that generate and provide static and/or dynamic information and content in the form of web pages. Content provider applications executing on the web server are able to mine data stored in databases (not shown). The web pages are typically developed with hypertext markup language (HTML), and various other scripting languages and programming environments such as Microsoft® Active Server Pages (ASP), Common Gateway Interface (CGI), Internet Server Application Programming Interface (ISAPI), JAVA, ActiveX, Cold Fusion, etc. that make the web pages more dynamic and interactive. 
     Also connected to the Internet  22  are web browsers  23  and  24  that may also serve as control area network user interfaces. Web browsers  23  and  24  are application programs that can be used to request web pages from content providers  25  and  25  and decode the web pages. Web browser applications include NETSCAPE NAVIGATOR® and MICROSOFT INTERNET EXPLORER®, for example. Typically, a user executes a web browser application on her personal computer and accesses the World Wide Web via a dial-up connection to an Internet service provider. The Internet or World Wide Web may also be accessed via other means such as cable modems and digital subscriber lines (DSL). The user makes a request for a particular web page or particular web site by entering or specifying a uniform resource locator (URL). The URL is associated with an Internet protocol (IP) address of the specified web site. Every computer connected to the World Wide Web and Internet has a unique IP address. This address is used to route message packets to specific computers and users. Internet protocol or IP is the message transport and communications protocol of the Internet and World Wide Web. 
     When the web browser requests a certain URL, a connection is first established with a web server of a content provider that is addressed by the URL. A hypertext transport protocol (HTTP) request is then issued to the web server to download an HTML file. The web server receives the request and sends a web page file to the web browser, which decodes the file to display information in specified format on the screen. Web pages with dynamic content provided by gateway interfaces such as CGI and ISAPI are executable applications that are run by the web server upon user request. The executing gateway application is able to read parameter information associated with the request and generate an output in the form of an HTML file in response to the parameter values. Another way to add dynamic and interactive content to web pages uses ASP. ASP scripts are server-side executable scripts that are directly incorporated in the HTML web pages. Upon request for the page, the web server executes the ASP script in response to input parameter values and generates the web page with dynamic content. 
     Using control network portal  12 , users may access control area networks  30  and  31  via web browsers  23  and  24  accessing web pages provided by control network portal  12  or value-added web pages provided by content providers  25  and  26 . For example, a user who has a control area network deployed in her luxury residence to control various aspects of the home environment may use a web browser application to remotely monitor her home. She may change the temperature setting to decrease energy use, for example, because she will be leaving on a business trip straight from work. She may also use the surveillance cameras to visually ensure security has not been breached. She may even be able to remotely program her VCR to record certain favorite programs that will be broadcast while she is away. 
     An example of value-added web pages provided by content providers is the provision of an interactive version of the television programming web page, www.tvguide.com. A user may request this web page, determine available program choices, and click on a certain program. Options may be provided to enable the user to turn on the television and tune to a particular channel scheduled to broadcast the selected program or to program the VCR to record the selected program. 
     Another example of value-added web pages provided by content providers is the provision of a secured web page that an electric company may access to slightly raise the temperature settings of the air conditioning systems of its participating customers in anticipation of high demand brown out conditions. Yet another example is a web page that a security company may use to access, monitor and control the security, surveillance and fire protection systems of its customers. 
     FIG. 2 is a more detailed block diagram of a system and method  10  of coupling one or more control system to the Internet constructed according to an embodiment of the present invention. Control area network portal  12  may include a web server  13  coupled to the Internet  22 . Web server  13  is also coupled to an Internet appliance (IA) server  14 , which may also be coupled to a control network server  40 . Control network server  40  is coupled to control area network  30  that links several appliances and systems, such as fire protection systems  50 , heating, ventilation and air conditioning (HVAC) systems  51 , lighting systems  52 , audio and visual systems  53 , and security systems  54 . Control area network  30  is also coupled to user interface devices  55  and master controller  36 . 
     It may be noted that control network portal  12  may be implemented by a single stand-alone system that has sufficient memory and processing power or several separate systems with distinct functions as shown in FIG.  2 . Web server  13  is operable to receive requests of web pages from web browser  23  and to respond by generating and providing the requested web pages. The information content of the web pages may be dynamically obtained by communicating with IA server  14 , which is operable to communicate with master controller  36  via control network server  40  to obtain status and other information. Control network server  40  is used only if there is protocol conversion or other control issues needed to operate the control area network. It may be thought of, logically, that IA server  14  is directly coupled to the network and functions as a device on the network. Commands entered at a web browser are sent to web server  13 , which relays the commands to master controller  36  via IA server  14  and control network server  40 . Master controller  36  then instructs appropriate appliances and/or systems in the control network to act according to the received command. 
     FIG. 3 is a more detailed block diagram of the processes and communications between a web server  13  and an Internet appliance server  14  for coupling one or more control systems to the Internet constructed according to an embodiment of the present invention. Web server  13  may include one or more CGI processes  70  for responding to CGI requests from the Internet and one or more ASP processes  76  for responding to ASP requests form the Internet. It is contemplated by the present invention that other processes able to handle other extensions to HTML or other types of requests may also be provided. It is also contemplated by the present invention that web server  13  may merely pass through the received IP message if extension processing is not required. Further, a special protocol process, such as an Internet control system protocol (ICSP) process, which takes the IP message from the Internet and forms a message of the type and protocol understood by IA server  14 . The ICSP protocol is designed by Panja, Inc. The CGI, ASP and other processes may be dynamically spawned when there is a request of the corresponding type received by web server  13 . ASP process  76  may include a dynamic protocol generator  82 , which enables web pages provided by web server  13  to generate, send and receive TCP/IP messages to IA server  14  and the Internet. In other words, dynamic protocol generator  82  enables a scripting language such as VBScript or JavaScript to be capable of directly communicating on any TCP/IP network connection. Details of dynamic protocol generator  82  are described below. 
     IA server  14  includes a CGI handler  72 , which communicates with CGI process  70 , and an ASP handler  78 , which communicates with ASP process  76 . Handlers  72  and  78  are operable to provide a translation function from IP to a protocol used in the control area networks, such as PhastLink or AXLink in Panja, Inc. control area networks. IA server  14  is operable to spawn a software logical or virtual device that is representative of or associated with a physical device directly connected to a control area network or a content provider coupled to the Internet. Multiple software logical devices may be connected to a single control area network or content provider, if needed. Devices, whether physical or logical, are assigned a system identifier (system ID) and a unique device identification number (device ID) used to indicate the destination or origination of messages. One or more protocol converters  92  may be provided to translate from the protocol used internally in IA server, such as ICSP, to other protocols used in the control area networks, such as AxLink or PhastLink. A protocol converter is not necessary if the protocols employed in IA server  14  and a control area network  30  are the same. 
     FIG. 4 is a more detailed block diagram of the Internet appliance server processes for coupling one or more control systems to the Internet constructed according to an embodiment of the present invention. Coupled to CGI handler  72  and ASP handler  78  is a software device emulator  90  that is operable to spawn one or more software logical devices  86 , which are software representations of devices connected to the control area networks or content providers connected to the Internet. Software device emulator  90  communicates with a protocol converter layer  92  which provides a protocol translation function between the IA server protocol and the control area network protocol, if they are different. A CAN transport protocol client  94  is also provided to communicate with the control area network coupled to IA server  14 . 
     By the use of software logical devices, Internet applications such as web content providers appear to IA server  14  no different than devices connected to a control area network. Therefore, it appears that Internet applications like content providers on the web are able to directly communicate with the master controllers of the control area networks to issue commands to devices in the control area networks. Similarly, Internet applications appear to be devices on the control area network that can be controlled by the master controller. The master controller is able to issue commands to the Internet applications. 
     FIG. 5 is a more detailed block diagram of the Internet appliance server software device emulator processes  90  for coupling one or more control systems to the Internet constructed according to an embodiment of the present invention. Emulator  90  includes an Internet control system protocol (ICSP) software device core  100 . Software device core 100 communicates with the web server via a device application program interface (API)  110 . Software device core  100  also communicates with the control area networks via control area network I/O queues  112 . Emulator  90  also includes a CAN input message processor  102 , a device state maintenance process  104  and a device state storage process  106 . CAN input message processor  102  is operable to receive input messages and parse the fields of the message to determine a message destination. The message destination specifies a software logical device to receive the message. Recall that software logical device may represent a device on a control area network or an Internet application on the Internet. Device state maintenance process  104  is operable to determine a current state of a software logical device and to determine a next state in response to the processed message. Device state storage  106  is operable to store state transition logic of each software logical device for use by device state maintenance process  104 . 
     Referring to FIG. 6, which shows a flowchart of an embodiment of a process  150  in which a command entered at a CAN user interface is delivered to a content provider on the Internet according to the present invention. A user enters data on a user interface device coupled to a control area network, as shown in block  152 . The user interface device may be a touch panel or a computer terminal with a monitor, keyboard and mouse, for example. The user may enter an alphanumeric string, click on a button icon on the screen, push a button on the touch panel, or effect any other suitable input. The data entry may require the user to also submit the entered data, such as pushing a Submit or Enter button, as shown in block  154 . The user interface device then forms a control system message incorporating the entered data and the sender and recipient of the message, as shown in block  156 . The master controller then sends the message onto the control area network, as shown in block  158 . The sender and recipient are specified by a unique combination of system ID and device ID. The recipient may be determined by the data entered by the user. For example, the user may have pushed a button associated with updating the web page of the content provider. The content provider is previously assigned a unique combination of system ID and a device ID. 
     The master controller on that network receives the message and processes the message, as shown in block  160 . An output channel state associated with the submit button of the user interface device is turned ON by the master controller to indicate that the data is being sent. The ON state of the output channel of the submit button is conveyed to the user interface, which may highlight the submit button or display a predetermined character string as a means of feedback to the user. In block  164 , the master controller then forwards the message to the protocol converter associated with the recipient software logical device in the IA server. The protocol converter then translates the message from the sender protocol to the recipient protocol, as shown in block  166 . Note that protocol conversion is not necessary or is null if the sender protocol is the same as the recipient protocol. 
     In block  168 , the translated message is then sent or otherwise conveyed to the software logical device that represents the recipient convent provider. The recipient software logical device receives the message and stores the message content in a data structure at a specific location specified by an index value, such as a number, which corresponds to the channel number of the recipient software logical device, as shown in block  170 . The stored message is accessible by specifying the index number. The software logical device then changes the state of an output channel of the same channel number to ON, as shown in block  172 . It may be noted that each device, whether physical or logical, may have one or more channels, each indicative of a specific function, parameter or property. Further, each channel may have an input and an output channel state. 
     Periodically or at its discretion, the recipient Internet application checks the output channel states of the software logical device associated therewith, as shown in block  174 . The Internet application recognizes that an output channel state is ON and therefore the data associated with that channel has been changed. In block  176 , the Internet application queries the software logical device for the data by specifying the index value. In response, the software logical device sends the message to the Internet application, as shown in block  178 . The Internet application receives the message and uses and acts according to the data in an appropriate manner. The software logical device turns OFF the input channel state, as shown in block  182 , and turns ON the output channel state of the same index value, as shown in block  184 . 
     The master controller recognizes a change in the input channel state of the software logical device representing the Internet application, as shown in block  186 . In response, the master controller turns OFF the output channel of the user interface device, which is used to notify the user that the requested action has been completed, as shown in block  188 . A change in the color or shade of the displayed button or the display of a predetermined string may be used to inform the user, as shown in block  190 . The process ends in block  192 . 
     FIG. 7 is a flowchart of an embodiment of a process  200  in which an Internet application functions as a user interface in the control system according to the teachings of the present invention. In block  202 , a user enters and submits data on an Internet application. The Internet application may be an application executing on a web server of a web content provider, a web browser, or any other suitable Internet-based application program. The Internet application may be operable to receive an alphanumeric string entered by the user, the activation of a displayed image or icon, or a combination of keystrokes entered by the user. The Internet application then requests connection to the control system by specifying an IP address and port number of the recipient software logical device, as shown in block  204 . The web server is connected with the Internet application and receives the IP message containing the entered data, as shown in block  206 . The web server then instantiates one or more processes to handle the received message, as shown in block  208 . For example, a CGI process may be provided to handle CGI scripts or an ASP process may be provided to handle ASP scripts. In the case of a web browser connecting to the web server, the instantiated process extracts data from the IP message received from the Internet application and forms a message of a protocol used by IA server  14 , such as ICSP. In the case of a content provider connecting to the web server, the message is preferably already in the form of a ICSP message transported by IP, which does not require protocol conversion. The spawned process then sends the ICSP message to the software logical device associated with the recipient device in the control system, as shown in block  210 . The recipient is identified by a system ID and a device ID. 
     The software logical device then stores the message content in an indexed position in a data structure, as shown in block  212 . The software logical device turns ON the input channel associated with the index number, as shown in block  214 . The master controller becomes aware of the input channel state change by periodically polling the channel states, as shown in block  216 . The master controller may alternatively be triggered to query the channel states by some mechanism other than time. The master controller then requests the message content at the specified index number be sent to it, as shown in block  218 . The software logical device then sends the message content to the master controller, which forwards the message content to the physical device in the control system, as shown in block  220 . The device receives the data and acts accordingly, as shown in block  222 . The master controller may also send the same data to a user interface in the control area network to update the display, as shown in block  224 . The software logical device then turns OFF the input and output channels, as shown in block  226 . The OFF states of the input and output channels notifies the Internet application, which may periodically poll the software logical device to determine the input and output channel states, that appropriate action has been taken in response to the entered data, as shown in block  228 . The process ends in block  230 . 
     It may be noted that the use of input and output channel states to notify the recipient that data is available and the sender that an action has been completed is merely provided herein as an example. Other means may be used for this function. 
     FIG. 8 illustrates a block diagram of a control system  310  in accordance with the teachings of the present invention. FIG. 8 shows an Internet web servers  312  coupled to a plurality of databases  314 . Web servers  312  are coupled to the Internet  316  via communication lines  313 . While the Internet is used as a network, the web servers could be connected to any systems or wide array networks, local area networks or Intranets. Communication lines  313  can be any direct or wireless connection. 
     Internet  316  is coupled to an Internet appliance server  320 . Internet appliance server  320  is coupled to a plurality of control area networks  322 . Each control area network has one master  324  and a variety of control area network devices  326  which can include touch panels, audio/visual equipment, and the like. Control area network devices  326  are equivalent to the Internet appliances described previously. 
     Web servers  312  are computers having a processor, such as an INTEL or Motorola processor, and memory. Web server  312  runs a web server program operable to provide web pages to a requesting user, the requesting user typically using a web browser. 
     Databases  314  are operable to store information that can be used by web servers  312  to provide content that may be required by a control area network device  326 . This can include information such as CD lists, television listings, sports data, stock information or any other type of information that may be used by control access network device  326 . 
     Internet  316  is the collection of networks located across the world interconnected for user and computer communication, including the part of the Internet known as the World Wide Web. While system  310  shows web server  312  connected to the Internet  312 , web servers  16  can be connected to any system of wide area networks, local area networks or Intranets. 
     Internet appliance server  320  is a device operable to act as a gateway between devices connected to the Internet  316  and control area network  322 . Internet appliance server  320  is, in one embodiment operable to translate messages generated by web server  317  to messages useable by control area network devices  326 . 
     In system  310 , devices  326  communicate with other devices on the same control area network  322  or different control area networks  322 . Devices  326  also receive messages generated outside the control area network  322  or generated by the master  324 . All message sent by device  326  is routed through the master  324  on the control area network  322 . 
     FIG. 9 is a block diagram providing an exemplary control area network device  326  in accordance with the teachings of the present invention. Device  326  comprises the communication line  440  coupled to a communication jack  442 , which, in one embodiment is an RJ45 jack. A message handler  444  is coupled to communication jack  442 . Message handler  444  is further coupled to one or more ports  448 . Each port  448  comprises one or more levels  450  and channels  452 . Each port  448  may be connected to an RS-232 connection  454  which in turn connects to a nine-pin connector  460  and a RS-232 IO interface  464 , for example. Each level  450  is connected to a voltage regulator  456  which in turn connects to a two-pin interface  462  and provides a voltage out  467 . Each channel  452  is connected to a relay  458  which in turn connects to a two-pin connector  461  and provides a contact out  468 . 
     In operation, messages in the first protocol, such as Phastlink+, PL+or ICSP developed by Panja, Inc. are received by a communication line  440  from a source such as a master controller  324 . Message handler  444  receives the messages. Message handler  444  is responsible for receiving the message and sending the message to the appropriate port  448 . 
     Port  448  is a control output or input on the device that is discreetly addressable. An example of a port could be an infrared generator device. There can be multiple ports in a device. Each port  448  would be numbered separately. Ports  448  can communicate with the outside world through an RS-232 interface  464 , different interfaces or no interface at all. 
     As part of a port  448 , channels  452  are provided. A channel is a part of port  448  and can take on a binary value of either on or off. In one embodiment, each port  448  can have up to 65,535 channels  452 . Channels  452  are typically connected to relays  58  which can be in an on or off condition. Relay  458  is connected to a contact out  468 , which allows on or off control of whatever port  448  is connected to. Channels  448  are bi-directional and can be input channels, output channels, or input/output channels. 
     Levels  450  are in some ways similar to channels. The main difference is that levels can take on any number of values instead of just a binary 0 or 1. Typical uses for levels include setting volume level, setting light level, etc. 
     Thus, the purpose of message in this protocol is to send and receive controls for devices, which are attached to control area network as well as send and receive status and routing information. For example, for the device shown above, a message could be sent to device  326 , which would turn on a television, set a volume level for the television, and then perhaps scroll some information across television screen. This could be accomplished by a message sent to device  326  and interpreted by message handler  444 . The message may have a command to turn the television set on and that would be sent to the channel, which would then control the relay to turn the television on. To set the volume level, the message command to set the level at a certain value is received at message handler  444 . The command goes to level  450  and then to the voltage regulator  456  which in turn would then set the level by two-pin connector  462 . The scrolling message might then go through the port  448 through the RS-232 port and displayed on the television connected to serial port DB-9 460. 
     A device can be a user interface or a controlling device, or both. User interfaces are things such as touch panels, one way wireless handheld transmitter, or custom panels. The controlling device provides the control methods for a device. For example, IR generators are controlling devices that can control a VCR, television, or other item. Each device in the system has its own unique device number, as well as port numbers and channels and levels that could be accessed. 
     FIG. 10 illustrates a block diagram of routing components of a master controller  324 . These components comprise a connection manager  530 , which provides connections between higher level managers and lower level drivers. ICSP connection manager  530  is coupled to a phastlink driver  510  via a PL to ICSP protocol conversion  522 . An AXlink driver  512  is coupled to ICSP connection manager  530  via an AXlink to ICSP protocol conversion  520 . Phastlink and Axlink are exemplary protocols used on control access networks. 
     Additionally, an RS-232 driver  514  is coupled to ICSP connection manager  530  via a PPP driver  518  coupled to a TCP/IP stack  524  and an IP port connection manager  526 . ICSP connection manager  530  is coupled to ethernet driver  516  via TCP/IP stack  524  and IP port connection manager  526 . RS-232 driver  514  provides connectivity to RS-232 devices and Ethernet driver  516  provides connectivity to devices attached to an Ethernet connection. 
     ICSP connection manager  530  is coupled to ICSP message dispatcher  532 . ICSP message dispatcher  532  can send messages to different managers including a diagnostic manager  534 , a device manager  536  or a configuration manager  538 . 
     PL to ICSP protocol conversion  522  converts from phastlink (PL) to ICSP and vice versa. In some embodiments PL to ICSP protocol conversion  522  is operable to de-multiplex incoming multiple messages into multiple messages destined for ICSP connection managers and multiple outgoing messages into a single packet for PL devices. AXlink to ICSP protocol conversion  520  converts messages between devices that use the AXlink protocol to ICSP protocol and vice versa. 
     ICSP connection manager  530  is operable to provide routing functionality. ICSP connection manager can route to local masters, local devices, remote masters and remote devices. Routing is accomplished by first routing a message to the appropriate system master and then to the correct device. The destination will be contained in the header of the packet as discussed below. 
     IP port connection manager  526  is operable to manage all IP connections, except standard Internet protocols. Standard Internet protocol  528  provides for standard protocols such as HTTP, FTP, SMNP and SMTP. 
     ICSP message dispatcher  532  determines the category of the message, such as diagnostic message, device specific messages and configuration messages and routes them to their specific message managers. These include the diagnostic manager  534 , the device manager  536 , and the configuration manager  538  and any other managers. 
     FIG. 11 is a diagram of an exemplary packet for messages in accordance to teaching the present invention. The first field is a protocol field  670 , and in one embodiment, one byte size. Protocol field identifies the format of the data section of the packet with some protocol Length of data field  672  indicates the total number of bytes in the data portion of the packet. Flag field  674  can be one of two types of flags. One is a broadcast flag. The broadcast flag will send a broadcast message to all devices on a network. A newbie flag is placed in flag field  674  when a device is added to the network. This will then cause a response from the master indicating that it received the message from the newbie device. 
     Destination system field  676  allows for the addressing of the message to reach a specific system. A system is, in one embodiment, a complete control area network with a single master. Thus, message can be directed to one of many different control area networks. In one embodiment control system field is two bytes in size. Destination device field  678  lists the number the device that the message is being sent. The device range can be anywhere between 0 and 65,535. Destination port field  680  lists the specific port of the device that the message is destined for. In one embodiment the protocol supports up to 65,535 ports on the device. 
     Source system field  682  is the number of a system where the message originates. Source device field  684  lists the device that the message originated from. If the device number is 0, this indicates that the master of that control area network is the enunciator of the communication. Source port field  686  lists the port where the message originated. 
     An important aspect of addressing is the sequencing of messages. There are certain messages and circumstances under which messages must be delivered in the order intended. This requires that each device be guaranteed the correct order for delivery. However, while messages destined for a certain device must be delivered in the order intended, out of order messages are possible when destined for different devices. 
     Allowed hop count field  688  indicates how many hops can occur before the message is purged from the system. Each time a message passes through a master, the allowed hop count field is decremented by one and checked to see if it reaches zero. Once the count reaches zero, the master generates an error message indicating that the message has not reached the sender with an air. Message I.D. field  690  contains the unique identification number for a message. This message I.D. is used by low level communication algorithms to correlate in the original message with its acknowledge and response. 
     Message command field  692  and message data  694  represent the actual message being sent in the packet. Each packet is decoded by reading the message field  692  and performing the appropriate functions. Some commands are designed for communication between a device manager located in the master and other ones are intended for communication with the connection manager located in the master. TABLE A below lists exemplary messages that are valid between a device manager and the device or master. First column lists the command, the second column lists the value of the command, the third column lists the valid response from the device for that command, and the fourth column lists the valid response for the master of that command and the fifth column lists the description of the command. For example, command input channel OFF status is sent from a device to a master, which sends the input channel off status to the master. The value of the command sent in the command value of the command field  692  is 0x0085. Because the device is sending the message there is no response for the device. The master response is 0x001, which is the command for acknowledge and the description of the command indicates that the input channel is in the off status. Thus, this command would be sent by a device after being queried by the master to say that its input channel is in the off status, or it can be sent unsolicited. The master would then send back an acknowledgment. 
     
       
         
               
               
               
               
             
               
               
               
               
               
             
           
               
                 TABLE A 
               
             
             
               
                   
               
               
                   
                   
                 Valid Response 
                   
               
               
                   
                   
                 Messages from 
               
             
          
           
               
                 Command 
                 Value 
                 DEVICE 
                 MASTER 
                 Description 
               
               
                   
               
               
                 Acknowledge 
                 0x0001 
                 None 
                 None 
                 Confirmation of message 
               
               
                   
                   
                   
                   
                 receipt. 
               
               
                 Nak 
                 0x0002 
                 None 
                 None 
                 Indicates failed 
               
               
                   
                   
                   
                   
                 delivery of a message. 
               
               
                 Input Channel ON Status 
                 0x0084 
                 Error 
                 0x0001 
                 Input channel turned ON 
               
               
                 (PUSH) 
                   
                   
                   
                 status message (PUSH). 
               
               
                 (Device-&gt;Master) 
                   
               
               
                 Input Channel OFF Status 
                 0x0085 
                 Error 
                 0x0001 
                 Input channel turned 
               
               
                 (RELEASE) 
                   
                   
                   
                 OFF status message 
               
               
                 (Device-&gt;Master) 
                   
                   
                   
                 (RELEASE) 
               
               
                 Output Channel ON 
                 0x0006 
                 0x0086, 
                 0x0086 
                 Output turn ON message. 
               
               
                 (Master-&gt;Device) 
                   
                 0x0088, 
                   
                 If device does not 
               
               
                   
                   
                 or 
                   
                 support channels, then 
               
               
                   
                   
                 0x0001 
                   
                 message is only ACKed. 
               
               
                 Output Channel ON Status 
                 0x0086 
                 Error 
                 0x0001 
                 Output turned ON status 
               
               
                 (Device-&gt;Master) 
                   
                   
                   
                 message. 
               
               
                 Output Channel OFF 
                 0x0007 
                 0x0087, 
                 0x0087 
                 Output turn OFF 
               
               
                 (Master-&gt;Device) 
                   
                 0x0089, 
                   
                 message. If device does 
               
               
                   
                   
                 or 
                   
                 not support channels, 
               
               
                   
                   
                 0x0001 
                   
                 then message is only 
               
               
                   
                   
                   
                   
                 ACKed. 
               
               
                 Output Channel OFF 
                 0x0087 
                 Error 
                 0x0001 
                 Output turned OFF 
               
               
                 Status 
                   
                   
                   
                 status message. 
               
               
                 (Device-&gt;Master) 
               
               
                 Input/Output Channel 
                 0x0088 
                 Error 
                 0x0001 
                 Input and Output 
               
               
                 ON Status 
                   
                   
                   
                 channel turned ON 
               
               
                 (Device-&gt;Master) 
                   
                   
                   
                 message. 
               
               
                 Input/Output Channel 
                 0x0089 
                 Error 
                 0x0001 
                 Input and Output 
               
               
                 OFF Status 
                   
                   
                   
                 channel turned OFF 
               
               
                 (Device-&gt;Master) 
                   
                   
                   
                 status message. 
               
               
                 Feedback Channel ON 
                 0x0018 
                 N/A 
                 N/A 
                 Indicates the feedback 
               
               
                   
                   
                   
                   
                 state the master is 
               
               
                   
                   
                   
                   
                 maintaining. Only 
               
               
                   
                   
                   
                   
                 generated for 
               
               
                   
                   
                   
                   
                 Diagnostic purposes. 
               
               
                 Feedback Channel OFF 
                 0x0019 
                 N/A 
                 N/A 
                 Indicates the feedback 
               
               
                   
                   
                   
                   
                 state the master is 
               
               
                   
                   
                   
                   
                 maintaining. Only 
               
               
                   
                   
                   
                   
                 generated for 
               
               
                   
                   
                   
                   
                 Diagnostic purposes. 
               
               
                 Level Value 
                 0x000A 
                 0x008A 
                 0x008A 
                 A level value changed. 
               
               
                 (Master-&gt;Device) 
                   
                 or 
                   
                 If device does not 
               
               
                   
                   
                 0x0001 
                   
                 support levels, then 
               
               
                   
                   
                   
                   
                 message is only ACKed. 
               
               
                 Level Value 
                 0x008A 
                 Error 
                 0x0001 
                 A level value changed. 
               
               
                 (Device-&gt;Master) 
               
               
                 String 
                 0x000B 
                 0x0001 
                 0x0001 
                 Used to transfer a 
               
               
                 (Master-&gt;Device) 
                   
                   
                   
                 “String”. 
               
               
                 String 
                 0x008B 
                 Error 
                 0x0001 
                 Used to transfer a 
               
               
                 (Device-&gt;Master) 
                   
                   
                   
                 “String”. 
               
               
                 Command 
                 0x000C 
                 0x0001 
                 0x0001 
                 Used to transfer a 
               
               
                 (Master-&gt;Device) 
                   
                   
                   
                 “Command”. 
               
               
                 Command 
                 0x008C 
                 Error 
                 0x0001 
                 Used to transfer a 
               
               
                 (Device-&gt;Master) 
                   
                   
                   
                 “Command”. 
               
               
                 Request Level Value 
                 0x000E 
                 Error 
                 0x008A 
                 Requests the status of 
               
               
                 (Master-&gt;Master) 
                   
                   
                 or 
                 specified level value. 
               
               
                   
                   
                   
                 0x0001 
                 If the level does not 
               
               
                   
                   
                   
                   
                 exist, the response 
               
               
                   
                   
                   
                   
                 message is ACK. 
               
               
                 Request Output Channel 
                 0x000F 
                 Error 
                 0x0086, 
                 Requests the status of 
               
               
                 Status 
                   
                   
                 0x0087, 
                 specified Output 
               
               
                 (Master-&gt;Master) 
                   
                   
                 or 
                 channel or ALL Output 
               
               
                   
                   
                   
                 0x0001 
                 channels that are ON 
               
               
                   
                   
                   
                   
                 (if channel = 0). If 
               
               
                   
                   
                   
                   
                 the request i{grave over (s)} for all 
               
               
                   
                   
                   
                   
                 channels and none are 
               
               
                   
                   
                   
                   
                 on then response is 
               
               
                   
                   
                   
                   
                 ACK. 
               
               
                 Request Port Count 
                 0x0010 
                 Error 
                 0x0090 
                 Request number of ports 
               
               
                 (Master-&gt;Master) 
                   
                   
                   
                 used by device. 
               
               
                   
                   
                   
                   
                 Assumed 1 if no 
               
               
                   
                   
                   
                   
                 response. 
               
               
                 Port Count 
                 0x0090 
                 Error 
                 0x0001 
                 Number of ports used by 
               
               
                 (Device-&gt;Master) 
                   
                   
                   
                 device. Sent upon 
               
               
                 (Master-&gt;Master) 
                   
                   
                   
                 reporting by a device 
               
               
                   
                   
                   
                   
                 if it has more than one 
               
               
                   
                   
                   
                   
                 Port. Sent by a master 
               
               
                   
                   
                   
                   
                 as a response to 
               
               
                   
                   
                   
                   
                 Request Port Count. 
               
               
                 Request Output Channel 
                 0x0011 
                 Error 
                 0x0091 
                 Request number of 
               
               
                 Count 
                   
                   
                   
                 output channels used by 
               
               
                 (Master-&gt;Master) 
                   
                   
                   
                 specified port on 
               
               
                   
                   
                   
                   
                 device. Assumes 
               
               
                   
                   
                   
                   
                 256/port if no 
               
               
                   
                   
                   
                   
                 response. 
               
               
                 Output Channel Count 
                 0x0091 
                 Error 
                 0x0001 
                 Number of channels used 
               
               
                 (Device-&gt;Master) 
                   
                   
                   
                 by specified port. Sent 
               
               
                 (Master-&gt;Master) 
                   
                   
                   
                 upon reporting by a 
               
               
                   
                   
                   
                   
                 device/port if it has 
               
               
                   
                   
                   
                   
                 more than 256 channels. 
               
               
                   
                   
                   
                   
                 Sent by a master as a 
               
               
                   
                   
                   
                   
                 response to Request 
               
               
                   
                   
                   
                   
                 Output Channel Count. 
               
               
                 Request Level Count 
                 0x0012 
                 Error 
                 0x0092 
                 Request number of 
               
               
                 (Master-&gt;Master) 
                   
                   
                   
                 levels used by 
               
               
                   
                   
                   
                   
                 specified port. 
               
               
                   
                   
                   
                   
                 Assumes 8/port if no 
               
               
                   
                   
                   
                   
                 response. 
               
               
                 Level Count 
                 0x0092 
                 Error 
                 0x0001 
                 Number of levels used 
               
               
                 (Device-&gt;Master) 
                   
                   
                   
                 by specified port. Sent 
               
               
                 (Master-&gt;Master) 
                   
                   
                   
                 upon reporting by a 
               
               
                   
                   
                   
                   
                 device/port if it has 
               
               
                   
                   
                   
                   
                 more than 8 levels. 
               
               
                   
                   
                   
                   
                 Sent by a master as a 
               
               
                   
                   
                   
                   
                 response to Request 
               
               
                   
                   
                   
                   
                 Level Count. 
               
               
                 Request String Size 
                 0x0013 
                 Error 
                 0x0093 
                 Request number of bytes 
               
               
                 (Master-&gt;Master) 
                   
                   
                   
                 supported by 
               
               
                   
                   
                   
                   
                 device/port for a 
               
               
                   
                   
                   
                   
                 single SEND_STRING. 
               
               
                   
                   
                   
                   
                 Assume 64 bytes if no 
               
               
                   
                   
                   
                   
                 response. 
               
               
                 String Size 
                 0x0093 
                 Error 
                 0x0001 
                 Number of bytes/string 
               
               
                 (Device-&gt;Master) 
                   
                   
                   
                 supported by device. 
               
               
                 (Master-&gt;Master) 
                   
                   
                   
                 Sent upon reporting by 
               
               
                   
                   
                   
                   
                 a device/port if it 
               
               
                   
                   
                   
                   
                 supports than 64 byte 
               
               
                   
                   
                   
                   
                 strings. Sent by a 
               
               
                   
                   
                   
                   
                 master as a response to 
               
               
                   
                   
                   
                   
                 Request String Size. 
               
               
                 Request Command Size 
                 0x0014 
                 Error 
                 0x0094 
                 Request number of bytes 
               
               
                 (Master-&gt;Master) 
                   
                   
                   
                 supported by 
               
               
                   
                   
                   
                   
                 device/port for a 
               
               
                   
                   
                   
                   
                 single SEND_COMMAND. 
               
               
                   
                   
                   
                   
                 Assume 64 bytes if no 
               
               
                   
                   
                   
                   
                 response. 
               
               
                 Command Size 
                 0x0094 
                 Error 
                 0x0001 
                 Number of bytes/command 
               
               
                 (Device-&gt;Master) 
                   
                   
                   
                 supported by device. 
               
               
                 (Master-&gt;Master) 
                   
                   
                   
                 Sent upon reporting by 
               
               
                   
                   
                   
                   
                 a device/port if it 
               
               
                   
                   
                   
                   
                 supports than 64 byte 
               
               
                   
                   
                   
                   
                 commands. Sent by a 
               
               
                   
                   
                   
                   
                 master as a response to 
               
               
                   
                   
                   
                   
                 Request Command Size. 
               
               
                 Request Level Size 
                 0x0015 
                 Error 
                 0x0095 
                 Requests the data types 
               
               
                 (Master-&gt;Master) 
                   
                   
                   
                 supported by a level. 
               
               
                   
                   
                   
                   
                 Assume BYTE (Type 0x10) 
               
               
                   
                   
                   
                   
                 if no response. 
               
               
                 Level Size 
                 0x0095 
                 Error 
                 0x0001 
                 Highest data type 
               
               
                 (Device-&gt;Master) 
                   
                   
                   
                 supported for a level. 
               
               
                 (Master-&gt;Master) 
                   
                   
                   
                 Sent upon reporting by 
               
               
                   
                   
                   
                   
                 a device if it supports 
               
               
                   
                   
                   
                   
                 more than BYTE (Type 
               
               
                   
                   
                   
                   
                 0x10) data types. Sent 
               
               
                   
                   
                   
                   
                 by a master as a 
               
               
                   
                   
                   
                   
                 response to Request 
               
               
                   
                   
                   
                   
                 Level Size. 
               
               
                 Request Status 
                 0x0016 
                 Error 
                 0x0096 
                 Request status of the 
               
               
                 (Master-&gt;Master) 
                   
                   
                   
                 device and or Port. 
               
               
                 Status 
                 0x0096 
                 Error 
                 0x0001 
                 Sent by device to 
               
               
                 (Device-&gt;Master) 
                   
                   
                   
                 update master of 
               
               
                 (Master-&gt;Master) 
                   
                   
                   
                 Status. Sent by master 
               
               
                   
                   
                   
                   
                 as a response to 
               
               
                   
                   
                   
                   
                 Request Status. 
               
               
                 Request Device Info 
                 0x0017 
                 0x0097 
                 0x0097 
                 Type of device, 
               
               
                 (Master-&gt;Device) 
                   
                   
                   
                 version, etc including 
               
               
                   
                   
                   
                   
                 sub-devices. 
               
               
                 Device Info 
                 0x0097 
                 Error 
                 0x0001 
                 Response to above. 
               
               
                 (Device-&gt;Master) 
               
               
                 Device Info EOT 
                 0x0098 
                 None 
                 None 
                 Indicates that all 
               
               
                 (Master-&gt;Device) 
                   
                   
                   
                 previously requested 
               
               
                   
                   
                   
                   
                 Device Info has been 
               
               
                   
                   
                   
                   
                 transferred. 
               
               
                 Request Master Status 
                 0x00A1 
                 Error 
                 0x0021 
                 Request the status of a 
               
               
                 (Device-&gt;Master) 
                   
                   
                   
                 system master. 
               
               
                 (Master-&gt;Master) 
               
               
                 Master Status 
                 0x0021 
                 0x0001 
                 0x0001 
                 Master status. Used to 
               
               
                 (Master-&gt;Device) 
                   
                   
                   
                 indicate various states 
               
               
                 (Master-&gt;Master) 
                   
                   
                   
                 of a Master. 
               
               
                   
               
             
          
         
       
     
     The “Value” field from TABLE A is placed in the “MC” (MessageCommand) field of the packet. Any Message Data required is placed in the variable length “MD” (MessageData) field. 
     The following is a more detailed description of exemplary commands. 
     Acknowledge 
     This message is generated by the master or device to confirm receipt of a message sent. The MessageID field must match the original message&#39;s MessageID and the Response bit should be set. 
     Message and Parameters 
     
       
         
               
               
               
               
             
           
               
                   
                   
               
               
                   
                 Field 
                 Value(s) 
                 Description 
               
               
                   
                   
               
             
             
               
                   
                 MC 
                 0x0001 
                 Acknowledge Value 
               
               
                   
                 MD 
                 &lt;None&gt; 
                 Nothing 
               
               
                   
                   
               
             
          
         
       
     
     Nak 
     This message is generated by the master when the destination system/device for the message does not exist. This message indicates that a previous message was not routable by the master. The MessageID field must match the original message&#39;s MessageID and the Response bit should be set. 
     Message and Parameters 
     
       
         
               
               
               
               
             
           
               
                   
                   
               
               
                   
                 Field 
                 Value(s) 
                 Description 
               
               
                   
                   
               
             
             
               
                   
                 MC 
                 0x0002 
                 Nak Value 
               
               
                   
                 MD 
                 &lt;None&gt; 
                 Nothing 
               
               
                   
                   
               
             
          
         
       
     
     Input Channel ON Status (Device→Master) 
     The Input Channel ON message is generated when a button is PUSHed or Input channel is turned ON from a device/port or a master. 
     Message and Parameters 
     
       
         
               
               
               
               
             
           
               
                   
                   
               
               
                   
                 Field 
                 Value(s) 
                 Description 
               
               
                   
                   
               
             
             
               
                   
                 MC 
                 0x0084 
                 Input Channel ON Value 
               
               
                   
                 MD[1 . . . 2] 
                 Device 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[3 . . . 4] 
                 Port 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[5 . . . 6] 
                 System 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[7 . . . 8] 
                 Channel 
                 Unsigned 16-bit value. 
               
               
                   
                   
               
             
          
         
       
     
     Input Channel OFF Status (Device→Master) 
     The Input Channel OFF message is generated when a button is RELEASEd or Input channel is turned OFF from a device/port or a master. 
     Message and Parameters: 
     
       
         
               
               
               
               
             
           
               
                   
                   
               
               
                   
                 Field 
                 Value(s) 
                 Description 
               
               
                   
                   
               
             
             
               
                   
                 MC 
                 0x0085 
                 Input Channel OFF Value 
               
               
                   
                 MD[1 . . . 2] 
                 Device 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[3 . . . 4] 
                 Port 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[5 . . . 6] 
                 System 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[7 . . . 8] 
                 Channel 
                 Unsigned 16-bit value. 
               
               
                   
                   
               
             
          
         
       
     
     Output Channel ON (Master→Device) 
     The Output Channel ON message is generated when an Output channel is turned ON from a master. 
     Message and Parameters 
     
       
         
               
               
               
               
             
           
               
                   
                   
               
               
                   
                 Field 
                 Value(s) 
                 Description 
               
               
                   
                   
               
             
             
               
                   
                 MC 
                 0x0006 
                 Output Channel ON Value 
               
               
                   
                 MD[1 . . . 2] 
                 Device 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[3 . . . 4] 
                 Port 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[5 . . . 6] 
                 System 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[7 . . . 8] 
                 Channel 
                 Unsigned 16-bit value. 
               
               
                   
                   
               
             
          
         
       
     
     Output Channel ON Status (Device→Master) 
     The Output Channel ON Status message is generated when an Output channel is turned ON from a device/port. Note that when the master turns a channel ON, it assumes the channel is ON. Therefore, the device should not send this message in response to the channel being turned ON by the master. 
     Internally, this triggers an output event to occur in the Axcess language. 
     Message and Parameters 
     
       
         
               
               
               
               
             
           
               
                   
                   
               
               
                   
                 Field 
                 Value(s) 
                 Description 
               
               
                   
                   
               
             
             
               
                   
                 MC 
                 0x0086 
                 Output Channel ON Status Value 
               
               
                   
                 MD[1 . . . 2] 
                 Device 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[3 . . . 4] 
                 Port 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[5 . . . 6] 
                 System 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[7 . . . 8] 
                 Channel 
                 Unsigned 16-bit value. 
               
               
                   
                   
               
             
          
         
       
     
     Output Channel OFF (Master→Device) 
     The Output Channel OFF message is generated when an Output channel is turned OFF from a master. 
     Message and Parameters 
     
       
         
               
               
               
               
             
           
               
                   
                   
               
               
                   
                 Field 
                 Value(s) 
                 Description 
               
               
                   
                   
               
             
             
               
                   
                 MC 
                 0x0007 
                 Output Channel OFF Value 
               
               
                   
                 MD[1 . . . 2] 
                 Device 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[3 . . . 4] 
                 Port 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[5 . . . 6] 
                 System 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[7 . . . 8] 
                 Channel 
                 Unsigned 16-bit value. 
               
               
                   
                   
               
             
          
         
       
     
     Output Channel OFF Status (Device→Master) 
     The Output Channel OFF Status message is generated when an Output channel is turned OFF from a device/port. Note that when the master turns a channel OFF, it assumes the channel is OFF. Therefore, the device should not send this message in response to the channel being turned OFF by the master. 
     Internally, this triggers an output event to occur in the Axcess language. 
     Message and Parameters 
     
       
         
               
               
               
               
             
           
               
                   
                   
               
               
                   
                 Field 
                 Value(s) 
                 Description 
               
               
                   
                   
               
             
             
               
                   
                 MC 
                 0x0087 
                 Output Channel OFF Status Value 
               
               
                   
                 MD[1 . . . 2] 
                 Device 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[3 . . . 4] 
                 Port 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[5 . . . 6] 
                 System 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[7 . . . 8] 
                 Channel 
                 Unsigned 16-bit value. 
               
               
                   
                   
               
             
          
         
       
     
     Input/Output Channel ON Status (Device→Master) 
     The Input/Output Channel ON Status message is generated when an Input/Output channel is turned ON from a device/port. 
     Message and Parameters 
     
       
         
               
               
               
             
           
               
                   
               
               
                 Field 
                 Value(s) 
                 Description 
               
               
                   
               
             
             
               
                 MC 
                 0x0088 
                 Input/Output Channel ON Status Value 
               
               
                 MD[1 . . . 2] 
                 Device 
                 Unsigned 16-bit value. 
               
               
                 MD[3 . . . 4] 
                 Port 
                 Unsigned 16-bit value. 
               
               
                 MD[5 . . . 6] 
                 System 
                 Unsigned 16-bit value. 
               
               
                 MD[7 . . . 8] 
                 Channel 
                 Unsigned 16-bit value. 
               
               
                   
               
             
          
         
       
     
     Input/Output Channel OFF Status (Device→Master) 
     The Input/Output Channel OFF Status message is generated when an Input/Output channel is turned OFF from a device/port. 
     Message and Parameters 
     
       
         
               
               
               
             
           
               
                   
               
               
                 Field 
                 Value(s) 
                 Description 
               
               
                   
               
             
             
               
                 MC 
                 0x0089 
                 Input/Output Channel OFF Status Value 
               
               
                 MD[1 . . . 2] 
                 Device 
                 Unsigned 16-bit value. 
               
               
                 MD[3 . . . 4] 
                 Port 
                 Unsigned 16-bit value. 
               
               
                 MD[5 . . . 6] 
                 System 
                 Unsigned 16-bit value. 
               
               
                 MD[7 . . . 8] 
                 Channel 
                 Unsigned 16-bit value. 
               
               
                   
               
             
          
         
       
     
     Feedback Channel ON 
     The Feedback Channel ON message is generated for diagnostic purposes only. See the Diagnostic Manager specification for more information. 
     Message and parameters 
     
       
         
               
               
               
               
             
           
               
                   
                   
               
               
                   
                 Field 
                 Value(s) 
                 Description 
               
               
                   
                   
               
             
             
               
                   
                 MC 
                 0x0018 
                 Feedback Channel ON 
               
               
                   
                 MD[1 . . . 2] 
                 Device 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[3 . . . 4] 
                 Port 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[5 . . . 6] 
                 System 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[7 . . . 8] 
                 Channel 
                 Unsigned 16-bit value. 
               
               
                   
                   
               
             
          
         
       
     
     Feedback Channel OFF 
     The Feedback Channel OFF message is generated for diagnostic purposes only. See the Diagnostic Manager specification for more information. 
     Message and Parameters 
     
       
         
               
               
               
               
             
           
               
                   
                   
               
               
                   
                 Field 
                 Value(s) 
                 Description 
               
               
                   
                   
               
             
             
               
                   
                 MC 
                 0x0019 
                 Feedback Channel OFF 
               
               
                   
                 MD[1 . . . 2] 
                 Device 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[3 . . . 4] 
                 Port 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[5 . . . 6] 
                 System 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[7 . . . 8] 
                 Channel 
                 Unsigned 16-bit value. 
               
               
                   
                   
               
             
          
         
       
     
     Level Value (Master→Device) 
     This message is used to force a level value change from the master. 
     Message and Parameters 
     
       
         
               
               
               
               
             
           
               
                   
                   
               
               
                   
                 Field 
                 Value(s) 
                 Description 
               
               
                   
                   
               
             
             
               
                   
                 MC 
                 0x000A 
                 Level Value Change 
               
               
                   
                 MD[1 . . . 2] 
                 Device 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[3 . . . 4] 
                 Port 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[5 . . . 6] 
                 System 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[7 . . . 8] 
                 Level 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[9] 
                 ValueType 
                 Unsigned 8-bit value. 
               
               
                   
                   
                 Specifier 
               
               
                   
                 MD[10 . . . n] 
                 Value 
                 Dynamically sized. 
               
               
                   
                   
                   
                 Size indicated by 
               
               
                   
                   
                   
                 MD[9]. 
               
               
                   
                   
               
             
          
         
       
     
     The Value Type Specifier field specifies how the following data (MD[10. . n]) is interpreted. The table below indicates the values of MD[9] as they correlate to data types. 
     ValueType Specifiers 
     
       
         
               
               
               
               
             
           
               
                   
                   
               
               
                   
                 Type 
                 Specifier 
                 # of Bytes 
               
               
                   
                   
               
             
             
               
                   
                 BYTE 
                 0x10 
                 1 
               
               
                   
                 CHAR 
                 0x11 
                 1 
               
               
                   
                 WIDECHAR 
                 0x20 
                 2 
               
               
                   
                 INTEGER 
                 0x20 
                 2 
               
               
                   
                 SINTEGER 
                 0x21 
                 2 
               
               
                   
                 ULONG 
                 0x40 
                 4 
               
               
                   
                 LONG 
                 0x41 
                 4 
               
               
                   
                 FLOAT 
                 0x4F 
                 4 
               
               
                   
                 DOUBLE 
                 0x8F 
                 8 
               
               
                   
                   
               
             
          
         
       
     
     The LevelType command is used to query a device to determine the dynamic range supported by the device. This information is then used to generate messages appropriate to the device. 
     Level Value (Device→Master) 
     This message is used to indicate, to the master, that a device/port/level value has changed. 
     Message and Parameters 
     
       
         
               
               
               
             
           
               
                   
               
               
                 Field 
                 Value(s) 
                 Description 
               
               
                   
               
             
             
               
                 MC 
                 0x008A 
                 Level Value Change 
               
               
                 MD[1 . . . 2] 
                 Device 
                 Unsigned 16-bit value. 
               
               
                 MD[3 . . . 4] 
                 Port 
                 Unsigned 16-bit value. 
               
               
                 MD[5 . . . 6] 
                 System 
                 Unsigned 16-bit value. 
               
               
                 MD[7 . . . 8] 
                 Level 
                 Unsigned 16-bit value. 
               
               
                 MD[9] 
                 ValueType 
                 Unsigned 8-bit value. Reference 
               
               
                   
                 Specifier 
                 2.2.5.3.13 Level Value (Master-&gt;Device) 
               
               
                   
                   
                 for an explanation of this and the next 
               
               
                   
                   
                 field. 
               
               
                 MD[10 . . . n] 
                 Value 
                 Dynamically sized. Size indicated by 
               
               
                   
                   
                 MD[9]. 
               
               
                   
               
             
          
         
       
     
     String (Master→Device) 
     The String message is generated by the master to communicate a String. The format of a String is similar to a “C Language” string, however, the semantics are different. A String in a control system context is used to generate a “control” message. This “control” message could cause a laser disc player to begin playing a disc, display a message to the user of the system, or any number of any other uses. The string will be converted, as necessary, to any format that the device supports as determined by the StringSize message. 
     Message and Parameters 
     
       
         
               
               
               
               
             
           
               
                   
                   
               
               
                   
                 Field 
                 Value(s) 
                 Description 
               
               
                   
                   
               
             
             
               
                   
                 MC 
                 0x000B 
                 String Value 
               
               
                   
                 MD[1 . . . 2] 
                 Device 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[3 . . . 4] 
                 Port 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[5 . . . 6] 
                 System 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[7] 
                 ValueType 
                 Unsigned 8-bit value. 
               
               
                   
                   
                 Specifier 
               
               
                   
                 MD[8 . . . 9] 
                 Length 
                 Unsigned 16-bit value. Number of 
               
               
                   
                   
                   
                 characters in string (i.e. number of 
               
               
                   
                   
                   
                 elements, this is not the number of 
               
               
                   
                   
                   
                 bytes) 
               
               
                   
                 MD[10 . . . n] 
                 String 
                 Length characters. (n or n*2 bytes) 
               
               
                   
                   
               
             
          
         
       
     
     String ValueType Specifiers 
     
       
         
               
               
               
               
               
             
           
               
                   
               
               
                 Keyword 
                 Data 
                 Type 
                   
                   
               
               
                 Type 
                 Type 
                 Specifier 
                 Size 
                 Range 
               
               
                   
               
             
             
               
                 CHAR 
                 “Normal” 
                 0x01 
                  8-bit 
                 Variable length strings 
               
               
                 Arrays 
                 String 
                   
                   
                 (i.e. an array of 
               
               
                   
                   
                   
                   
                 characters) 
               
               
                 WIDECHAR 
                 “Unicode” 
                 0x02 
                 16-bit 
                 Variable length strings 
               
               
                 Arrays 
                 String 
                   
                   
                 (i.e. an array of WIDE 
               
               
                   
                   
                   
                   
                 characters) 
               
               
                   
               
             
          
         
       
     
     String (Device→Master) 
     The String message is generated by a device, sent to the master, to communicate a String. 
     Message and Parameters 
     
       
         
               
               
               
               
             
           
               
                   
                   
               
               
                   
                 Field 
                 Value(s) 
                 Description 
               
               
                   
                   
               
             
             
               
                   
                 MC 
                 0x008B 
                 String Value 
               
               
                   
                 MD[1 . . . 2] 
                 Device 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[3 . . . 4] 
                 Port 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[5 . . . 6] 
                 System 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[7] 
                 ValueType 
                 Unsigned 8-bit value. 
               
               
                   
                   
                 Specifier 
               
               
                   
                 MD[8 . . . 9] 
                 Length 
                 Unsigned 16-bit value. Number of 
               
               
                   
                   
                   
                 characters in string (i.e. number of 
               
               
                   
                   
                   
                 elements, this is not the number of 
               
               
                   
                   
                   
                 bytes) 
               
               
                   
                 MD[10 . . . n] 
                 String 
                 Length characters. (n or n*2 bytes) 
               
               
                   
                   
               
             
          
         
       
     
     String ValueType Specifiers 
     
       
         
               
               
               
               
               
             
           
               
                   
               
               
                 Keyword 
                 Data 
                 Type 
                   
                   
               
               
                 Type 
                 Type 
                 Specifier 
                 Size 
                 Range 
               
               
                   
               
             
             
               
                 CHAR 
                 “Normal” 
                 0x01 
                  8-bit 
                 Variable length strings 
               
               
                 Arrays 
                 String 
                   
                   
                 (i.e. an array of 
               
               
                   
                   
                   
                   
                 characters) 
               
               
                 WIDECHAR 
                 “Unicode” 
                 0x02 
                 16-bit 
                 Variable length strings 
               
               
                 Arrays 
                 String 
                   
                   
                 (i.e. an array of WIDE 
               
               
                   
                   
                   
                   
                 characters) 
               
               
                   
               
             
          
         
       
     
     Command (Master→Device) 
     The Command message is generated by the master to communicate a command string. The format of a Command is similar to a “C Language” string, however, the semantics are different. A Command in a control system context is used to generate a “control” message. This “control” message is generally intended to “command” the controlling device, not the controlled device. For example, a command to an RS232 port might enable XON/XOFF flow control. This command affected the controlling device, but not the controlled device. 
     Message and Parameters 
     
       
         
               
               
               
               
             
           
               
                   
                   
               
               
                   
                 Field 
                 Value(s) 
                 Description 
               
               
                   
                   
               
             
             
               
                   
                 MC 
                 0x000C 
                 Command Value 
               
               
                   
                 MD[1 . . . 2] 
                 Device 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[3 . . . 4] 
                 Port 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[5 . . . 6] 
                 System 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[7] 
                 ValueType 
                 Unsigned 8-bit value. 
               
               
                   
                   
                 Specifier 
               
               
                   
                 MD[8 . . . 9] 
                 Length 
                 Unsigned 16-bit value. Number of 
               
               
                   
                   
                   
                 characters in string (i.e. number of 
               
               
                   
                   
                   
                 elements, this is not the number of 
               
               
                   
                   
                   
                 bytes) 
               
               
                   
                 MD[10 . . . n] 
                 Command 
                 Length characters. (n or n*2 bytes) 
               
               
                   
                   
               
             
          
         
       
     
     Command ValueType Specifiers 
     
       
         
               
               
               
               
               
             
           
               
                   
               
               
                 Keyword 
                 Data 
                 Type 
                   
                   
               
               
                 Type 
                 Type 
                 Specifier 
                 Size 
                 Range 
               
               
                   
               
             
             
               
                 CHAR 
                 “Normal” 
                 0x01 
                  8-bit 
                 Variable length strings 
               
               
                 Arrays 
                 String 
                   
                   
                 (i.e. an array of 
               
               
                   
                   
                   
                   
                 characters) 
               
               
                 WIDECHAR 
                 “Unicode” 
                 0x02 
                 16-bit 
                 Variable length strings 
               
               
                 Arrays 
                 String 
                   
                   
                 (i.e. an array of WIDE 
               
               
                   
                   
                   
                   
                 characters) 
               
               
                   
               
             
          
         
       
     
     Command (Device→Master) 
     The Command message is generated by a device, sent to the master, to communicate a Command string. 
     Message and Parameters 
     
       
         
               
               
               
               
             
           
               
                   
                   
               
               
                   
                 Field 
                 Value(s) 
                 Description 
               
               
                   
                   
               
             
             
               
                   
                 MC 
                 0x008C 
                 Command Value 
               
               
                   
                 MD[1 . . . 2] 
                 Device 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[3 . . . 4] 
                 Port 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[5 . . . 6] 
                 System 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[7] 
                 ValueType 
                 Unsigned 8-bit value. 
               
               
                   
                   
                 Specifier 
               
               
                   
                 MD[8 . . . 9] 
                 Length 
                 Unsigned 16-bit value. Number of 
               
               
                   
                   
                   
                 characters in string (i.e. number of 
               
               
                   
                   
                   
                 elements, this is not the number of 
               
               
                   
                   
                   
                 bytes) 
               
               
                   
                 MD[10 . . . n] 
                 Command 
                 Length characters. (n or n*2 bytes) 
               
               
                   
                   
               
             
          
         
       
     
     Command ValueType Specifiers 
     
       
         
               
               
               
               
               
             
           
               
                   
               
               
                 Keyword 
                 Data 
                 Type 
                   
                   
               
               
                 Type 
                 Type 
                 Specifier 
                 Size 
                 Range 
               
               
                   
               
             
             
               
                 CHAR 
                 “Normal” 
                 0x01 
                  8-bit 
                 Variable length strings 
               
               
                 Arrays 
                 String 
                   
                   
                 (i.e. an array of 
               
               
                   
                   
                   
                   
                 characters) 
               
               
                 WIDECHAR 
                 “Unicode” 
                 0x02 
                 16-bit 
                 Variable length strings 
               
               
                 Arrays 
                 String 
                   
                   
                 (i.e. an array of WIDE 
               
               
                   
                   
                   
                   
                 characters) 
               
               
                   
               
             
          
         
       
     
     Request Level Value (Master→Master) 
     The Request Level Value message is generated by the master to request the level value of a level. 
     Message and Parameters 
     
       
         
               
               
               
               
             
           
               
                   
                   
               
               
                   
                 Field 
                 Value(s) 
                 Description 
               
               
                   
                   
               
             
             
               
                   
                 MC 
                 0x000E 
                 Request Level Value 
               
               
                   
                 MD[1 . . . 2] 
                 Device 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[3 . . . 4] 
                 Port 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[5 . . . 6] 
                 System 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[7 . . . 8] 
                 Level 
                 Unsigned 16-bit value. 
               
               
                   
                   
               
             
          
         
       
     
     Request Output Channel Status (Master→Master) 
     The Request Output Channel Status message is generated by the master to request the status of a single Output Channel or status of all Output Channels. 
     Message and Parameters 
     
       
         
               
               
               
               
             
           
               
                   
                   
               
               
                   
                 Field 
                 Value(s) 
                 Description 
               
               
                   
                   
               
             
             
               
                   
                 MC 
                 0x000F 
                 Request Output Channel Status Value 
               
               
                   
                 MD[1 . . . 2] 
                 Device 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[3 . . . 4] 
                 Port 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[5 . . . 6] 
                 System 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[7 . . . 8] 
                 Channel 
                 Unsigned 16-bit value. 
               
               
                   
                   
                   
                 If zero then the request 
               
               
                   
                   
                   
                 is for a status update for all 
               
               
                   
                   
                   
                 channels on the specified port. 
               
               
                   
                   
               
             
          
         
       
     
     Request Port Count (Master→Master) 
     This message requests, from the destination device, the number of ports supported by the device. The initial assumption that the master makes is that each device in the system has one port. If the device does not respond, the master assumes that it has one port. 
     Message and Parameters 
     
       
         
               
               
               
               
             
           
               
                   
                   
               
               
                   
                 Field 
                 Value(s) 
                 Description 
               
               
                   
                   
               
             
             
               
                   
                 MC 
                 0x0010 
                 Request Fort Count Value 
               
               
                   
                 MD[1 . . . 2] 
                 Device 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[3 . . . 4] 
                 System 
                 Unsigned 16-bit value. 
               
               
                   
                   
               
             
          
         
       
     
     Port Count (Device→Master, Master→Master) 
     This message is the response from a master to the Request Port Count message above. It is sent by a device upon reporting if the device has more than one port. 
     Message and Parameters 
     
       
         
               
               
               
               
             
           
               
                   
                   
               
               
                   
                 Field 
                 Value(s) 
                 Description 
               
               
                   
                   
               
             
             
               
                   
                 MC 
                 0x0090 
                 Port Count Value 
               
               
                   
                 MD[1 . . . 2] 
                 Device 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[3 . . . 4] 
                 System 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[5 . . . 6] 
                 Port Count 
                 Unsigned 16-bit value. 
               
               
                   
                   
               
             
          
         
       
     
     Request Output Channel Count (Master→Master) 
     This message requests from the destination device, the number of output channel supported by the specified device/port. The initial assumption that the master makes is that each device/port in the system has 256 channels. 
     Message and Parameters 
     
       
         
               
               
               
               
             
           
               
                   
                   
               
               
                   
                 Field 
                 Value(s) 
                 Description 
               
               
                   
                   
               
             
             
               
                   
                 MC 
                 0x0011 
                 Request Output Channel Count Value 
               
               
                   
                 MD[1 . . . 2] 
                 Device 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[3 . . . 4] 
                 Port 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[5 . . . 6] 
                 System 
                 Unsigned 16-bit value. 
               
               
                   
                   
               
             
          
         
       
     
     Output Channel Count (Device→Master, Master→Master) 
     This message is the response from a master to the Request Output Channel Count message above. It is sent by a device/port upon reporting if the device has more than 256 channels. 
     Message and Parameters 
     
       
         
               
               
               
               
             
           
               
                   
                   
               
               
                   
                 Field 
                 Value(s) 
                 Description 
               
               
                   
                   
               
             
             
               
                   
                 MC 
                 0x0091 
                 Output Channel Count Value 
               
               
                   
                 MD[1 . . . 2] 
                 Device 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[3 . . . 4] 
                 Port 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[5 . . . 6] 
                 System 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[7 . . . 8] 
                 Output 
                 Unsigned 16-bit value. 
               
               
                   
                   
                 Channel 
               
               
                   
                   
                 Count 
               
               
                   
                   
               
             
          
         
       
     
     Request Level Count (Master→Master) 
     This message requests, from the destination device, the number of levels supported by the specified device/port. The initial assumption that the master makes is that each device/port in the system has eight levels. 
     Message and Parameters 
     
       
         
               
               
               
               
             
           
               
                   
                   
               
               
                   
                 Field 
                 Value(s) 
                 Description 
               
               
                   
                   
               
             
             
               
                   
                 MC 
                 0x0012 
                 Request Level Count Value 
               
               
                   
                 MD[1 . . . 2] 
                 Device 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[3 . . . 4] 
                 Port 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[5 . . . 6] 
                 System 
                 Unsigned 16-bit value. 
               
               
                   
                   
               
             
          
         
       
     
     Level Count (Device→Master,Master→Master) 
     This message is the response from a master to the Request Level Count message above. It is sent by a device/port upon reporting if the device has more than eight levels. 
     Message and Parameters 
     
       
         
               
               
               
               
             
           
               
                   
                   
               
               
                   
                 Field 
                 Value(s) 
                 Description 
               
               
                   
                   
               
             
             
               
                   
                 MC 
                 0x0092 
                 Level Count Value 
               
               
                   
                 MD[1 . . . 2] 
                 Device 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[3 . . . 4] 
                 Port 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[5 . . . 6] 
                 System 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[7 . . . 8] 
                 Level 
                 Unsigned 16-bit value. 
               
               
                   
                   
                 Count 
               
               
                   
                   
               
             
          
         
       
     
     Request String Size (Master→Master) 
     This message requests the number of elements per string and the string types supported by the device/port. 
     The initial assumption that the master makes is that each device/port in the system supports 64 elements/string and only supports 8-bit character strings. 
     Message and Parameters 
     
       
         
               
               
               
               
             
           
               
                   
                   
               
               
                   
                 Field 
                 Value(s) 
                 Description 
               
               
                   
                   
               
             
             
               
                   
                 MC 
                 0x0013 
                 Request String Size Value 
               
               
                   
                 MD[1 . . . 2] 
                 Device 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[3 . . . 4] 
                 Port 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[5 . . . 6] 
                 System 
                 Unsigned 16-bit value. 
               
               
                   
                   
               
             
          
         
       
     
     String Size (Device→Master,Master→Master) 
     This message is the response from a master to the Request String Size message above. It is sent by a device/port upon reporting if the device/port supports more than 64 byte strings or more than 8-bit character strings. It returns the maximum number of elements/string the device supports and the types of strings supported. 
     Note that when transferring messages, the size of the message will be determined by the smaller of the maximum string size supported by the device and maximum packet size supported by the low-level bus protocol. 
     Message and Parameters 
     
       
         
               
               
               
             
           
               
                   
               
               
                 Field 
                 Value(s) 
                 Description 
               
               
                   
               
             
             
               
                 MC 
                 0x0093 
                 String Size Value 
               
               
                 MD[1 . . . 2] 
                 Device 
                 Unsigned 16-bit value. 
               
               
                 MD[3 . . . 4] 
                 Port 
                 Unsigned 16-bit value. 
               
               
                 MD[5 . . . 6] 
                 System 
                 Unsigned 16-bit value. 
               
               
                 MD[7] 
                 ValueType 
                 Unsigned 8-bit value. The String ValueType 
               
               
                   
                 Specifier 
                 Specifiers supported are ORed together into 
               
               
                   
                   
                 this field. 
               
               
                 MD[8 . . . 9] 
                 Length 
                 Unsigned 16-bit value. 
               
               
                   
               
             
          
         
       
     
     String ValueType Specifiers 
     
       
         
               
               
               
               
               
             
           
               
                   
               
               
                 Keyword 
                 Data 
                 Type 
                   
                   
               
               
                 Type 
                 Type 
                 Specifier 
                 Size 
                 Range 
               
               
                   
               
             
             
               
                 CHAR Arrays 
                 “Normal” 
                 0x01 
                  8-bit 
                 Variable length strings 
               
               
                   
                 String 
                   
                   
                 (i.e. an array of 
               
               
                   
                   
                   
                   
                 characters) 
               
               
                 WIDECHAR 
                 “Unicode” 
                 0x02 
                 16-bit 
                 Variable length strings 
               
               
                 Arrays 
                 String 
                   
                   
                 (i.e. an array of WIDE 
               
               
                   
                   
                   
                   
                 characters) 
               
               
                   
               
             
          
         
       
     
     Request Command Size (Master→Master) 
     This message requests the number of elements per command and the string types supported by the device/port. The initial assumption that the master makes is that each device/port in the system supports 64 elements/command and only supports 8-bit character arrays. 
     Message and Parameters 
     
       
         
               
               
               
               
             
           
               
                   
                   
               
               
                   
                 Field 
                 Value(s) 
                 Description 
               
               
                   
                   
               
             
             
               
                   
                 MC 
                 0x0014 
                 Request Command Size Value 
               
               
                   
                 MD[1 . . . 2] 
                 Device 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[3 . . . 4] 
                 Port 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[5 . . . 6] 
                 System 
                 Unsigned 16-bit value. 
               
               
                   
                   
               
             
          
         
       
     
     Command Size (Device→Master) 
     This message is the response, from a device, to the Request Command Size message above. It is sent by a device/port upon reporting if the device/port supports more than 64 byte commands or more than 8-bit character commands. It returns the maximum number of elements/command the device supports and the types of strings supported. 
     Note that when transferring messages, the size of the message will be determined by the smaller of the maximum command size supported by the device and maximum packet size supported by the low-level bus protocol. 
     Message and Parameters 
     
       
         
               
               
               
             
           
               
                   
               
               
                 Field 
                 Value(s) 
                 Description 
               
               
                   
               
             
             
               
                 MC 
                 0x0094 
                 String Size Value 
               
               
                 MD[1 . . . 2] 
                 Device 
                 Unsigned 16-bit value. 
               
               
                 MD[3 . . . 4] 
                 Port 
                 Unsigned 16-bit value. 
               
               
                 MD[5 . . . 6] 
                 System 
                 Unsigned 16-bit value. 
               
               
                 MD[7] 
                 ValueType 
                 Unsigned 8-bit value. The String ValueType 
               
               
                   
                 Specifier 
                 Specifiers supported are ORed together into 
               
               
                   
                   
                 this field. 
               
               
                 MD[8 . . . 9] 
                 Length 
                 Unsigned 16-bit value. 
               
               
                   
               
             
          
         
       
     
     String ValueType Specifiers 
     
       
         
               
               
               
               
               
             
           
               
                   
               
               
                 Keyword 
                 Data 
                 Type 
                   
                   
               
               
                 Type 
                 Type 
                 Specifier 
                 Size 
                 Range 
               
               
                   
               
             
             
               
                 CHAR Arrays 
                 “Normal” 
                 0x01 
                  8-bit 
                 Variable length strings 
               
               
                   
                 String 
                   
                   
                 (i.e. an array of 
               
               
                   
                   
                   
                   
                 characters) 
               
               
                 WIDECHAR 
                 “Unicode” 
                 0x02 
                 16-bit 
                 Variable length strings 
               
               
                 Arrays 
                 String 
                   
                   
                 (i.e. an array of WIDE 
               
               
                   
                   
                   
                   
                 characters) 
               
               
                   
               
             
          
         
       
     
     Request Level Size (Master→Master) 
     This message requests a list of data types supported for the specified level. The initial assumption that the master makes is that each device/port/level only supports 8-bit unsigned values (BYTE Type 0x10). 
     Message and Parameters 
     
       
         
               
               
               
               
             
           
               
                   
                   
               
               
                   
                 Field 
                 Value(s) 
                 Description 
               
               
                   
                   
               
             
             
               
                   
                 MC 
                 0x0015 
                 Request Level Size Value 
               
               
                   
                 MD[1 . . . 2] 
                 Device 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[3 . . . 4] 
                 Port 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[5 . . . 6] 
                 System 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[7 . . . 8] 
                 Level 
                 Unsigned 16-bit value. 
               
               
                   
                   
               
             
          
         
       
     
     Level Size (Device→Master,Master→Master) 
     This message is the response from a master to the Request Level Size message above. It is sent by a device/port upon reporting if the device/port/level supports more BYTE (Type 0x10) levels. It returns a list of data types supported by Level. 
     Note that when transferring levels, the master will typecast from larger sized types to the largest type supported by the device. For example, if the users Axcess 2  program sends a FLOAT to a device that supports only BYTE,CHAR, and INTEGER types, the master typecasts the FLOAT to an INTEGER before sending to the device. 
     Message and Parameters 
     
       
         
               
               
               
             
           
               
                   
               
               
                 Field 
                 Value(s) 
                 Description 
               
               
                   
               
             
             
               
                 MC 
                 0x0095 
                 Level Size Value 
               
               
                 MD[1 . . . 2] 
                 Device 
                 Unsigned 16-bit value. 
               
               
                 MD[3 . . . 4] 
                 Port 
                 Unsigned 16-bit value. 
               
               
                 MD[5 . . . 6] 
                 System 
                 Unsigned 16-bit value. 
               
               
                 MD[7 . . . 8] 
                 Level 
                 Unsigned 16-bit value. 
               
               
                 MD[9] 
                 Count of 
                 Unsigned 8-bit value. This is the count of 
               
               
                   
                 ValueTypes 
                 bytes to follow where each byte represents 
               
               
                   
                   
                 a supported level type. 
               
               
                 MD[10 . . . n] 
                 List of 
                 Unsigned 8-bit array of ValueTypes. 
               
               
                   
                 ValueTypes 
               
               
                   
               
             
          
         
       
     
     ValueType Specifiers 
     
       
         
               
               
               
               
             
           
               
                   
                   
               
               
                   
                 Type 
                 Specifier 
                 # of Bytes 
               
               
                   
                   
               
             
             
               
                   
                 BYTE 
                 0x10 
                 1 
               
               
                   
                 CHAR 
                 0x11 
                 1 
               
               
                   
                 WIDECHAR 
                 0x20 
                 2 
               
               
                   
                 INTEGER 
                 0x20 
                 2 
               
               
                   
                 SINTEGER 
                 0x21 
                 2 
               
               
                   
                 ULONG 
                 0x40 
                 4 
               
               
                   
                 LONG 
                 0x41 
                 4 
               
               
                   
                 FLOAT 
                 0x4F 
                 4 
               
               
                   
                 DOUBLE 
                 0x8F 
                 8 
               
               
                   
                   
               
             
          
         
       
     
     Request Status (Master→Master) 
     This message requests, from the destination device, the status of the device or port. 
     Message and Parameters 
     
       
         
               
               
               
               
             
           
               
                   
                   
               
               
                   
                 Field 
                 Value(s) 
                 Description 
               
               
                   
                   
               
             
             
               
                   
                 MC 
                 0x0016 
                 Request Status Code Value 
               
               
                   
                 MD[1 . . . 2] 
                 Device 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[3 . . . 4] 
                 Port 
                 Unsigned 16-bit value. 
               
               
                   
                   
                   
                 If port = 0 then 
               
               
                   
                   
                   
                 requesting status of device. 
               
               
                   
                 MD[5 . . . 6] 
                 System 
                 Unsigned 16-bit value. 
               
               
                   
                   
               
             
          
         
       
     
     Status (Device→Master,Master→Master) 
     This message is the response from a master to the Request Status Code message above. It is sent by a device/port if the device/port needs to update the master of a status change. 
     Message and Parameters 
     
       
         
               
               
               
             
           
               
                   
               
               
                 Field 
                 Value(s) 
                 Description 
               
               
                   
               
             
             
               
                 MC 
                 0x0096 
                 Status Code Value 
               
               
                 MD[1 . . . 2] 
                 Device 
                 Unsigned 16-bit value. 
               
               
                 MD[3 . . . 4] 
                 Port 
                 Unsigned 16-bit value. 
               
               
                 MD[5 . . . 6] 
                 System 
                 Unsigned 16-bit value. 
               
               
                 MD[7 . . . 8] 
                 StatusCode 
                 Unsigned 16-bit value. If port = 0 then 
               
               
                   
                   
                 status of device instead of port. 
               
               
                 MD[9] 
                 ValueType 
                 Unsigned 8-bit value. Type of 
               
               
                   
                 Specifier 
                 StatusString. 
               
               
                 MD[10 . . . 11] 
                 Length 
                 Unsigned 16-bit value. Number of 
               
               
                   
                   
                 characters in string (i.e. number of 
               
               
                   
                   
                 elements, this is not the number of bytes) 
               
               
                 MD[12 . . . n] 
                 StatusString 
                 Length characters. (n or n*2 bytes) 
               
               
                   
               
             
          
         
       
     
     Request Device Info (Master→Device) 
     This message requests device specific information from the specified device. 
     Message and Parameters 
     
       
         
               
               
               
               
             
           
               
                   
                   
               
               
                   
                 Field 
                 Value(s) 
                 Description 
               
               
                   
                   
               
             
             
               
                   
                 MC 
                 0x0017 
                 Request Device Info Value 
               
               
                   
                 MD[1 . . . 2] 
                 Device 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[3 . . . 4] 
                 System 
                 Unsigned 16-bit value. 
               
               
                   
                   
               
             
          
         
       
     
     Device Info (Device→Master) 
     This message is the response to the Request Device Info message above. 
     Flag—A 16-bit bit field. Each bit indicates a unique aspect of functionality. 
     For each device and sub-device that contains re-programmable electronic components within the device, the following information is replied: 
     ObjectID—An 8-bit unique (within the device) identifier that identifies this structure of information. This is used to construct an internal device hierarchy for display to the user. 
     ParentID—An 8-bit value that references an existing ObjectID. If 0, then this object has no parent. 
     ManufactureID—A 16-bit value that uniquely identifies the manufacture of the device. 
     DeviceID—A 16-bit value that uniquely identifies the device type. 
     Serial number—A fixed length field 16 bytes long. 
     FWID (Firmware ID)—A 16-bit value that uniquely identifies the object code that the device requires. 
     Version—A NULL terminated text string that indicates the revision level of the re-programmable component. 
     DeviceID String—A NULL terminated text string that indicates the name or model number of the device. 
     Manufacturer String—A NULL terminated text string that indicates the name of the device manufacturer. 
     Extended Address Format—An 8-bit value that indicates the type of device specific addressing information to follow. 
     Extended Address Length—An 8-bit value that indicates the length of device specific addressing information to follow. 
     Extended Address—Extended Address as indicated by Extended Address Type and Length. 
     Message and Parameters 
     
       
         
               
               
               
             
           
               
                   
               
               
                 Field 
                 Value(s) 
                 Description 
               
               
                   
               
             
             
               
                 MC 
                 0x0097 
                 Device Info Value 
               
               
                 MD[1 . . . 2] 
                 Device 
                 Unsigned 16-bit value. 
               
               
                 MD[3 . . . 4] 
                 System 
                 Unsigned 16-bit value. 
               
               
                 MD[5 . . . 6] 
                 Flag 
                 16-bit bit field. 
               
               
                   
                   
                 Bit 0 - If set, this message was generated 
               
               
                   
                   
                 in response to a button press while 
               
               
                   
                   
                 Identify mode is active. 
               
               
                 MD[7] 
                 ObjectID 
                 Unsigned 8-bit value. 
               
               
                 MD[8] 
                 ParentID 
                 Unsigned 8-bit value. 
               
               
                 MD[9 . . . 10] 
                 MfgID 
                 Unsigned 16-bit value. 
               
               
                 MD[11 . . . 12] 
                 DeviceID 
                 Unsigned 16-bit value. 
               
               
                 MD[13 . . . 28] 
                 Serial- 
                 16 bytes of data. Format not defined yet. 
               
               
                   
                 Number 
               
               
                 MD[29 . . . 30] 
                 FWID 
                 Unsigned 16-bit value. 
               
               
                 MD[31 . . . n] 
                 Version 
                 CHAR array, NULL terminated, 
               
               
                   
                   
                 containing a version string. 
               
               
                   
                   
                 Generally, in this format: 
               
               
                   
                   
                 “v1.00\0” 
               
               
                 MD[n + 1 . . . p] 
                 DeviceID 
                 CHAR array, NULL terminated, 
               
               
                   
                 String 
                 containing a model number. 
               
               
                   
                   
                 Generally, in this format: 
               
               
                   
                   
                 “NXC-232\0” 
               
               
                   
                   
                 (NetLinx Card- RS232) 
               
               
                 MD[p + 1 . . . q] 
                 Manu- 
                 CHAR array, NULL terminated, 
               
               
                   
                 facture 
                 containing the mfg.&#39;s name. 
               
               
                   
                 String 
                 Generally, in this format: 
               
               
                   
                   
                 “AMX Corp/0” 
               
               
                 MD[q + 1] 
                 Extended 
                 8-bit value. Used to indicate type of 
               
               
                   
                 Address 
                 extended address to follow. 
               
               
                   
                 Type 
               
               
                 MD[q + 2] 
                 Extended 
                 8-bit value. Used to indicate length in 
               
               
                   
                 Address 
                 bytes of extended address to follow 
               
               
                   
                 Length 
               
               
                 MD[q + 3 . . . r] 
                 Extended 
                 Extended Address as indicated by 
               
               
                   
                 Address 
                 Extended Address Type and Length. 
               
               
                   
               
             
          
         
       
     
     Extended Address Type 
     
       
         
               
               
             
           
               
                   
               
               
                 Type 
                 Description 
               
               
                   
               
             
             
               
                 0x01 
                 Neuron ID. Length will be 6 and address will be the 48- 
               
               
                   
                 bit Neuron ID of the device. 
               
               
                 0x02 
                 IP4 Address. Length will be 4 and address will be the 
               
               
                   
                 4-byte IP address of the device. 
               
               
                 0x03 
                 AXLink Connection. Length must be 0. 
               
               
                 0x13 
                 RS232 Connection. Length must be 0. 
               
               
                 All others 
                 Reserved. 
               
               
                   
               
             
          
         
       
     
     Device Info EOT(Master→Device). 
     This message indicates that all data (Device Info messages) have been sent as a result of a Request Device Info message. This message indicates to the requesting device that all Device Info information has been provided. 
     Message and Parameters 
     
       
         
               
               
               
               
             
           
               
                   
                   
               
               
                   
                 Field 
                 Value(s) 
                 Description 
               
               
                   
                   
               
             
             
               
                   
                 MC 
                 0x0098 
                 Device Info EOT Value 
               
               
                   
                 MD[1 . . . 2] 
                 Device 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[3 . . . 4] 
                 System 
                 Unsigned 16-bit value. 
               
               
                   
                   
               
             
          
         
       
     
     Request Master Status (Device→Master,Master→Master) 
     This message requests that the master respond with its status. Generally, Master Status message will be unsolicited, this message is included for completeness. 
     Message and Parameters 
     
       
         
               
               
               
               
             
           
               
                   
                   
               
               
                   
                 Field 
                 Value(s) 
                 Description 
               
               
                   
                   
               
             
             
               
                   
                 MC 
                 0x00A1 
                 Request Master Status Value 
               
               
                   
                 MD[1 . . . 2] 
                 System 
                 Unsigned 16-bit value. 
               
               
                   
                   
               
             
          
         
       
     
     Master Status (Master→Device,Master→Master) 
     This message is the response to the Request Master Status message above, but more commonly will be sent by the master unsolicited. 
     Message and Parameters 
     
       
         
               
               
               
               
             
           
               
                   
                   
               
               
                   
                 Field 
                 Value(s) 
                 Description 
               
               
                   
                   
               
             
             
               
                   
                 MC 
                 0x0021 
                 Master Status Value 
               
               
                   
                 MD[1 . . . 2] 
                 System 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[3 . . . 4] 
                 Status 
                 Unsigned 16-bit value treated as bit 
               
               
                   
                   
                   
                 fields. See below. 
               
               
                   
                 MD[5 . . . n] 
                 StatusString 
                 CHAR array, NULL terminated, 
               
               
                   
                   
                   
                 containing a text description of the 
               
               
                   
                   
                   
                 status. For example, “Master Reset” 
               
               
                   
                   
               
             
          
         
       
     
     Master Status is defined as follows: 
     Bits 1 &amp; 0 are encoded as shown in the table below. 
     
       
         
               
               
               
               
             
           
               
                   
                   
               
               
                   
                 Bit 1 
                 Bit 0 
                   
               
               
                   
                 State 
                 State 
                 Meaning 
               
               
                   
                   
               
             
             
               
                   
                 0 
                 0 
                 Reset 
               
               
                   
                   
                   
                 When a device receives this status of the 
               
               
                   
                   
                   
                 master all channels on the device should be 
               
               
                   
                   
                   
                 turned off, all levels should be set to 
               
               
                   
                   
                   
                 zero, and the device shall enter the 
               
               
                   
                   
                   
                 “unconnected” state (see the Device &amp; 
               
               
                   
                   
                   
                 Master Communication Specification) 
               
               
                   
                 0 
                 1 
                 Reload 
               
               
                   
                   
                   
                 When a device receives this status of the 
               
               
                   
                   
                   
                 master, it must stop sending messages to 
               
               
                   
                   
                   
                 the master until the master&#39;s status 
               
               
                   
                   
                   
                 becomes Normal. No channels are turned 
               
               
                   
                   
                   
                 off. 
               
               
                   
                 1 
                 0 
                 Undefined 
               
               
                   
                 1 
                 1 
                 Normal 
               
               
                   
                   
                   
                 Upon entry in to the Normal state, the 
               
               
                   
                   
                   
                 device must report that it is on-line and 
               
               
                   
                   
                   
                 any channels that are ON, or non-zero 
               
               
                   
                   
                   
                 levels must be reported to the master. 
               
               
                   
                   
               
             
          
         
       
     
     Bits 15-2: Undefined should be zero. 
     Diagnostic Manager 
     The following messages originate from or are destined for the Diagnostic Manager: 
     The Diagnostic Messages will be better specified during/after the Diagnostic Manager specification is complete. 
     
       
         
               
               
               
             
           
               
                   
               
               
                 Command 
                 Value 
                 Description 
               
               
                   
               
             
             
               
                 Internal 
                 0x0101 
                 Used to display/convey a diagnostic 
               
               
                 Diagnostic 
                   
                 message. It includes a severity level, 
               
               
                 String 
                   
                 module ID, and a string. 
               
               
                   
                   
                 These messages are generated 
               
               
                   
                   
                 internally within the master. 
               
               
                 Request 
                 0x0102 
                 Registers the sending device with the 
               
               
                 Diagnostic 
                   
                 diagnostic manager such that diagnostic 
               
               
                 Information 
                   
                 information be sent the source device. 
               
               
                 Request 
                 0x0103 
                 Master responds with Device Info 
               
               
                 Devices 
                   
                 message(s) for each device currently on- 
               
               
                 On-line 
                   
                 line and the number of ports for each 
               
               
                   
                   
                 device. 
               
               
                 Request Devices 
                 0x0109 
                 Indicates that all on-line device 
               
               
                 On-line EOT 
                   
                 information has been sent. 
               
               
                 Request Device 
                 0x0104 
                 Master responds with a variety of messages 
               
               
                 Status 
                   
                 that indicate the current state of the 
               
               
                   
                   
                 device. 
               
               
                 Request Device 
                 0x010A 
                 Indicates that all Device Status 
               
               
                 Status EOT 
                   
                 information has been sent. 
               
               
                 Request 
                 0x0105 
                 Requests the entire list of device/ports 
               
               
                 Asynchronous 
                   
                 currently in the Master&#39;s asynchronous 
               
               
                 Notification 
                   
                 notification list. 
               
               
                 List 
               
               
                 Asynchronous 
                 0x0106 
                 Contains a single entry from the Master&#39;s 
               
               
                 Notification 
                   
                 asynchronous notification list. 
               
               
                 List 
               
               
                 Add/modify 
                 0x0107 
                 Adds or modifies an entry in the Master&#39;s 
               
               
                 asynchronous 
                   
                 asynchronous notification list. 
               
               
                 Notification 
               
               
                 List 
               
               
                 Delete 
                 0x0108 
                 Delete one or all entries in the Master&#39;s 
               
               
                 asynchronous 
               
               
                 Notification 
                   
                 asynchronous notification list. 
               
               
                 List 
               
               
                   
               
             
          
         
       
     
     Internal Diagnostic String 
     This message is used by tasks within the master to log/display error or diagnostic messages. 
     Message and Parameters 
     
       
         
               
               
               
             
           
               
                   
               
               
                 Field 
                 Value(s) 
                 Description 
               
               
                   
               
             
             
               
                 MC 
                 0x0101 
                 Internal Diagnostic String 
               
               
                 MD[1 . . . 2] 
                 Object ID 
                 Unsigned 16-bit value. Values defined in 
               
               
                   
                   
                 the Constants &amp; IDs specification document. 
               
               
                 MD[3 . . . 4] 
                 Severity 
                 Unsigned 16-bit value. 
               
               
                 MD[5 . . . n] 
                 Diagnostic 
                 CHAR array, NULL terminated, containing a 
               
               
                   
                 String 
                 text description of the error. For 
               
               
                   
                   
                 example, “Self-test failed #2” 
               
               
                   
               
             
          
         
       
     
     Request Diagnostic Information 
     This message is used by the IDE to request that diagnostic information be sent to the requesting device. If any flag bits are set, unsolicited diagnostic messages of the specified type(s) will be sent to the device. If all bits are zero, then no diagnostic message will be sent to the device. 
     Message and Parameters 
     
       
         
               
               
               
               
             
           
               
                   
                   
               
               
                   
                 Field 
                 Value(s) 
                 Description 
               
               
                   
                   
               
             
             
               
                   
                 MC 
                 0x0102 
                 Request Diagnostic Information 
               
               
                   
                 MD[1 . . . 2] 
                 Flag 
                 Bit Field: 
               
               
                   
                   
                   
                 0 - Enable Internal Diagnostic Strings 
               
               
                   
                   
                   
                 1-15 - Undefined (must be 0) 
               
               
                   
                   
               
             
          
         
       
     
     Request Devices Online 
     This message is used by the IDE to request a list of online devices for the receiving NetLinx master. The master will respond with Device Info message(s) for each device currently online. In addition, it will generate a Port Count message for each device. 
     Message and Parameters 
     
       
         
               
               
               
               
             
           
               
                   
                   
               
               
                   
                 Field 
                 Value(s) 
                 Description 
               
               
                   
                   
               
             
             
               
                   
                 MC 
                 0x0103 
                 Request Devices Online 
               
               
                   
                   
               
             
          
         
       
     
     Request Devices Online EOT 
     This message indicates that all requested devices from the Request Devices Online message have been sent. This message is used by the IDE to determine when all online device information has been received. 
     Message and Parameters 
     
       
         
               
               
               
               
             
           
               
                   
                   
               
               
                   
                 Field 
                 Value(s) 
                 Description 
               
               
                   
                   
               
             
             
               
                   
                 MC 
                 0x0109 
                 Request Devices Online 
               
               
                   
                   
               
             
          
         
       
     
     Request Device Status 
     This message is used by the IDE to request the status of the specified device. The master responds with Output ON messages for each output channel that is on, Feedback ON messages for each feedback channel that is on, etc. See the Diagnostic Manager specification for more information. 
     Message and Parameters 
     
       
         
               
               
               
               
             
           
               
                   
                   
               
               
                   
                 Field 
                 Value(s) 
                 Description 
               
               
                   
                   
               
             
             
               
                   
                 MC 
                 0x0104 
                 Request Device Status 
               
               
                   
                 MD[1 . . . 2] 
                 Device 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[3 . . . 4] 
                 Port 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[5 . . . 6] 
                 System 
                 Unsigned 16-bit value. 
               
               
                   
                   
               
             
          
         
       
     
     Request Device Status EOT 
     This message indicates that all of the Request Device Status information has been sent. This message is used by the IDE to determine when all device status information has been received. 
     Message and Parameters 
     
       
         
               
               
               
               
             
           
               
                   
                   
               
               
                   
                 Field 
                 Value(s) 
                 Description 
               
               
                   
                   
               
             
             
               
                   
                 MC 
                 0x010A 
                 Request Device Status 
               
               
                   
                 MD[1 . . . 2] 
                 Device 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[3 . . . 4] 
                 Fort 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[5 . . . 6] 
                 System 
                 Unsigned 16-bit value. 
               
               
                   
                   
               
             
          
         
       
     
     Request Asynchronous Notification List 
     This message is used by the IDE to request the current asynchronous notification list from the master. 
     The master generates a series of Asynchronous Notification List messages, one for each entry in the list, to the requesting device. 
     Message and Parameters 
     
       
         
               
               
               
               
             
           
               
                   
                   
               
               
                   
                 Field 
                 Value(s) 
                 Description 
               
               
                   
                   
               
             
             
               
                   
                 MC 
                 0x0105 
                 Request Asynchronous 
               
               
                   
                   
                   
                 Notification List 
               
               
                   
                   
               
             
          
         
       
     
     Asynchronous Notification List p This message is generated by the master in response to the Request Asynchronous Notification List message. 
     For each entry in the master&#39;s list, one of these messages will be generated. If there are no entries, then the number of entries field will be zero. See the Diagnostic Manager specification for more information. 
     Message and Parameters 
     
       
         
               
               
               
             
           
               
                   
               
               
                 Field 
                 Value(s) 
                 Description 
               
               
                   
               
             
             
               
                 MC 
                 0x0106 
                 Asynchronous Notification List 
               
               
                 MD[1 . . . 2] 
                 Total 
                 Unsigned 16-bit value containing the total 
               
               
                   
                 Count 
                 number of entries in the list. 
               
               
                 MD[3 . . . 4] 
                 This 
                 Unsigned 16-bit value containing the item 
               
               
                   
                 Index 
                 number beginning with 1. This will be 
               
               
                   
                   
                 incremented for each item until it equals 
               
               
                   
                   
                 Total Count. 
               
               
                 MD[5 . . . 6] 
                 Device 
                 Unsigned 16-bit value. 
               
               
                 MD[7 . . . 8] 
                 Port 
                 Unsigned 16-bit value. 
               
               
                 MD[9 . . . 10] 
                 System 
                 Unsigned 16-bit value. 
               
               
                 MD[11 . . . 14] 
                 Flag 
                 32 Bit field (if the bit is set, the 
               
               
                   
                   
                 messages are enabled) 
               
               
                   
                   
                 Bit - 0: Online/offline messages 
               
               
                   
                   
                 Bit - 1: Configuration messages 
               
               
                   
                   
                 Bit - 2: Input channel changes 
               
               
                   
                   
                 Bit - 3: Output channel changes 
               
               
                   
                   
                 Bit - 4: Feedback channel changes 
               
               
                   
                   
                 Bit - 5: Level changes from device 
               
               
                   
                   
                 Bit - 6: Level changes to device 
               
               
                   
                   
                 Bit - 7: Strings from device 
               
               
                   
                   
                 Bit - 8: Strings to device 
               
               
                   
                   
                 Bit - 9: Commands from device 
               
               
                   
                   
                 Bit - 10: Commands to device 
               
               
                   
                   
                 Bit - 11: Status messages 
               
               
                   
                   
                 Bit 12-31: Undefined. Should be zero. 
               
               
                   
               
             
          
         
       
     
     Add/Modify Asynchronous Notification List 
     This message is used to add an entry into the Asynchronous Notification List or modify an existing entry. The master will generate a Completion Code (Configuration Manager message 0x0213) message indicating success or failure of this command. A special sentinel value of Device=0, Port=0, and System=0 indicates that the flags should be applied to the global filter. 
     Message and Parameters 
     
       
         
               
               
               
             
           
               
                   
               
               
                 Field 
                 Value(s) 
                 Description 
               
               
                   
               
             
             
               
                 MC 
                 0x0107 
                 Add/Modify Asynchronous 
               
               
                   
                   
                 Notification List 
               
               
                 MD[1 . . . 2] 
                 Device 
                 Unsigned 16-bit value. 
               
               
                 MD[3 . . . 4] 
                 Port 
                 Unsigned 16-bit value. 
               
               
                 MD[5 . . . 6] 
                 System 
                 Unsigned 16-bit value. 
               
               
                 MD[7 . . . 10] 
                 Flag 
                 32 Bit field (if the bit is set, the 
               
               
                   
                   
                 messages are enabled): 
               
               
                   
                   
                 Bit 0: Online/offline messages 
               
               
                   
                   
                 Bit - 1: Configuration messages 
               
               
                   
                   
                 Bit - 2: Input channel changes 
               
               
                   
                   
                 Bit - 3: Output channel changes 
               
               
                   
                   
                 Bit - 4: Feedback channel changes 
               
               
                   
                   
                 Bit - 5: Level changes from device 
               
               
                   
                   
                 Bit - 6: Level changes to device 
               
               
                   
                   
                 Bit - 7: Strings from device 
               
               
                   
                   
                 Bit - 8: Strings to device 
               
               
                   
                   
                 Bit - 9: Commands from device 
               
               
                   
                   
                 Bit - 10: Commands to device 
               
               
                   
                   
                 Bit - 11: Status messages 
               
               
                   
                   
                 Bit 12-31: Undefined. Should be zero. 
               
               
                   
               
             
          
         
       
     
     Delete Asynchronous Notification List 
     This message is used to delete an/all entr(y)/(ies) from the Asynchronous Notification List. The master will generate a Completion Code (Configuration Manager message 0x0213) message indicating success or failure of this command. A special sentinel value of Device=0, Port=0, and System=0 indicates that the global filter should be deleted. Another special sentinel value of Device=65535, Port=65535, and System=65535 indicates that all entries should be deleted. 
     Message and Parameters 
     
       
         
               
               
               
               
             
           
               
                   
                   
               
               
                   
                 Field 
                 Value(s) 
                 Description 
               
               
                   
                   
               
             
             
               
                   
                 MC 
                 0x0108 
                 Add/Modify Asynchronous 
               
               
                   
                   
                   
                 Notification List 
               
               
                   
                 MD[1 . . . 2] 
                 Device 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[3 . . . 4] 
                 Port 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[5 . . . 6] 
                 System 
                 Unsigned 16-bit value. 
               
               
                   
                   
               
             
          
         
       
     
     Connection Manager Messages 
     Table B lists commands between connection manager and devices. Again, the first column is the name of the command, the second column is the value of the command, the third column is the device response, the fourth column is the master response and the last column is the description of the command. For example, on the second row, if the blink command sent by a master to a device, the value of the command is 0x0502 and in response to that command the device says nothing nor does the master. The description of the command is given to all devices to make the LED blink. As this occurs, the master determines whether the device is online and sends back a visual indication. 
     
       
         
               
               
               
             
               
               
               
               
               
             
           
               
                   
                 TABLE B 
               
             
             
               
                   
                   
               
               
                   
                 Valid Response 
                   
               
               
                   
                 Messages From 
               
             
          
           
               
                   
                   
                 DE- 
                 MAS- 
                   
               
               
                 Command 
                 Value 
                 VICE 
                 TER 
                 Description 
               
               
                   
               
               
                 Ping Request 
                 0x0501 
                 0x0581 
                 0x0581 
                 Requests a ping response 
               
               
                 (Master-&gt;Device) 
                   
                   
                   
                 from the destination 
               
               
                   
                   
                   
                   
                 device. 
               
               
                 Ping Response 
                 0x0581 
                 None 
                 None 
                 Reply to the Ping 
               
               
                 (Device-&gt;Master) 
                   
                   
                   
                 Request. The master 
               
               
                   
                   
                   
                   
                 uses the response to 
               
               
                   
                   
                   
                   
                 confirm that the device 
               
               
                   
                   
                   
                   
                 is active in the system. 
               
               
                 Blink 
                 0x0502 
                 None 
                 None 
                 Periodically broadcast 
               
               
                 (Master-&gt;Device) 
                   
                   
                   
                 to all devices. 
               
               
                   
                   
                   
                   
                 Includes LED blink and 
               
               
                   
                   
                   
                   
                 other information. 
               
               
                 Request Blink 
                 0x0582 
                 Error 
                 0x0502 
                 Requests a Blink 
               
               
                 (Device-&gt;Master) 
                   
                   
                   
                 message. Intended to be 
               
               
                   
                   
                   
                   
                 generated by one master 
               
               
                   
                   
                   
                   
                 to another. 
               
               
                 Dynamic Device 
                 0x0503 
                 0x0001 
                 0x0001 
                 Assigned address 
               
               
                 Address 
                   
                   
                   
                 response. 
               
               
                 (Master-&gt;Device) 
               
               
                 Request Dynamic 
                 0x0583 
                 Error 
                 0x0503 
                 Request a dynamic 
               
               
                 Device Address 
                   
                   
                   
                 address . . . use the 
               
               
                 (Device-&gt;Master) 
                   
                   
                   
                 Newbee flag. 
               
               
                 Pass Through 
                 0x0584 
                 Error 
                 0x0001 
                 Requests that strings 
               
               
                 (Device-&gt;Master) 
                   
                   
                   
                 from the specified 
               
               
                   
                   
                   
                   
                 device get sent to 
               
               
                   
                   
                   
                   
                 another specified 
               
               
                   
                   
                   
                   
                 device. 
               
               
                 Request 
                 0x0507 
                 Error 
                 0x0001 
                 Requests notification of 
               
               
                 Notification 
                   
                   
                   
                 specific messages from a 
               
               
                 (Master-&gt;Master) 
                   
                   
                   
                 device. 
               
               
                   
               
             
          
         
       
     
     Ping Request (Master→Device) 
     This message is sent by a master to request determine the presence of the specified device in the system. 
     
       
         
               
               
               
               
             
           
               
                   
                   
               
               
                   
                 Field 
                 Value(s) 
                 Description 
               
               
                   
                   
               
             
             
               
                   
                 MC 
                 0x0501 
                 PingRequest value 
               
               
                   
                 MD[1 . . . 2] 
                 Device 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[3 . . . 4] 
                 System 
                 Unsigned 16-bit value. 
               
               
                   
                   
               
             
          
         
       
     
     Ping Response (Device→Master) 
     This message is the response to the Ping Request message above. The device responds with this message to inform the requester that the device is still on-line. 
     
       
         
               
               
               
             
           
               
                   
               
               
                 Field 
                 Value(s) 
                 Description 
               
               
                   
               
             
             
               
                 MC 
                 0x0581 
                 PingResponse value 
               
               
                 MD[1 . . . 2] 
                 Device 
                 Unsigned 16-bit value. 
               
               
                 MD[3 . . . 4] 
                 System 
                 Unsigned 16-bit value. 
               
               
                 MD[5 . . . 6] 
                 MfgID 
                 Unsigned 16-bit value. The Manufacture ID 
               
               
                   
                   
                 as reported in the Device Info message for 
               
               
                   
                   
                 ParentID = 0 and ObjectID = 0 
               
               
                 MD[7 . . . 8] 
                 DeviceID 
                 Unsigned 16-bit value. The Device ID as 
               
               
                   
                   
                 reported in the Device Info message for 
               
               
                   
                   
                 ParentID = 0 and ObjectID = 0 
               
               
                 MD[9] 
                 Extended 
                 8-bit value. Used to indicate type of 
               
               
                   
                 Address 
                 extended address to follow. 
               
               
                   
                 Type 
               
               
                 MD[10] 
                 Extended 
                 8-bit value. Used to indicate length in 
               
               
                   
                 Address 
                 bytes of extended address to follow 
               
               
                   
                 Length 
               
               
                 MD[11 . . . ] 
                 Extended 
                 Extended address as indicated by Extended 
               
               
                   
                 Address 
                 Address Type and Length. 
               
               
                   
               
             
          
         
       
     
     Extended Address Type 
     
       
         
               
               
               
             
           
               
                   
                   
               
               
                   
                 Type 
                 Description 
               
               
                   
                   
               
             
             
               
                   
                 0x01 
                 Neuron ID. Length will be 6 and address 
               
               
                   
                   
                 will be the 48-bit Neuron ID of the device. 
               
               
                   
                 0x02 
                 IP4 Address. Length will be 4 and address 
               
               
                   
                   
                 will be the 4-byte IP address of the 
               
               
                   
                   
                 device. 
               
               
                   
                 0x03 
                 AXLink Connection. Length must be 0. 
               
               
                   
                 0x13 
                 RS232 Connection. Length must be 0. 
               
               
                   
                 All others 
                 Reserved. 
               
               
                   
                   
               
             
          
         
       
     
     Blink (Master→Device) 
     The blink message is a broadcast message that is transmitted to every device periodically. The time period of the message may be dependent upon the medium in which the message will be sent. 
     Message and Parameters 
     
       
         
               
               
               
             
           
               
                   
               
               
                 Field 
                 Value(s) 
                 Description 
               
               
                   
               
             
             
               
                 MC 
                 0x0502 
                 Blink Value 
               
               
                 MD[0] 
                 Heartbeat 
                 Tenths of seconds between heartbeats. 
               
               
                   
                 Timing 
               
               
                 MD[1] 
                 LED 
                 State of Bus LED and other Status. 
               
               
                   
                   
                 Bit 0 - Bus LED 0 = OFF, 1 = ON. 
               
               
                   
                   
                 Bits 1-6 Reserved. 
               
               
                   
                   
                 Bit 7 - Forced Device Unconfigure/Reset 
               
               
                 MD[2] 
                 Month 
                 Current Date: Month 1-12 
               
               
                 MD[3] 
                 Day 
                 Day 1-31 
               
               
                 MD[4 . . . 5] 
                 Year 
                 Year 1999-65535 (Type: unsigned 16-bit) 
               
               
                 MD[6] 
                 Hour 
                 Current Time: Hour 0-23 
               
               
                 MD[7] 
                 Minute 
                 Minute 0-59 
               
               
                 MD[8] 
                 Second 
                 Seconds 0-59 
               
               
                 MD[9] 
                 Day of 
                 0 = Mon, 1 = Tues, . . . 
               
               
                   
                 Week 
               
               
                 MD[10 . . . 11] 
                 Outside 
                 Outside Temperature (if available) 
               
               
                   
                 Temp 
                 [Type: signed 16-bit) If 0x8000, then 
               
               
                   
                   
                 temperature is not valid. 
               
               
                 MD[12 . . . n] 
                 Text Date 
                 CHAR array, NULL terminated, 
               
               
                   
                 Date 
                 Formatted as: 
               
               
                   
                 String 
                 “Thursday, Jun. 10, 1999” 
               
               
                   
               
             
          
         
       
     
     The time period for Blink messages is not determined at this time. Each device implementation may not require that the Blink message be periodically sent at any anticipated rate. The ideal rate will be determined based upon the quantity of bus traffic. It may, someday, even be determined dynamically. 
     The LED byte is a bit field. The LSB (bit 0) indicates the current status of the bus LED. 
     The MSB (Bit 7) is set when the master initially powers-up/on-line. In response to bit 7 being set, the receiving device should place itself in the off-line state, turn all channels off, and set all levels to zero (or prepare itself to send status updates as necessary to the master). The master shall send 3 consecutive blink messages with bit 7 set. 
     Request Blink (Device→Master) 
     This message requests from the destination master, a Blink message response. The response will not be a global response, it will be destined only to the requester. 
     Message and Parameters 
     
       
         
               
               
               
               
             
           
               
                   
                   
               
               
                   
                 Field 
                 Value(s) 
                 Description 
               
               
                   
                   
               
             
             
               
                   
                 MC 
                 0x0582 
                 ReqBlink Value 
               
               
                   
                 MD[1 . . . 2] 
                 System 
                 unsigned 16-bit value. 
               
               
                   
                   
               
             
          
         
       
     
     Dynamic Device Address (Master→Device) 
     This message is the response to the Request Dynamic Device Address message below. It returns a device number for “temporary” use by the requesting device. 
     The device can use this device number for as long as it has communication with the master. The returned device number may the one suggested by the device in the Request Dynamic Device Address message or may be different. 
     Message and Parameters 
     
       
         
               
               
               
             
           
               
                   
               
               
                 Field 
                 Value(s) 
                 Description 
               
               
                   
               
             
             
               
                 MC 
                 0x0503 
                 DynDevAddress Value 
               
               
                 MD[1 . . . 2] 
                 Device 
                 Unsigned 16-bit value. Newly assigned or 
               
               
                   
                   
                 Requested device number for the device&#39;s 
               
               
                   
                   
                 use. 
               
               
                 MD[3 . . . 4] 
                 System 
                 Unsigned 16-bit value. The appropriate 
               
               
                   
                   
                 system number. 
               
               
                   
               
             
          
         
       
     
     Request Dynamic Device Address (Device→Master) This message requests a device number from a master. 
     The Newbee flag must be set in the message header. 
     Message and Parameters 
     
       
         
               
               
               
             
           
               
                   
               
               
                 Field 
                 Value(s) 
                 Description 
               
               
                   
               
             
             
               
                 MC 
                 0x0583 
                 Request Dynamic Device Address 
               
               
                   
                   
                 Value 
               
               
                 MD[1 . . . 2] 
                 ProposedDevice 
                 unsigned 16-bit value. If possible 
               
               
                   
                   
                 for the device, is the last device 
               
               
                   
                   
                 number that this device used. 
               
               
                 MD[3] 
                 Extended 
                 8-bit value. Used to indicate type of 
               
               
                   
                 Address 
                 extended address to follow. 
               
               
                   
                 Type 
               
               
                 MD[4] 
                 Extended 
                 8-bit value. Used to indicate length in 
               
               
                   
                 Address 
                 bytes of extended address to follow 
               
               
                   
                 Length 
               
               
                 MD[5 . . . ] 
                 Extended 
                 Extended address as indicated by 
               
               
                   
                 Address 
                 Extended Address Type and Length. 
               
               
                   
               
             
          
         
       
     
     Extended Address Type 
     
       
         
               
               
             
           
               
                   
               
               
                 Type 
                 Description 
               
               
                   
               
             
             
               
                 0x01 
                 Neuron ID. Length will be 6 and address will be the 48-bit 
               
               
                   
                 Neuron ID of the device. 
               
               
                 0x02 
                 IP4 Address. Length will be 4 and address will be the 4-byte 
               
               
                   
                 IP address of the device. 
               
               
                 0x03 
                 AXLink Connection. Length must be 0. 
               
               
                 0x13 
                 RS232 Connection. Length must be 0. 
               
               
                 All others 
                 Reserved. 
               
               
                   
               
             
          
         
       
     
     Pass Through 
     This message requests that the Connection manager redirect strings coming from the specified source device to the specified destination device. This will also prohibit strings from the source device getting sent to the interpreter until the PassThrough is disabled. This message will cause an ‘RXON’ message to be sent to the source AXLink device. 
     Message and Parameters 
     
       
         
               
               
               
             
           
               
                   
               
               
                 Field 
                 Value(s) 
                 Description 
               
               
                   
               
             
             
               
                 MC 
                 0x0584 
                 Pass Through Value 
               
               
                 MD[1 . . . 2] 
                 SrcDevice 
                 Unsigned 16-bit value. Source AXLink 
               
               
                   
                   
                 device. 
               
               
                 MD[3 . . . 4] 
                 DstDevice 
                 Unsigned 16-bit value. Destination device 
               
               
                   
                   
                 address. 
               
               
                 MD[5 . . . 6] 
                 DstPort 
                 Unsigned 16-bit value. Destination Device 
               
               
                   
                   
                 Port address. 
               
               
                 MD[7 . . . 8] 
                 DstSystem 
                 Unsigned 16-bit value. Destination System 
               
               
                   
                   
                 Address. 
               
               
                 MD[9] 
                 Enable 
                 Unsigned 8-bit value. Bit field: 
               
               
                   
                   
                 Bit 0-1 = Enable pass through. 0 = disable. 
               
               
                   
               
             
          
         
       
     
     Request Notification 
     This message is sent by a master to request notification of specific messages that are received from OR sent to the specified device. Typically, the notification messages are Device Manager messages (specified above). 
     
       
         
               
               
               
             
           
               
                   
               
               
                 Field 
                 Value(s) 
                 Description 
               
               
                   
               
             
             
               
                 MC 
                 0x0507 
                 RequestNotification value 
               
               
                 MD[1 . . . 2] 
                 DstSystem 
                 Unsigned 16-bit value. The destination 
               
               
                   
                   
                 system of this (RequestNotification) 
               
               
                   
                   
                 message. 
               
               
                 MD[3 . . . 4] 
                 DstDevice 
                 Unsigned 16-bit value. The specific 
               
               
                   
                   
                 source device of interest. 
               
               
                 MD[5 . . . 6] 
                 SrcSystem 
                 Unsigned 16-bit value. The system 
               
               
                   
                   
                 requesting the notification messages. 
               
               
                 MD[7 . . . 8] 
                 SrcDevice 
                 Unsigned 16-bit value. The device 
               
               
                   
                   
                 requesting the notification messages. 
               
               
                 MD[9 . . . 10) 
                 MessageCount 
                 Unsigned 16-bit value. Number of 
               
               
                   
                   
                 Messages in following list. 
               
               
                 ND [11 . . . n] 
                 Messages 
                 Array of unsigned 16-bit values. Each 
               
               
                   
                   
                 value identifies a specific message. For 
               
               
                   
                   
                 example, 0x000A indicates that any 
               
               
                   
                   
                 Level Value messages to or from 
               
               
                   
                   
                 Device should be sent to SrcSystem. 
               
               
                   
               
             
          
         
       
     
     The following message command values are not actual messages, but rather virtual “commands” to the Notification Manager that function as follows: 
     0×FFFF—deletes all existing notification requests for the device from this master. 
     Diagnostic Manager 
     The following messages originate from or are destined for the Diagnostic Manager: 
     
       
         
               
               
               
             
           
               
                   
               
               
                 Command 
                 Value 
                 Description 
               
               
                   
               
             
             
               
                 Internal 
                 0x0101 
                 Used to display/convey a diagnostic 
               
               
                 Diagnostic 
                   
                 message. It includes a severity level, 
               
               
                 String 
                   
                 module ID, and a string. These messages 
               
               
                   
                   
                 are generated internally within the master. 
               
               
                 Request 
                 0x0102 
                 Registers the sending device with the 
               
               
                 Diagnostic 
                   
                 diagnostic manager such that diagnostic 
               
               
                 Information 
                   
                 information be sent the source device. 
               
               
                 Request 
                 0x0103 
                 Master responds with Device Info 
               
               
                 Devices 
                   
                 message(s) for each device currently 
               
               
                 On-line 
                   
                 on-line and the number of ports 
               
               
                   
                   
                 for each device. 
               
               
                 Request Devices 
                 0x0109 
                 Indicates that all on-line device 
               
               
                 On-line EOT 
                   
                 information has been sent. 
               
               
                 Request Device 
                 0x0104 
                 Master responds with a variety of 
               
               
                 Status 
                   
                 messages that indicate the current 
               
               
                   
                   
                 state of the device. 
               
               
                 Request Device 
                 0x010A 
                 Indicates that all Device Status 
               
               
                 Status EOT 
                   
                 information has been sent. 
               
               
                 Request 
                 0x0105 
                 Requests the entire list of device/ports 
               
               
                 Asynchronous 
                   
                 currently in the Master&#39;s asynchronous 
               
               
                 Notification List 
                   
                 notification list. 
               
               
                 Asynchronous 
                 0x0106 
                 Contains a single entry from the Master&#39;s 
               
               
                 Notification List 
                   
                 asynchronous notification list. 
               
               
                 Add/modify 
                 0x0107 
                 Adds or modifies an entry in the Master&#39;s 
               
               
                 asynchronous 
                   
                 asynchronous notification list. 
               
               
                 Notification List 
               
               
                 Delete 
                 0x0108 
                 Delete one or all entries in the Master&#39;s 
               
               
                 asynchronous 
                   
                 asynchronous notification list. 
               
               
                 Notification List 
               
               
                   
               
             
          
         
       
     
     Internal Diagnostic String 
     This message is used by tasks within the master to log/display error or diagnostic messages. 
     Message and Parameters 
     
       
         
               
               
               
             
           
               
                   
               
               
                 Field 
                 Value(s) 
                 Description 
               
               
                   
               
             
             
               
                 MC 
                 0x0101 
                 Internal Diagnostic String 
               
               
                 MD[1 . . . 2] 
                 Object ID 
                 Unsigned 16-bit value. Values defined in 
               
               
                   
                   
                 the Constants &amp; IDs specification document. 
               
               
                 MD[3 . . . 4] 
                 Severity 
                 Unsigned 16-bit value. 
               
               
                 MD[5 . . . n] 
                 Diagnostic 
                 CHAR array, NULL terminated, containing a 
               
               
                   
                 String 
                 text description of the error. For 
               
               
                   
                   
                 example, “Self-test failed #2” 
               
               
                   
               
             
          
         
       
     
     Request Diagnostic Information 
     This message is used by the IDE to request that diagnostic information be sent to the requesting device. If any flag bits are set, unsolicited diagnostic messages of the specified type(s) will be sent to the device. If all bits are zero, then no diagnostic message will be sent to the device. 
     Message and Parameters 
     
       
         
               
               
               
             
           
               
                   
               
               
                 Field 
                 Value(s) 
                 Description 
               
               
                   
               
             
             
               
                 MC 
                 0x0102 
                 Request Diagnostic Information 
               
               
                 MD[1 . . . 2] 
                 Flag 
                 Bit Field: 
               
               
                   
                   
                 0 - Enable Internal Diagnostic Strings 
               
               
                   
                   
                 1-15 - Undefined (must be 0) 
               
               
                   
               
             
          
         
       
     
     Request Devices Online 
     This message is used by the IDE to request a list of online devices for the receiving NetLinx master. The master will respond with Device Info message(s) for each device currently online. In addition, it will generate a Port Count message for each device. 
     Message and Parameters 
     
       
         
               
               
               
               
             
           
               
                   
                   
               
               
                   
                 Field 
                 Value(s) 
                 Description 
               
               
                   
                   
               
             
             
               
                   
                 MC 
                 0x0103 
                 Request Devices Online 
               
               
                   
                   
               
             
          
         
       
     
     Request Devices Online EOT 
     This message indicates that all requested devices from the Request Devices Online message have been sent. This message is used by the IDE to determine when all online device information has been received. 
     Message and Parameters 
     
       
         
               
               
               
               
             
           
               
                   
                   
               
               
                   
                 Field 
                 Value(s) 
                 Description 
               
               
                   
                   
               
             
             
               
                   
                 MC 
                 0x0109 
                 Request Devices Online 
               
               
                   
                   
               
             
          
         
       
     
     Request Device Status 
     This message is used by the IDE to request the status of the specified device. The master responds with Output ON messages for each output channel, that is on, Feedback ON messages for each feedback channel that is on, etc. See the Diagnostic Manager specification for more information. 
     Message and Parameters 
     
       
         
               
               
               
               
             
           
               
                   
                   
               
               
                   
                 Field 
                 Value(s) 
                 Description 
               
               
                   
                   
               
             
             
               
                   
                 MC 
                 0x0104 
                 Request Device Status 
               
               
                   
                 MD[1 . . . 2] 
                 Device 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[3 . . . 4] 
                 Port 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[5 . . . 6] 
                 System 
                 Unsigned 16-bit value. 
               
               
                   
                   
               
             
          
         
       
     
     Request Device Status EOT 
     This message indicates that all of the Request Device Status information has been sent. This message is used by the IDE to determine when all device status information has been received. 
     Message and Parameters 
     
       
         
               
               
               
               
             
           
               
                   
                   
               
               
                   
                 Field 
                 Value(s) 
                 Description 
               
               
                   
                   
               
             
             
               
                   
                 MC 
                 0x010A 
                 Request Device Status 
               
               
                   
                 MD[1 . . . 2] 
                 Device 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[3 . . . 4] 
                 Port 
                 Unsigned 16-bit value. 
               
               
                   
                 MD[5 . . . 6] 
                 System 
                 Unsigned 16-bit value. 
               
               
                   
                   
               
             
          
         
       
     
     Request Asynchronous Notification List 
     This message is used by the IDE to request the current asynchronous notification list from the master. The master generates a series of Asynchronous Notification List messages, one for each entry in the list, to the requesting device. 
     Message and Parameters 
     
       
         
               
               
               
               
             
           
               
                   
                   
               
               
                   
                 Field 
                 Values(s) 
                 Description 
               
               
                   
                   
               
             
             
               
                   
                 MC 
                 0x0105 
                 Request Asynchronous Notification List 
               
               
                   
                   
               
             
          
         
       
     
     Asynchronous Notification List 
     This message is generated by the master in response to the Request Asynchronous Notification List message. For each entry in the master&#39;s list, one of these messages will be generated. If there are no entries, then the number of entries field will be zero. See the Diagnostic Manager specification for more information. 
     Message and Parameters 
     
       
         
               
               
               
             
           
               
                   
               
               
                 Field 
                 Value(s) 
                 Description 
               
               
                   
               
             
             
               
                 MC 
                 0x0106 
                 Asynchronous Notification List 
               
               
                 MD[1 . . . 2] 
                 Total Count 
                 Unsigned 16-bit value containing the 
               
               
                   
                   
                 total number to entries in the list. 
               
               
                 MD[3 . . . 4] 
                 This index 
                 Unsigned 16-bit value containing the 
               
               
                   
                   
                 item number beginning with 1. This 
               
               
                   
                   
                 will be incremented for each item until 
               
               
                   
                   
                 it equals Total Count. 
               
               
                 MD[5 . . . 6] 
                 Device 
                 Unsigned 16-bit value. 
               
               
                 MD[7 . . . 8] 
                 Port 
                 Unsigned 16-bit value. 
               
               
                 MD[9 . . . 10] 
                 System 
                 Unsigned 16-bit value. 
               
               
                 MD[11 . . . 14] 
                 Flag 
                 32 Bit field (if the bit is set, the 
               
               
                   
                   
                 messages are enabled) : 
               
               
                   
                   
                 Bit - 0: Online/offline messages 
               
               
                   
                   
                 Bit - 1: Configuration messages 
               
               
                   
                   
                 Bit - 2: Input channel changes 
               
               
                   
                   
                 Bit - 3: Output channel changes 
               
               
                   
                   
                 Bit - 4: Feedback channel changes 
               
               
                   
                   
                 Bit - 5: Level changes from device 
               
               
                   
                   
                 Bit - 6: Level changes to device 
               
               
                   
                   
                 Bit - 7: Strings from device 
               
               
                   
                   
                 Bit - 8: Strings to device 
               
               
                   
                   
                 Bit - 9: Commands from device 
               
               
                   
                   
                 Bit - 10: Commands to device 
               
               
                   
                   
                 Bit - 11: Status messages 
               
               
                   
                   
                 Bit 12-31: Undefined. Should be zero. 
               
               
                   
               
             
          
         
       
     
     Add/Modify Asynchronous Notification List 
     This message is used to add an entry into the Asynchronous Notification List or modify an existing entry. The master will generate a Completion Code (Configuration Manager message 0x0213) message indicating success or failure of this command. A special sentinel value of Device=0, Port=0, and System=0 indicates that the flags should be applied to the global filter. 
     Message and Parameters 
     
       
         
               
               
               
             
           
               
                   
               
               
                 Field 
                 Value(s) 
                 Description 
               
               
                   
               
             
             
               
                 MC 
                 0x0107 
                 Add/Modify Asynchronous Notification List 
               
               
                 MD[1 . . . 2] 
                 Device 
                 Unsigned 16-bit value. 
               
               
                 MD[3 . . . 4] 
                 Port 
                 Unsigned 16-bit value. 
               
               
                 MD[5 . . . 6] 
                 System 
                 Unsigned 16-bit value. 
               
               
                 MD[7 . . . 10] 
                 Flag 
                 32 Bit field (if the bit is set, the 
               
               
                   
                   
                 messages are enabled): 
               
               
                   
                   
                 Bit - 0: Online/offline messages 
               
               
                   
                   
                 Bit - 1: Configuration messages 
               
               
                   
                   
                 Bit - 2: Input channel changes 
               
               
                   
                   
                 Bit - 3: Output channel changes 
               
               
                   
                   
                 Bit - 4: Feedback channel changes 
               
               
                   
                   
                 Bit - 5: Level changes from device 
               
               
                   
                   
                 Bit - 6: Level changes to device 
               
               
                   
                   
                 Bit - 7: Strings from device 
               
               
                   
                   
                 Bit - 8: Strings to device 
               
               
                   
                   
                 Bit - 9: Commands from device 
               
               
                   
                   
                 Bit - 10: Commands to device 
               
               
                   
                   
                 Bit - 11: Status messages 
               
               
                   
                   
                 Bit 12-31: Undefined. Should be zero. 
               
               
                   
               
             
          
         
       
     
     Delete Asynchronous Notification List 
     This message is used to delete an/all entr(y)/(ies) from the Asynchronous Notification List. The master will generate a Completion Code (Configuration Manager message 0x0213) message indicating success or failure of this command. A special sentinel value of Device=0, Port=0, and System=0 indicates that the global filter should be deleted. Another special sentinel value of Device=65535, Port=65535, and System=65535 indicates that all entries should be deleted. 
     Message and Parameters 
     
       
         
               
               
               
             
           
               
                   
               
               
                 Field 
                 Value(s) 
                 Description 
               
               
                   
               
             
             
               
                 MC 
                 0x0108 
                 Add/Modify Asynchronous Notification List 
               
               
                 MD[1 . . . 2] 
                 Device 
                 Unsigned 16-bit value. 
               
               
                 MD[3 . . . 4] 
                 Port 
                 Unsigned 16-bit value. 
               
               
                 MD[5 . . . 6] 
                 System 
                 Unsigned 16-bit value. 
               
               
                   
               
             
          
         
       
     
     Configuration Manager 
     The following messages originate from or are destined for the Configuration Manager: 
     
       
         
               
               
               
               
             
               
               
               
               
               
             
           
               
                   
               
               
                   
                   
                 Valid Response 
                   
               
               
                   
                   
                 Messages From 
                   
               
             
          
           
               
                 Command 
                 Value 
                 DEVICE 
                 MASTER 
                 Description 
               
               
                   
               
               
                 Set Device 
                 0x0201 
                 0x0213 
                 0x0213 
                 Sets the device/ 
               
               
                 Number 
                   
                   
                   
                 system number of 
               
               
                 (Master-&gt;Device, 
                   
                   
                   
                 the receiving 
               
               
                 Master-&gt;Master) 
                   
                   
                   
                 device. 
               
               
                 Set Identify 
                 0x0202 
                 None 
                 None 
                 Enables/Disables 
               
               
                 Mode/Address 
                   
                   
                   
                 identify mode for 
               
               
                 (Master-&gt;Device) 
                   
                   
                   
                 the device and 
               
               
                   
                   
                   
                   
                 establishes the 
               
               
                   
                   
                   
                   
                 new device 
               
               
                   
                   
                   
                   
                 number. 
               
               
                 Set Serial 
                 0x0203 
                 0x0213 
                 0x0213 
                 Sets the 16-byte 
               
               
                 Number 
                   
                   
                   
                 serial number of 
               
               
                   
                   
                   
                   
                 the device. 
               
               
                 File Transfer 
                 0x0204 
                 0x0204 
                 0x0204 
                 Contains file 
               
               
                   
                   
                   
                   
                 transfer 
               
               
                   
                   
                   
                   
                 information 
               
               
                 Request IP 
                 0x0205 
                 0x0206 
                 0x0206 
                 Requests the list 
               
               
                 Address List 
                   
                   
                   
                 of IP address the 
               
               
                   
                   
                   
                   
                 device will 
               
               
                   
                   
                   
                   
                 attempt to contact 
               
               
                 IP Address List 
                 0x0206 
                 None 
                 None 
                 List of IP 
               
               
                   
                   
                   
                   
                 address 
               
               
                 Add IP Address 
                 0x0207 
                 0x0213 
                 0x0213 
                 Add the specified 
               
               
                   
                   
                   
                   
                 IP address to the 
               
               
                   
                   
                   
                   
                 contact 
               
               
                 Delete IP Address 
                 0x0208 
                 0x0213 
                 0x0213 
                 Delete an 
               
               
                   
                   
                   
                   
                 specified IP 
               
               
                   
                   
                   
                   
                 address from the 
               
               
                   
                   
                   
                   
                 contact list. 
               
               
                 Set DNS 
                 0x0209 
                 0x0213 
                 0x0213 
                 Sets the DNS IP 
               
               
                 IP Addresses 
                   
                   
                   
                 address list and 
               
               
                   
                   
                   
                   
                 domain name. 
               
               
                 Request DNS 
                 0x020A 
                 0x020B 
                 0x020B 
                 Requests the DNS 
               
               
                 IP Addresses 
                   
                   
                   
                 IP address list and 
               
               
                   
                   
                   
                   
                 domain name. 
               
               
                 Get DNS 
                 0x020B 
                 None 
                 None 
                 Gets the DNS IP 
               
               
                 IP Addresses 
                   
                   
                   
                 address list and 
               
               
                   
                   
                   
                   
                 domain name. 
               
               
                 Set Ethernet 
                 0x020C 
                 0x0213 
                 0x0213 
                 Sets the IP 
               
               
                 IP Address 
                   
                   
                   
                 address, subnet 
               
               
                   
                   
                   
                   
                 mask, and 
               
               
                   
                   
                   
                   
                 gateway. 
               
               
                 Request Ethernet 
                 0x020D 
                 0x020D 
                 0x020D 
                 Requests the 
               
               
                 IP Address 
                   
                   
                   
                 Ethernet 
               
               
                   
                   
                   
                   
                 interface&#39;s IP 
               
               
                   
                   
                   
                   
                 address, subnet 
               
               
                   
                   
                   
                   
                 mask, and 
               
               
                   
                   
                   
                   
                 gateway. 
               
               
                 Get Ethernet 
                 0x020E 
                 None 
                 None 
                 Response to 
               
               
                 IP Address 
                   
                   
                   
                 Request Ethernet 
               
               
                   
                   
                   
                   
                 IP Addrss. 
               
               
                 Set Time &amp; Date 
                 0x020F 
                 0x0213 
                 0x0213 
                 Sets the Time 
               
               
                   
                   
                   
                   
                 and Date. 
               
               
                 Request Time &amp; 
                 0x0210 
                 0x0211 
                 0x0211 
                 Requests the 
               
               
                 Date 
                   
                   
                   
                 current Time and 
               
               
                   
                   
                   
                   
                 Date. 
               
               
                 Get Time &amp; Date 
                 0x0211 
                 None 
                 None 
                 Gets the current 
               
               
                   
                   
                   
                   
                 Time and Date. 
               
               
                 Identify Mode/ 
                 0x0282 
                 None 
                 None 
                 Response to 
               
               
                 Address Response 
                   
                   
                   
                 Identify Mode/ 
               
               
                   
                   
                   
                   
                 Address. 
               
               
                 Restart 
                 0x0212 
                 0x0213 
                 0x0213 
                 Restart device or 
               
               
                   
                   
                   
                   
                 subset of device. 
               
               
                 Completion Code 
                 0x0213 
                 None 
                 None 
                 For some 
               
               
                   
                   
                   
                   
                 messages, 
               
               
                   
                   
                   
                   
                 confirms 
               
               
                   
                   
                   
                   
                 successful 
               
               
                   
                   
                   
                   
                 completion or 
               
               
                   
                   
                   
                   
                 failure of a 
               
               
                   
                   
                   
                   
                 message. 
               
               
                 Reserved 
                 0x02E0- 
                   
                   
                 Reserved message 
               
               
                 Messages 
                 0x02FF 
                   
                   
                 range. 
               
               
                   
               
             
          
         
       
     
     Set Device Number 
     Used to set the Device number of un-configured devices. 
     
       
         
               
               
               
             
           
               
                   
               
               
                 Field 
                 Value(s) 
                 Description 
               
               
                   
               
             
             
               
                 MC 
                 0x0201 
                 Set Device number. 
               
               
                 MD[1] 
                 Configuration 
                 Used to indicate the type of 
               
               
                   
                 Flags 
                 configuration and the validity 
               
               
                   
                   
                 of the following data. 
               
               
                 MD[2 . . . 3] 
                 Device 
                 Unsigned 16-bit value. The 
               
               
                   
                 Number 
                 specific device number to 
               
               
                   
                   
                 become. 
               
               
                 MD[4 . . . 5] 
                 System 
                 Unsigned 16-bit value. The 
               
               
                   
                   
                 specific system number to set. 
               
               
                   
               
             
          
         
       
     
     Configuration Flags 
     
       
         
               
               
               
             
           
               
                   
               
               
                 Bit 
                   
                   
               
               
                 Value 
                 Type 
                 Description 
               
               
                   
               
             
             
               
                 0x01 
                 Device 
                 Device Number in data is valid and should 
               
               
                   
                 Field Vaild 
                 be stored. 
               
               
                 0x02 
                 System 
                 System Number in data is valid and should 
               
               
                   
                 Field Valid 
                 be stored. 
               
               
                 0x04 
                 Future 
               
               
                 0x08 
                 Future 
               
               
                 0x10 
                 Future 
               
               
                 0x20 
                 Future 
               
               
                 0x40 
                 Future 
               
               
                 0x80 
                 Erase all 
                 Erase current setting and return to default. 
               
               
                   
                 Current 
               
               
                   
                 System/Device 
               
               
                   
                 Settings 
               
               
                   
               
             
          
         
       
     
     Set Identify Mode/Address 
     Places/removes the device into/from the Identify state. While the device is in the identify state, a press of the identify button causes the device to take on the specified Device/System. The device should respond with the Identify Mode/Address Response, report its old device as off-line, then report the new device as on-line. 
     
       
         
               
               
               
             
           
               
                   
               
               
                 Field 
                 Value(s) 
                 Description 
               
               
                   
               
             
             
               
                 MC 
                 0x0202 
                 Set Identify mode 
               
               
                 MD[1] 
                 Flags 
                 Unsigned 8-bit value. 
               
               
                   
                   
                 Bit 0: 
               
               
                   
                   
                 0 - Disable Identify Mode 
               
               
                   
                   
                 1 - Enable Identify Mode 
               
               
                 MD[2 . . . 3] 
                 NewDevice 
                 Unsigned 16-bit value. New device number. 
               
               
                 MD[4 . . . 5] 
                 NewSystem 
                 Unsigned 16-bit value. New system number. 
               
               
                   
               
             
          
         
       
     
     Set Serial Number 
     Used to set the serial number of the specified device. 
     
       
         
               
               
               
             
           
               
                   
               
               
                 Field 
                 Value(s) 
                 Description 
               
               
                   
               
             
             
               
                 MC 
                 0x0203 
                 Set Serial Number. 
               
               
                 MD[1 . . . 16] 
                 Serial 
                 The devices 16-byte serial number. This 
               
               
                   
                 Number 
                 serial number is reported via the Device 
               
               
                   
                   
                 Info message. 
               
               
                   
               
             
          
         
       
     
     File Transfer 
     This command initiates the transfer of data for a device or master. It is intended that this transfer mechanism be common to all types of file transfers including firmware upgrades, IR data, touch panel design files. 
     
       
         
               
               
               
             
           
               
                   
               
               
                 Field 
                 Value(s) 
                 Description 
               
               
                   
               
             
             
               
                 MC 
                 0x0204 
                 File Transfer 
               
               
                 MD[1 . . . 2] 
                 FileType 
                 Unsigned 16-bit value: 
               
               
                   
                   
                 0 = Unused 
               
               
                   
                   
                 1 = IR Data 
               
               
                   
                   
                 2 = Firmware 
               
               
                   
                   
                 3 = Touch Panel File 
               
               
                   
                   
                 4 = Axcess2 Tokens 
               
               
                 MD[3 . . . 4] 
                 Function 
                 The function to execute, such as receive, 
               
               
                   
                   
                 send, etc. Values 0-255 are predefined. 
               
               
                   
                   
                 All other values are based upon the 
               
               
                   
                   
                 FileType. 
               
               
                 MD[5 . . . n] 
                 Data 
                 It any, contains Function specific data. 
               
               
                   
               
             
          
         
       
     
     Request IP address list 
     Requests for the device to respond with the list of IP addresses the device or master attempts to contact. 
     
       
         
               
               
               
               
             
           
               
                   
                   
               
               
                   
                 Field 
                 Value(s) 
                 Description 
               
               
                   
                   
               
             
             
               
                   
                 MC 
                 0x0205 
                 Request IP Address List 
               
               
                   
                   
               
             
          
         
       
     
     IP Address List 
     The response to the request above, one IP Address List message will be generated for each IP address in the list. 
     
       
         
               
               
               
             
           
               
                   
               
               
                 Field 
                 Value(s) 
                 Description 
               
               
                   
               
             
             
               
                 MC 
                 0x0206 
                 IP Address List 
               
               
                 MD[1 . . . 2] 
                 Total Count 
                 Unsigned 16-bit value containing 
               
               
                   
                   
                 the total number of addresses. 
               
               
                 MD[3 . . . 4] 
                 ThisIndex 
                 Unsigned 16-bit value containing the 
               
               
                   
                   
                 item number beginning with 1. This 
               
               
                   
                   
                 will be incremented for each address 
               
               
                   
                   
                 until it equals Total Count. 
               
               
                 MD[5] 
                 Flag 
                 Bit field: 
               
               
                   
                   
                 Bit - 0; Connection Mode. 
               
               
                   
                   
                 0 = UDP connection 
               
               
                   
                   
                 1 = TCP connection 
               
               
                   
                   
                 Bit - 1: Unused 
               
               
                   
                   
                 Bit - 2: Unused 
               
               
                   
                   
                 Bit - 3: Unused 
               
               
                   
                   
                 Bit - 4: Unused 
               
               
                   
                   
                 Bit - 5: Source of Entry 
               
               
                   
                   
                 0 = IDE generated 
               
               
                   
                   
                 1 = NetLinx Language generated 
               
               
                   
                   
                 Bits - 6 &amp; 7: Encoded connection state 
               
               
                   
                   
                 00 = (0x00) Looking up URL 
               
               
                   
                   
                 01 = (0x40) Attempting connection 
               
               
                   
                   
                 10 = (0x80) Waiting for 
               
               
                   
                   
                 connection valid 
               
               
                   
                   
                 11 = (0xC0) Connected 
               
               
                 MD[6 . . . 7] 
                 Port Number 
                 Unsigned 16-bit value containing 
               
               
                   
                   
                 the port number to connect. 
               
               
                 MD[8 . . . n] 
                 URL 
                 Null terminated address string. Either a 
               
               
                   
                   
                 URL, or IP address in the form of 
               
               
                   
                   
                 “192.168.26.148” 
               
               
                 MD[n+1 . . . p] 
                 IP Address 
                 Null terminated IP address string. If the 
               
               
                   
                   
                 URL has been lookup up, Contains 
               
               
                   
                   
                 the IP address of the URL. 
               
               
                   
               
             
          
         
       
     
     Add IP Address 
     Add a URL or IP address to the device&#39;s IP address list. 
     
       
         
               
               
               
             
           
               
                   
               
               
                 Field 
                 Value(s) 
                 Description 
               
               
                   
               
             
             
               
                 MC 
                 0x0207 
                 Add IP Address 
               
               
                 MD[1] 
                 Flag 
                 Bit field: 
               
               
                   
                   
                 Bit - 0: Connection Mode. 
               
               
                   
                   
                 0 = UDP connection 
               
               
                   
                   
                 1 = TCP connection 
               
               
                   
                   
                 Bit - 1: Unused 
               
               
                   
                   
                 Bit - 2: Unused 
               
               
                   
                   
                 Bit - 3: Unused 
               
               
                   
                   
                 Bit - 4: Unused 
               
               
                   
                   
                 Bit - 5: Source of Entry 
               
               
                   
                   
                 0 = IDE generated 
               
               
                   
                   
                 1 = NetLinx Language generated 
               
               
                   
                   
                 Bit - 6: Unused 
               
               
                   
                   
                 Bit - 7: Unused 
               
               
                 MD[2 . . . 3] 
                 Port Number 
                 Unsigned 16-bit value containing 
               
               
                   
                   
                 the port number to connect (normally 1319). 
               
               
                 MD[4 . . . n] 
                 URL 
                 Null terminated address string. Either a 
               
               
                   
                   
                 URL, or IP address in the form of 
               
               
                   
                   
                 “192.168.26.148” 
               
               
                   
               
             
          
         
       
     
     Delete IP Address 
     Delete one or all URLs or IP addresses from the device&#39;s IP address list. 
     
       
         
               
               
               
             
           
               
                   
               
               
                 Field 
                 Value(s) 
                 Description 
               
               
                   
               
             
             
               
                 MC 
                 0x0208 
                 Delete IP Address 
               
               
                 MD[1] 
                 DeleteFlag 
                 Bit field: 
               
               
                   
                   
                 Bit 0 - It set, delete all URLs. 
               
               
                   
                   
                 Bit 1 - Unused. 
               
               
                   
                   
                 Bit 2 - Unused. 
               
               
                   
                   
                 Bit 3 - Unused. 
               
               
                   
                   
                 Bit 4 - Unused. 
               
               
                   
                   
                 Bit 5 - Unused. 
               
               
                   
                   
                 Bit 6 - Unused. 
               
               
                   
                   
                 Bit 7 - Unused. 
               
               
                 MD[2] 
                 Flag 
                 Bit field: 
               
               
                   
                   
                 Bit - 0: Connection Mode. 
               
               
                   
                   
                 0 = UDP connection 
               
               
                   
                   
                 1 = TCP connection 
               
               
                   
                   
                 Bit - 1: Unused 
               
               
                   
                   
                 Bit - 2: Unused 
               
               
                   
                   
                 Bit - 3: Unused 
               
               
                   
                   
                 Bit - 4: Unused 
               
               
                   
                   
                 Bit - 5: Source of Entry 
               
               
                   
                   
                 0 = IDE generated 
               
               
                   
                   
                 1 = NetLinx Language generated 
               
               
                   
                   
                 Bit - 6: Unused 
               
               
                   
                   
                 Bit - 7: Unused 
               
               
                 MD[3 . . . 4] 
                 Port Number 
                 Unsigned 16-bit value containing 
               
               
                   
                   
                 the port number to connect (normally 1319). 
               
               
                 MD[5 . . . n] 
                 URL 
                 Null terminated address string. Either a 
               
               
                   
                   
                 URL, or IP address in the form of 
               
               
                   
                   
                 “192.168.26.148” 
               
               
                   
               
             
          
         
       
     
     Set DNS IP Addresses 
     Set the IP address(es) of the DNS servers and the domain name. A maximum of three (3) IP addresses may be specified. The search order is same as the order provided. A NULL must be provided for empty entries. 
     
       
         
               
               
               
             
           
               
                   
               
               
                 Field 
                 Value(s) 
                 Description 
               
               
                   
               
             
             
               
                 MC 
                 0x0209 
                 Set DNS IP Address 
               
               
                 MD[1 . . . n] 
                 Domain Name 
                 Null terminated name string. This 
               
               
                   
                   
                 name gets appended to names without 
               
               
                   
                   
                 a dot. Example, “panja.com” 
               
               
                 MD[n+1 . . . p] 
                 DNS IP 
                 Null terminated address string. Must 
               
               
                   
                 Address1 
                 be the IP address in dot notation form 
               
               
                   
                   
                 (e.g. “192.168.25.5”) 
               
               
                 MD[p+1 . . . q] 
                 DNS IP 
                 Null terminated address string. Must 
               
               
                   
                 Address2 
                 be the IP address in dot notation form 
               
               
                   
                   
                 (e.g. “12.5.138.7”) 
               
               
                 MD[q+1 . . . r] 
                 DNS IP 
                 Null terminated address string. Must 
               
               
                   
                 Address3 
                 be the IP address in dot 
               
               
                   
                   
                 notation form. 
               
               
                   
               
             
          
         
       
     
     Request DNS IP Addresses 
     Request the IP address(es) of the DNS servers and the domain name of a device. 
     
       
         
               
               
               
             
           
               
                   
               
               
                 Field 
                 Value(s) 
                 Description 
               
               
                   
               
             
             
               
                 MC 
                 0x020A 
                 Requests the device&#39;s DNS IP Address List 
               
               
                   
               
             
          
         
       
     
     Get DNS IP Addresses 
     Get the IP address(es) of the DNS servers and the domain name. 
     
       
         
               
               
               
             
           
               
                   
               
               
                 Field 
                 Value(s) 
                 Description 
               
               
                   
               
             
             
               
                 MC 
                 0x020B 
                 Get DNS IP Address 
               
               
                 MD[1 . . . n] 
                 Domain Name 
                 Null terminated name string. This 
               
               
                   
                   
                 name gets appended to names without 
               
               
                   
                   
                 a dot. Example, “panja.com” 
               
               
                 MD[n+1 . . . p] 
                 DNS IP 
                 Null terminated address string. Must 
               
               
                   
                 Address1 
                 be the IP address in dot notation form 
               
               
                   
                   
                 (e.g. “192.168.25.5”) 
               
               
                 MD[p+1 . . . q] 
                 DNS IP 
                 Null terminated address string. Must 
               
               
                   
                 Address2 
                 be the IP address in dot notation form 
               
               
                   
                   
                 (e.g. “12.5.138.7”) 
               
               
                 MD[q+1 . . . r] 
                 DNS IP 
                 Null terminated address string. Must 
               
               
                   
                 Address3 
                 be the IP address in dot 
               
               
                   
                   
                 notation form. 
               
               
                   
               
             
          
         
       
     
     Set Ethernet IP Address 
     Set the IP address, subnet mask, and gateway of the unit&#39;s Ethernet interface. A NULL must be provided for empty entries. 
     
       
         
               
               
               
             
           
               
                   
               
               
                 Field 
                 Value(s) 
                 Description 
               
               
                   
               
             
             
               
                 MC 
                 0x020C 
                 Set Ethernet IP Address 
               
               
                 MD[1] 
                 Flags 
                 Bit field: 
               
               
                   
                   
                 Bit 0 - If set, use DHCP for IP 
               
               
                   
                   
                 address and subnet mask. The IP 
               
               
                   
                   
                 address and subnet mask fields must 
               
               
                   
                   
                 be supplied, but are ignored. 
               
               
                   
                   
                 Bit 1 - Unused. 
               
               
                   
                   
                 Bit 2 - Unused. 
               
               
                   
                   
                 Bit 3 - Unused. 
               
               
                   
                   
                 Bit 4 - Unused. 
               
               
                   
                   
                 Bit 5 - Unused. 
               
               
                   
                   
                 Bit 6 - Unused. 
               
               
                   
                   
                 Bit 7 - Unused. 
               
               
                 MD[2 . . . n] 
                 Host Name 
                 Null terminated host name string. (e.g. 
               
               
                   
                   
                 “NetLinx1”) 
               
               
                 MD[n+1 . . . p] 
                 IP Address 
                 Null terminated address string. Must be 
               
               
                   
                   
                 the IP address in dot notation form (e.g. 
               
               
                   
                   
                 “192.168.26.26”) 
               
               
                 MD[p+1 . . . q] 
                 Subnet Mask 
                 Null terminated address string. Must be 
               
               
                   
                   
                 the IP address in dot notation form (e.g. 
               
               
                   
                   
                 “255.255.255.0”) 
               
               
                 MD[q+1 . . . r] 
                 Gateway 
                 Null terminated address string. Must be 
               
               
                   
                   
                 the IP address in dot notation form (e.g. 
               
               
                   
                   
                 “192.168.26.2”). 
               
               
                   
               
             
          
         
       
     
     Request Ethernet IP Address 
     Request the device&#39;s Ethernet interface IP address, subnet mask, and gateway of the unit&#39;s Ethernet interface. The response to this message is the Get Ethernet IP Address message. 
     
       
         
               
               
               
               
             
           
               
                   
                   
               
               
                   
                 Field 
                 Value(s) 
                 Description 
               
               
                   
                   
               
             
             
               
                   
                 MC 
                 0x020D 
                 Request Ethernet IP Address 
               
               
                   
                   
               
             
          
         
       
     
     Get Ethernet IP Address 
     Get the IP address, subnet mask, and gateway of the unit&#39;s Ethernet interface. 
     
       
         
               
               
               
             
           
               
                   
               
               
                 Field 
                 Value(s) 
                 Description 
               
               
                   
               
             
             
               
                 MC 
                 0x020E 
                 Get Ethernet IP Address 
               
               
                 MD[1] 
                 Flags 
                 Bit field: 
               
               
                   
                   
                 Bit 0 - It set, use DHCP for IP 
               
               
                   
                   
                 address and subnet mask. The IP 
               
               
                   
                   
                 address and subnet mask fields must 
               
               
                   
                   
                 be supplied, but are ignored. 
               
               
                   
                   
                 Bit 1 - Unused. 
               
               
                   
                   
                 Bit 2 - Unused. 
               
               
                   
                   
                 Bit 3 - Unused. 
               
               
                   
                   
                 Bit 4 - Unused. 
               
               
                   
                   
                 Bit 5 - Unused. 
               
               
                   
                   
                 Bit 6 - Unused. 
               
               
                   
                   
                 Bit 7 - Unused. 
               
               
                 MD[2 . . . n] 
                 Host Name 
                 Null terminated host name string. (e.g. 
               
               
                   
                   
                 “NetLinx1”) 
               
               
                 MD[n+1 . . . p] 
                 IP Address 
                 Null terminated address string. Must be 
               
               
                   
                   
                 the IP address in dot notation form (e.g. 
               
               
                   
                   
                 “192.168.25.5”) 
               
               
                 MD[p+1 . . . q] 
                 Subnet Mask 
                 Null terminated address string. Must be 
               
               
                   
                   
                 the IP address in dot notation form (e.g. 
               
               
                   
                   
                 “255.255.255.0”) 
               
               
                 MD[q+1 . . . r] 
                 Gateway 
                 Null terminated address string. Must be 
               
               
                   
                   
                 the IP address in dot notation form (e.g. 
               
               
                   
                   
                 “192.168.26.2”). 
               
               
                   
               
             
          
         
       
     
     Set Time and Date 
     Sets the Time and Date of the unit. 
     
       
         
               
               
               
             
           
               
                   
               
               
                 Field 
                 Value(s) 
                 Description 
               
               
                   
               
             
             
               
                 MC 
                 0x020F 
                 Set Time &amp; Date 
               
               
                 MD[1 . . . 2] 
                 Month 
                 Month (1-12) 
               
               
                 MD[3 . . . 4] 
                 Day of Month 
                 Day of Month (1-31) 
               
               
                 MD[5 . . . 6] 
                 Year 
                 Year (1999-2099) 
               
               
                 MD[7 . . . 9] 
                 Hours 
                 Hour (0-23) 
               
               
                 MD[9 . . . 10] 
                 Minutes 
                 Minute (0-59) 
               
               
                 MD[11 . . . 12] 
                 Seconds 
                 Seconds (0-59) 
               
               
                 MD[13 . . . 14] 
                 Day of Week 
                 Day of week (0-6) 0 = Sunday 
               
               
                   
               
             
          
         
       
     
     Request Current Time and Date 
     Request the device&#39;s current time and date. The response to this message is the Get Time and Date message. 
     
       
         
               
               
               
               
             
           
               
                   
                   
               
               
                   
                 Field 
                 Value(s) 
                 Description 
               
               
                   
                   
               
             
             
               
                   
                 MC 
                 0x0210 
                 Request Current Time and Date 
               
               
                   
                   
               
             
          
         
       
     
     Get Time and Date 
     Gets the devices time and date. 
     
       
         
               
               
               
             
           
               
                   
               
               
                 Field 
                 Value(s) 
                 Description 
               
               
                   
               
             
             
               
                 MC 
                 0x0211 
                 Get Time &amp; Date 
               
               
                 MD[1 . . . 2] 
                 Month 
                 Month (1-12) 
               
               
                 MD[3 . . . 4] 
                 Day of Month 
                 Day of Month (1-31) 
               
               
                 MD[5 . . . 6] 
                 Year 
                 Year (1999-2099) 
               
               
                 MD[7 . . . 8] 
                 Hours 
                 Hour (0-23) 
               
               
                 MD[9 . . . 10] 
                 Minutes 
                 Minute (0-59) 
               
               
                 MD[11 . . . 12] 
                 Seconds 
                 Seconds (0-59) 
               
               
                 MD[13 . . . 14] 
                 Day of Week 
                 Day of week (0-6) 0 = Sunday 
               
               
                   
               
             
          
         
       
     
     Restart 
     Restart the device or a subset of the device. 
     
       
         
               
               
               
             
           
               
                   
               
               
                 Field 
                 Value(s) 
                 Description 
               
               
                   
               
             
             
               
                 MC 
                 0x0212 
                 Restart 
               
               
                 MD[1 . . . 2] 
                 Flag 
                 This field has the following enumerated 
               
               
                   
                   
                 meanings: 
               
               
                   
                   
                 0 - Device reboot. The device should 
               
               
                   
                   
                 perform the “coldest” boot possible. 
               
               
                   
                   
                 1 - NetLinx restart. Shutdown and restart 
               
               
                   
                   
                 the NetLinx interpreter. 
               
               
                   
                   
                 65535 - Smart reboot. The device should 
               
               
                   
                   
                 perform the necessary steps to activate any 
               
               
                   
                   
                 previous configuration parameters. 
               
               
                   
                   
                 Including, but not limited to, “cold” 
               
               
                   
                   
                 rebooting the device. For example, if the 
               
               
                   
                   
                 IP address configuration has changed, 
               
               
                   
                   
                 and a reboot is required to begin using 
               
               
                   
                   
                 the new IP, then the device should reboot. 
               
               
                   
               
             
          
         
       
     
     Completion Code 
     Indicates successful/unsuccessful completion of a previous message. In the case where the device settings, such as device number, are being modified, the completion code message is generate using the “old” device information before the new settings take effect. 
     
       
         
               
               
               
             
           
               
                   
               
               
                 Field 
                 Value(s) 
                 Description 
               
               
                   
               
             
             
               
                 MC 
                 0x0213 
                 Completion Code 
               
               
                 MD[1 . . . 2] 
                 .wMessage 
                 The message code (not Message ID) of 
               
               
                   
                   
                 the message (command) that is 
               
               
                   
                   
                 completed. For example, when a Set 
               
               
                   
                   
                 Ethernet IP Address message has 
               
               
                   
                   
                 been processed by a device, the 
               
               
                   
                   
                 device responds with a Completion 
               
               
                   
                   
                 Code message with wMessage set 
               
               
                   
                   
                 to 0x020C. 
               
               
                 MD[3] 
                 bStatus 
                 Bit field indicating success or failure of 
               
               
                   
                   
                 the specified message: 
               
               
                   
                   
                 Bit 0: 0 = Failed, 1 = success 
               
               
                   
                   
                 Bits 1-7 must be zero. 
               
               
                   
               
             
          
         
       
     
     Set Identify Mode/Address Response 
     Indicates that the device has received the Identify Mode/Address Enable and has had a button pressed on the device to indicate it should take on the ID Mode device and system number. 
     
       
         
               
               
               
             
           
               
                   
               
               
                 Field 
                 Value(s) 
                 Description 
               
               
                   
               
             
             
               
                 MC 
                 0x0282 
                 Set Identify mode/address response 
               
               
                 MD[1 . . . 2] 
                 Old Device 
                 Unsigned 16-bit value. Old device number. 
               
               
                 MD[3 . . . 4] 
                 Old System 
                 Unsigned 16-bit value. Old system number. 
               
               
                   
               
             
          
         
       
     
     IP Port Connection Manager 
     The following messages originate from or are destined for the IP Port Connection Manager: 
     
       
         
               
               
               
             
           
               
                   
               
               
                 Command 
                 Value 
                 Description 
               
               
                   
               
             
             
               
                 ReqIPConnection 
                 0x0381 
                 Requests an IP connection. 
               
               
                 (Device-&gt;Master) 
               
               
                 Request IP 
                 0x0382 
                 Requests the status of an active or 
               
               
                 Connection Status 
                   
                 pending connection. 
               
               
                 (Device-&gt;Master) 
               
               
                 IP Connection 
                 0x0303 
                 Indicates the current status of a 
               
               
                 Status 
                   
                 connection or connection request. 
               
               
                 (Master-&gt;Device) 
                   
                 Indicates: success, failure, unexpected 
               
               
                   
                   
                 closing, Host terminated connection, etc. 
               
               
                 Authenticate 
                 0x0304 
                 This message is the challenge that is sent 
               
               
                 Connection 
                   
                 to the client device. 
               
               
                 (From Master) 
               
               
                 Authentication 
                 0x0385 
                 Encrypted challenge response from the 
               
               
                 Response 
                   
                 client. 
               
               
                 (To Master) 
               
               
                 Connection 
                 0x0306 
                 Status hack to the client regarding the 
               
               
                 Granted/Failed 
                   
                 connection. 
               
               
                 (From Master) 
               
               
                   
               
             
          
         
       
     
     The included message protocol and its packet are designed to be sent independent of any transport protocol. Thus, this message can be sent by a TCP/IP protocol over any connection or by a lontalk protocol, which is based on the phastlink protocol developed by Panja, Inc. This protocol can also be carried over on RS232/PPP connections. This protocol supports master to master, PC to master and PC to device communication. 
     Communication components are usually represented using the seven-layer ISO model. Operating Systems such as Windows NT/9x provide most of these layers with a powerful object oriented abstraction at the application layer. Under Windows, at the application layer, the software developer is presented with a Berkley Sockets interface. With this interface, the developer can establish two-way communication using an object known as a “Socket”. Applications can choose to be clients or servers. Though this is a powerful abstraction, there is no facility to help the application developer formulate a protocol in terms of the packets of information sent back and forth on the wire. The services that are available deal with namespace resolution and sending and receiving of blocks of binary data. Typically, the client and server portions of the application are written to understand each other&#39;s messages on the wire. The messages consist of structures of binary information. To formulate such messages, the developer usually has to program in a low-level language such as C or C++. 
     The Internet has given rise to a whole new species of developers called “Web developers”. On an average, they are not low-level programmers who can code in C or C++and instead use some combination of HTML, Java, JavaScript and VBScript. Except for the full Java language, the other languages are “scripting languages”. 
     They do not provide the developer with services and facilities of a full programming language. 
     The primary goal of the Panja dynamic messaging components invention is to make a scripting language such as VBScript or JavaScript (or even Visual Basic) capable of directly communicating on any TCP/IP network connection. This means that these dynamic messaging components have to give the script writer the ability to: (i) form binary messages and transmit them on a network connection; and (ii) receive binary messages from a network connection, understand their format and “unpack” them to extract individual fields in the message. As explained later in this document, it will be seen that apart from these two basic requirements, current communication protocols require more complex features that these components now provide. 
     To meet the primary goal explained above, the dynamic messaging components were chosen to be implemented using the Microsoft Component Object Model or COM. This is primarily because presently no other programming model allows a scripting language to use self-describing objects with such ease of use. COM objects are well-understood by the developer community and the model is mature and stable. However, other suitable programming models may be used if desired. 
     To effect the requirements enumerated above, three distinct objects or components are provided. They include a binary message descriptor/layout manager object, a message instance object that represents one network message, and a transport object that manages the buffered network transmission issues. 
     The message descriptor/layout manager object allows a script to define the structure of binary messages that represent packets of information sent back and forth on a network connection. The message structures are identified using unique names. Once defined, these structures can later be used to form instances of messages or define more complex structures, which contain embedded structures in them. Referring to FIG. 11 for an example of the message descriptor/layout manager object, which includes a binary message structure 700 that may be sent or received according to the communication protocol. The packet structure includes a message header structure that is an embedded structure within the message. The message header includes a packet protocol identifier (2 bytes)  702 , a packet size in bytes (4 bytes)  703 , a packet version (2 bytes)  704 , and a packet type (2 bytes)  705 . Message structure  700  further includes a message body, which contains data according to the message type. For example, the message body may include an element 1 (2 bytes)  705 , an element 2 (a variable length element whose size is specified by element 1)  707 , and an element 3 which is a NULL terminated string. 
     To further describe this message structure, two additional message structures are defined: the message header and the entire message. The entire message contains the header structure as an embedded structure within itself. The following pseudo-code shows the general format of the description: 
     
       
         
               
               
             
               
               
             
               
               
             
               
               
             
               
               
             
           
               
                   
                   
               
             
             
               
                   
                 LayoutManager = CreateObject(“LayoutManager”) 
               
               
                   
                 LayoutManager.BeginDefineLayout(“PacketHeader”) 
               
             
          
           
               
                   
                 LayoutManager.AddPrimitive(“SHORT”, “Protocol”) 
               
               
                   
                 LayoutManager.AddPrimitive(“LONG”, “PacketSize”) 
               
               
                   
                 LayoutManager.AddPrimitive(“SHORT”, “PacketVersion”) 
               
               
                   
                 LayoutManager.AddPrimitive(“SHORT”, “PacketType”) 
               
             
          
           
               
                   
                 LayoutManager.EndDefineLayout( ) 
               
               
                   
                 LayoutManager.BeginDefineLayout(“HelloWorldPacket”) 
               
             
          
           
               
                   
                 // message header 
               
               
                   
                 LayoutManager.AddStruct(“PacketHeader”, “Header”) 
               
               
                   
                 // message body 
               
               
                   
                 LayoutManager.AddPrimitive(“SHORT”, “Elementl”) 
               
               
                   
                 LayoutManager.AddPrimitiveDynamicArray(“CHAR”, 
               
               
                   
                 “Element2”, “Element1”) 
               
               
                   
                 LayoutManager.AddSZString( “Element3”) 
               
             
          
           
               
                   
                 LayoutManager.EndDefineLayout( ) 
               
               
                   
                   
               
             
          
         
       
     
     The operations (methods) that the layout manager provides allow a script to define the individual components of a binary message. The operations generally take the form: 
     
       
         
               
               
             
               
             
           
               
                   
                   
               
             
             
               
                   
                 &lt;Object&gt;.&lt;Operation Name&gt; (&lt;Element Type&gt;, &lt;Element Name&gt;, 
               
             
          
           
               
                 &lt;Other Arguments . . . &gt;) 
               
               
                   
               
             
          
         
       
     
     For example, to add the “PacketSize” element to the message, the “AddPrimitive” operation is used. The element type is specified as “LONG” meaning it is an integer 4 bytes in size. Adding elements to a message has to be done within a “BeginDefineLayout-EndDefineLayout” pair of operations. This indicates to the layout manager when a new message structure definition begins and ends. Once a message structure is defined completely, it may be used as an element type in further message definitions. In the example above, the “AddStruct” operation was used to make “Packet Header Structure” an element in the structure definition of message “Packet Type 1”. Embedding structures within structures allows for definition of very complex messages. 
     The example also illustrated yet another important concept. This is the ability to define variable length elements within a message structure. The element named “element 2” is of variable length. It is a byte (char) array whose length is specified within the message by the preceding element named “element 1”. Dynamically sized elements of this type are pretty common in many communication protocols. 
     Due to their very nature, some dynamically sized elements do not have to have an explicit element specify their size. An example of such an element type is a NULL terminated string. A NULL terminated string is a sequence of bytes in which the byte value of 0 is a special value indicating the end of the sequence. Since the end of the sequence is specified by this special value, its length does not have to be explicitly stored. The example shows that “element 3” is a NULL terminated string and the operation “AddSZString” is used to add it. 
     The following examples enumerate the operations (methods) provided by the layout manager. 
     Message Descriptor/Layout Manager Object Methods 
     BeginDefineLayout—starts definition of a new message (cannot be called while already defining a message). 
     EndDefineLayout—ends definition of a current message (cannot be called if not currently defining a message). 
     IsDefinedLayout—checks for existence of a message definition and returns TRUE/FALSE. 
     AddPrimitive—adds a primitive element to a message structure. Primitive elements form the basic entities of a binary message. Primitive elements includes characters (1 byte), 2 byte integers, 4 byte integers, floating point numbers (4 bytes) and double precision floating point numbers (8 bytes). 
     AddPrimitiveArray—adds an array of primitive elements to a message structure. 
     AddPrimitiveDynamicArray—adds a dynamic array of primitive elements to a message structure. The array does not have to be fixed in size, rather, the name of another (integer type) element is used to contain the actual length of this element inside a specific instance of this message structure. The size element has to have been already defined within the message structure. In other words, the length of this dynamic element is specified by an element within the message and that element should be stored in a position physically above the dynamic element. 
     AddStruct—adds a structure element to a message structure. The structure element must already have been defined. 
     AddStructArray—adds an array of structure elements to a message structure. 
     AddStructDynamicArray—adds a dynamic array of structure elements to a message structure. The same rules as that of AddPrimitiveDynamicArray applies to this method. 
     AddSZString—adds a NULL terminated string element to a message structure. 
     AddSZStringArray—adds an array of NULL terminated string elements to a message structure. The array does not have to be fixed in length, rather, the last string element of the array has to be terminated with two NULL characters rather than one NULL character. 
     AddPadding—adds padding of specified byte amount to a message structure after an element. This method is used to align individual elements of a structure to be on specific byte boundaries. 
     AddAlignmentPadding—adds padding to a message structure after an element to align to the specified alignment boundary. Byte alignments can be made to occur on 2, 4, 8 or 16 byte boundaries. This method is used to align individual elements on specific byte boundaries when the element sizes are not fixed. The message instance object of the dynamic messaging component allows a script to create an instance of a previously defined message in memory, fill the message with values for the individual fields of the message, and then with the help of transport object (which is described in the next section), transmit the message over a network connection. The message instance object also allows a script to receive an instance of a message over a network connection, unpack the message and access the values of the individual elements in the message. 
     The message structure previously defined will be used again to show how an instance of that message could be created in memory. FIG. 12 illustrates an instance of the message whose structure was described in the previous section. Message  720  includes a message header that has the following exemplary values: packet protocol identifier=1 ( 722 ); packet size in bytes=23 ( 723 ); packet version=1 ( 724 ); and packet type=3 ( 725 ). The message body may contains the following elements: element 1=5 (size of following dynamic array in bytes) ( 726 ); element 2=[hello] (array of 5 characters) ( 727 ); and element 3=“world\0” (NULL\0 terminated string) ( 728 ). 
     The following pseudo-code shows a typical sequence in creating the message instance: 
     
       
         
               
             
               
             
               
               
             
               
             
               
               
             
               
             
               
               
             
               
             
           
               
                   
               
               
                 MessageInstance = CreateObject (“LayoutInstance”) 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 // (1) create message of type “HelloWorldPacket” -  
               
               
                 previously defined using Layout Manager 
               
               
                 MessageInstance.CreateMessage(“HelloWorldpacket”, FALSE) 
               
               
                 // (2) setup length of dynamic fields 
               
               
                 MessageInstance.SetDynamicArraySize(“Element2”, 
               
               
                 StringLength(“Hello”)) 
               
               
                 MessageInstance.SetSZStringLength(“Element3”, 0, 
               
               
                 StringLength   (“World”)) 
               
               
                 // (3) set values for elements 
               
               
                 MessageInstance.BeginSetLayout( ) 
               
             
          
           
               
                   
                 // setup message header fields 
               
               
                   
                 MessageInstance.SetInt2(“PacketHeader.Protocol”, 1) 
               
               
                   
                 MessageInstance.SetInt4(“PacketHeader.PacketSize”, 
               
             
          
           
               
                 MessageInstance.GetMessageSize( )) 
               
             
          
           
               
                   
                 MessageInstance.SetInt2(“PacketHeader.PacketVersion”, 1) 
               
               
                   
                 MessageInstance.SetInt2(“PacketHeader.PacketType”, 3) 
               
               
                   
                 // setup message body fields 
               
               
                   
                 MessageInstance.SetInt2(“Element1”, StringLength(“Hello”)) 
               
               
                   
                 // set dynamic array element (Element2) 
               
               
                   
                 MessageInstance.SetCharArray(“Element2”,  StringLength(“Hello”), 
               
             
          
           
               
                 “Hello”) 
               
             
          
           
               
                   
                 // set NULL terminated element (Element3) 
               
               
                   
                 MessageInstance.SetSZString(“Element3”, “World”) 
               
             
          
           
               
                 MessageInstance.EndSetLayout( ) 
               
               
                   
               
             
          
         
       
     
     In the pseudo-code above, a message instance object is created which is then used to set the various values for the elements within the message. The code to actually transmit the message is described below. 
     The first operation performed is the “CreateMessage” operation. This operation allows a script to create a message of a given type. The message type is previously defined within this (or some other) script using the message descriptor/layout manager object. The meaning of the second boolean argument (FALSE in this case) is explained below. Following the creation of the message, two operations are performed to set the lengths of the two dynamic fields within the message. The two fields are “element 2” and “element 3”. “element 2” is a dynamic array of characters and “element 3” is a NULL terminated string. After a message is created, sizes of all dynamic elements within the message have to be specified because that is how the Message Instance object knows how much memory this message will occupy. If there are no dynamic elements in the message, this step can be completely avoided. 
     The third step is actually setting the values of the various fields (elements) in the message. In this message, there are two parts: header and body. The various operations supported by the Message Instance object provide scripts extreme flexibility in writing values of elements into a message. In this instance, methods like “SetInt2”, “SetInt4”, “SetCharArray” and “SetSZString” are used. Also, once all dynamic elements have been explicitly sized, the Message Instance object knows what the entire size of the message is, so the “GetMessageSize” operation can be used to get the size. This operation is used in writing the message size into the “PacketSize” element of the header. The sequence of set operations has to be enclosed within a pair of “BeginSetLayout-EndSetLayout” operations so that the Message Instance knows when a message is ready to be transmitted. 
     Now that a complete example of a message instance has been illustrated, the following section enumerates all the operations (methods) provided by the Message Instance. 
     The message/layout instance object includes the following methods: 
     CreateMessage—creates an instance of a message, given its type. Optionally, this method can be used to transform a message of one type to another type. 
     SetDynamicArraySize—sets the size of a dynamic element inside a message. 
     SetSZStringLength—sets the length of a NULL terminated string. The string may be by itself an element in the message or could be part of a string array. 
     SetSZStringArraySize—sets the size of an array of strings in a message. 
     BeginSetLayout—notifies the message instance object that “Set” methods are about to be called which will write values to individual elements within the message. 
     SetChar—sets the value of a single byte (char) element. 
     Setlnt2 —sets the value of a 2-byte integer (short) element. 
     SetInt4 —sets the value of a 4-byte integer (long) element. 
     SetFloat—sets the value of a floating point (4 byte) element. 
     SetDouble—sets the value of a double precision floating point (8 byte) element. 
     SetCharArray—copies an array of characters into an element. 
     SetSZString—copies a string into the NULL terminated string element. 
     EndSetLayout—notifies the Message Instance object that the message should now readied for transmission as all the individual element values have been set. 
     BeginGetLayout—notifies the Message Instance object that the message should be un-packaged so that individual elements can be “read” out of it. 
     GetChar—returns the value of a single byte (char) element. 
     GetInt2—returns the value of a 2-byte integer (short) element. 
     Getlnt4—returns the value of a 4-byte integer (long) element. 
     GetFloat—returns the value of a floating point element. 
     GetDouble—returns the value of a double precision element. 
     GetCharArray—returns an array of chars from an char array element. 
     GetSZStringLength—returns the size of a NULL terminated string element in the message. 
     GetSZStringArraySize—returns the size of a string array in the message. 
     GetSZString—returns a string from the message. 
     EndGetLayout—notifies the Message Instance object that the script is done “reading” values out of the message. 
     ClearData—clears any message instance data within the object. 
     GetMessageSize—returns the size (in bytes) of the entire message instance. 
     Send—using an instance of the transport object, streams the message instance over a network connection. 
     Receive—using an instance of the transport object, receives a message instance from a network connection. 
     SetConvert—sets network to host and host to network byte swapping transformation mode. In this mode, all incoming messages are assumed to be in network format and all outgoing messages are converted to network format. 
     Pushback—allows for message overflow/underflow. When an incoming message is partially formed or contains more than a full message, the partial message bytes can be “pushed” back into the transport object which can be retrieved later. 
     Message layout and message instance creation are set forth above. The final step in network connectivity is the actual transport. Message layout and message instancing are actions that give rise to blocks of bytes in the memory of the web server (or wherever the script is being executed). To be able to communicate on a network, a live connection has to be made to be able to send and receive data. The third object inside the Panja dynamic messaging components module is a transport object implemented specifically to handle TCP/IP networks. The two previous objects do not in anyway assume what kind of a network connection they are communicating over. The transport object&#39;s interface is specified independent of the nature of the network. The transport object has a built-in asynchronous message handler that can fire scripts when messages arrive outside of a script&#39;s “Receive” method call. 
     Examples of the transport object methods includes: 
     Connect—connects to a given remote computer given its network address and end-point (port). 
     Close—closes an existing connection. 
     GetLastSocketError—returns the last error that occurred on the network connection. 
     SetScriptPath—Sets the path of the script that will be executed on incoming asynchronous messages. 
     DisableAsyncHandler—during some operations, it is desirable not to have the asynchronous message processor fire external scripts—this method allows a script to disable the asynchronous message processor, during which time all incoming messages are buffered up. 
     EnableAsyncHandler—enables the asynchronous message processor—from this point onward, every incoming asynchronous message will result in an external script being executed. 
     IsConnected—returns whether the transport object is connected to a remote computer or not. 
     GetHost—returns the network address of the remote computer to which the transport object is currently connected. 
     GetPort—returns the port on the remote computer to which the transport object is currently connected. 
     The sequence of operations to create and send a message instance is given in the exemplary pseudo-code below: 
     
       
         
               
             
               
               
             
               
             
               
               
             
               
             
               
               
             
               
             
           
               
                   
               
             
             
               
                 // create a transport object and connect it to a remote computer 
               
               
                 Transport = CreateObject(“Transport”) 
               
               
                 Transport.Connect(“abc.com”, 10000) 
               
               
                 MessageInstance = CreateObject(“LayoutInstance”) 
               
               
                 // create message of type “HelloWorldPacket” - previously defined using 
               
               
                 Layout Manager 
               
               
                 MessageInstance.CreateMessage(“HelloWorldPacket”, FALSE) 
               
               
                 // setup length of dynamic fields 
               
               
                 MessageInstance.SetDynamicArraySize(“Element2”, 
               
               
                 StringLength(“Hello”)) 
               
               
                 MessageInstance.SetSZStringLength(“Element3”, 0, 
               
               
                 StringLength (“World”)) 
               
               
                 // set values for elements 
               
               
                 MessageInstance.BeginSetLayout ( ) 
               
             
          
           
               
                   
                 // setup message header fields 
               
               
                   
                 MessageInstance.SetInt2(“PacketHeader.Protocol”, 1) 
               
               
                   
                 MessageInstance.SetInt4(“PacketHeader.PacketSize”, 
               
             
          
           
               
                 MessageInstance.GetMessageSize( )) 
               
             
          
           
               
                   
                 MessageInstance.SetInt2(“PacketHeader.PacketVersion”, 1) 
               
               
                   
                 MessageInstance.SetInt2(“PacketHeader.PacketType”, 3) 
               
               
                   
                 // setup message body fields 
               
               
                   
                 MessageInstance.SetInt2(“Element1”, StringLength(“Hello”) 
               
               
                   
                 // set dynamic array element (Element2) 
               
               
                   
                 MessageInstance.SetCharArray(“Element2”,  StringLength(“Hello”), 
               
             
          
           
               
                 “Hello”) 
               
             
          
           
               
                   
                 // set NULL terminated element (Element3) 
               
               
                   
                 MessageInstance.SetSZString(“Element3”, “World”) 
               
             
          
           
               
                 MessageInstance.EndSetLayout( ) 
               
               
                 // transmit message instance using the transport object “Transport” 
               
               
                 MessageInstance.Send(Transport) 
               
               
                   
               
             
          
         
       
     
     The dynamic messaging components are used in the communication between the ASP-based web server and the Internet appliance server. The various web pages that deal with controlling and administering the Internet appliance server use these objects to create and send TCP/IP messages to the IA server. 
     Although several embodiments of the present invention and their advantages have been described in detail, it should be understood that mutations, changes, substitutions, transformations, modifications, variations, and alterations can be made therein without departing from the teachings of the present invention, the spirit and scope of the invention being set forth by the appended claims.