Abstract:
A method of configuring a lock system comprising a plurality of lock system devices comprises the following steps: defining a plurality of command and status messages, wherein each of the messages has a specific function when received by a device, defining a plurality of device types, wherein each of the types can send predetermined command and status messages, sending a claiming message from each device, wherein the claiming message from a specific device comprises information relating to the predetermined messages that the specific device can send, and storing, in each of the devices, the information relating to the predetermined messages that every other device can send. By this method, a simple lock system can be set up without involvement of the person installing the system. A lock system and a lock system device using this method are also provided.

Description:
FIELD OF INVENTION 
   The present invention relates generally to lock systems and more particularly to a self-configuring lock system comprising a plurality of different units, such as electronic or electro-mechanical locks, card readers, exit buttons, door openers etc. 
   BACKGROUND 
   Electronic and electro-mechanical lock systems are becoming increasingly complex. Besides the lock device itself, such as a lock cylinder, a lock system comprises auxiliary devices, such as sensors, panic bars, emergency power supplies etc. Many systems involve two doors with lock devices, like a pair door or a pair of interlocking doors used for e.g. security or climate control. 
   The interfacing between the different devices in a lock system is complex and requires installation by a person skilled not only in the technical field of locks but also in the field of electronics. The devices can be provided with different kinds of inputs/outputs and the function thereof differs from device to device. 
   One common way to configure an electronic lock system is to connect all devices to a common master unit, such as a computer. All devices are assigned a specific address by setting mechanical switches in positions corresponding to a desired address. By means of the master unit, the entire system can be set up so as to operate in a desired manner. However, this approach requires two installation steps, a first step wherein the devices are installed and wired, and a second step wherein the system is configured. Also, often two different persons are involved in the installation. A further drawback with this approach is that one wrong setting of switches can lead to time consuming searches for faults in the system. 
   SUMMARY OF THE INVENTION 
   An object of the present invention is to provide a self-configuring lock system wherein the prior art drawbacks are avoided and which requires no programming of the devices involved. Thus, an object is to simplify cabling through a wire system and to make the door environments to which it is applied easy to understand for the installer. 
   Another object of the present invention is to provide a self-configuring lock system wherein there is no central master unit. 
   The invention is based on the realisation that a self-configuring lock system can be provided by defining a number of allowed commands and having all devices send out claiming messages wherein the commands that can be transmitted by the different devices are negotiated. 
   According to the invention there are provided a method of configuring an electronic lock system as defined in claim  1 . An electronic lock system device as defined in claim  8  and a lock system as defined in claim  10  are also provided. 
   By providing a lock system, wherein at start-up each connected device sends out a claiming message containing a list of commands that the device in question can send, a command matrix is created in every device. These matrixes are used to control the flow of commands in the lock system so as to create a functioning self-configuring electronic lock device system. 
   In a particularly preferred embodiment, the claiming messages are used for assigning different addresses to the devices connected to the system. Thereby, no setting of switches etc. is required during installation. 
   In another preferred embodiment, devices of the same product type are assigned to different device groups whereby a self-configuring two-door system is made possible. 
   Further preferred embodiments are defined by the dependent claims. 

   
     BRIEF DESCRIPTION OF DRAWINGS 
     The invention is now described, by way of example, with reference to the accompanying drawings, in which: 
       FIG. 1  is an overall view of a door comprising a typical electronic lock system, 
       FIG. 2  is a block diagram showing connection between the different devices shown in  FIG. 1 , 
       FIG. 3  is a block diagram showing the configuration of a lock system device according to the invention, 
       FIG. 4  shows the functional device connection of the system shown in  FIG. 1 , 
       FIG. 5  shows the structure of a claiming message according to the invention, 
       FIG. 6  is a flow chart of the major steps of the method according to the invention, 
       FIG. 7  is an overall view of a lock system comprising two related doors, and 
       FIG. 8  is a block diagram showing the functional device connection of the devices comprised in the system of FIG.  7 . 
   

   DETAILED DESCRIPTION OF THE INVENTION 
   In the following a detailed description of preferred embodiments of the present invention will be given. 
   In the present context, interconnectivity in a lock system between different devices means to enable simple connection of devices installed at a door. In most applications, a lock system or an environment comprises one or two doors. When the system comprises two doors it should be considered only doors with some kind of dependence, like a pair door or a pair of interlocking doors used for e.g. security or climate control. 
   In the present description, the term “lock system device” or simply “device” is intended to cover all types of devices comprised in an electronic lock system, such as card readers, panic buttons etc., and is thus not limited to devices comprising the lock itself. 
   A simple electronic lock system will now be described with reference to  FIG. 1 , showing a one-door system, generally designated  1 . In a door  2 , there is provided an electronic lock  10  of a kind conventionally found in electronic lock systems. By electronic lock is meant any kind of electrically actuated and controlled lock device including electro-mechanical locks. The lock is controlled by means of a card reader  20  installed on the outside of the door. On the inside there is provided an exit button  30  used by a person on the inside of the door for unlocking the same. 
   The movement of the door between opened and closed positions is controlled by means of a door operator  40  with an integrated motion sensor. All devices shown in  FIG. 1  are interconnected by means of a two-wire cabling making up a bus  90 . This is shown in  FIG. 2 , which is a block diagram showing all the devices comprised in the lock system of FIG.  1 . As is evident from  FIG. 2 , there is no central “master” unit in the system as is usually found in conventional electronic lock systems. Instead all devices set up themselves so as to provide an interconnected system. This is made possible by the interconnectivity provided by the present invention, as will be described below. 
   Most devices in a lock system according to the invention have different functions. However, they all have a common hardware and software structure which will be described below. 
   In  FIG. 3 , there is shown a lock system device, indicated by the dashed line and generally designated  100 . 
   The device comprises a single chip micro controller  102  connected to a bus transceiver  103  arranged to be connected to the bus  90  shown in FIG.  2 . The micro controller  102  is powered by means of a power supply  104  arranged as an external supply connected to the device supplying a voltage of 12 or 24 VDC. 
   The micro controller itself contains some kind of electronic memory, such as a Read only memory (ROM). However, a non-volatile memory  106  is connected to the micro controller for storage of non volatile data, such as system operational parameter data and/or diagnostic data. There is also provided a switch  107  for indicating whether the device belongs to either or both of two defined device groups, as will be explained in detail below with reference to  FIGS. 6 and 7 . 
   Further elements, such as a key pad  108  or a light indicator  109  can also be provided in the device  100 . 
   Devices can be in one of two different modes: pre-operational mode and operational mode. When a device is connected to the power supply, a boot-up sequence is initiated, wherein it is in the pre-operational mode. After the boot-up sequence is completed, the device has been put into operational mode. 
   In a network of devices of the kind described herein, every device must have a unique node identification (node ID) before operational stage. Because there is no central unit taking care of the configuration of the system, all devices identify themselves during the boot-up sequence and this identification includes an address claiming procedure wherein all devices connected to the system are assigned a unique address. The address claiming procedure is performed in any convenient way and the exact way it is performed constitutes no part of the present invention. However, in order for the procedure to operate correctly, each device must have a unique serial number stored in memory. 
   A lock system can be classified either as very simple or as simple. As long as only one device of each product type is used, the system is very simple and all devices belong to one group. The group concept will be described further below with reference to  FIGS. 6 and 7 . A simple system comprises two devices of at least one product group and these devices must be distinguished by allocating them to different groups. A very simple or simple system will always configure itself according to some basic rules. 
   Lock system devices are divided into three different device classes: activators, actuators, and sensors. 
   An activator is any device that sends commands to an actuator. Examples of an activator can be an exit push button, card reader, panic exit button etc. The activator is also responsible for the access related timing of a lock system. 
   An actuator is a device that performs an action, usually some kind of mechanical activity like releasing a clutch or opening a door. It can also be a buzzer or flashlight. Some actuators need to send access commands, see below, and are thus also activators. 
   A sensor provides no access related information, only sensor status information. An example thereof is a door operator safety switch. 
   In the example above the electronic lock  10  and the door operator  40  are actuators while the card reader  20  and the exit button  30  are activators. 
   The functional device connections of the system shown in  FIG. 1  will now be described with reference to  FIG. 4 , wherein “Activator  1 ” corresponds to the card reader  20 , “Activator  2 ” corresponds to the exit button  30 , “Actuator  1 ” corresponds to the lock  10 , and “Actuator  2 ” corresponds to the door operator  40 . 
   A device can not receive data from another device if there is no logical connection therebetween (as opposed to the physical connections shown in FIG.  2 ). A logical connection is in essence a “decision” to receive messages from an already known device on the bus. During the address claiming procedure during the pre-operational stage, each device on the bus will decide what other devices to establish logical connections to. The claiming device will send a message matrix in the claiming message. Thus the other devices on the bus can decide which commands and status messages to respond to. 
   The logical connections in  FIG. 4  are represented by arrows indicating the direction of allowed messages carried through the connection in question. It is seen that the activators can send but not receive messages while the actuators can both send and receive messages. 
   In  FIG. 4 , Actuator  1  has set up logical connections to all the other devices, i.e., three connections. Each connection can carry a number of different messages. There are specific rules to define which messages to respond to and which to discard. For example, a lock device, i.e., Actuator  1  in  FIG. 3 , will discard an “Id device event” message and accept an “Unlock” message. Messages will be explained in more detail in the following. 
   All messages are listed below. The assigned message index value is unique and the messages are related to specific devices. Any device can send any message, but not all devices will listen; this is controlled by the device configuration. 
   The messages are divided into two categories: command and status messages, wherein commands messages have a message index range of 0-127 and status messages have a message index range of 128-255. These messages are shown in tables 2 and 3 below. 
   The structure of a claming message is shown in FIG.  5 . It carries 32 bits describing which messages can be sent from that device. These 32 bits are divided into 16 bits for the command messages and 16 bits for status messages. 
   It has been mentioned above that a claiming message is sent by each device during the address claiming procedure. Inside this claiming message there are additional attributes to identify the functionality of the claiming device. 
   Data1 
   This is the Node ID of the claiming device. 
   Data2—Attributes 
   In the attributes there is the position of the group switch. If the device is configured to be a multi-group device this should be reflected in the claiming message. Attributes are shown in table 1 below. 
   
     
       
             
           
             
             
             
             
           
         
             
               TABLE 1 
             
           
           
             
                 
             
             
               Attributes 
             
           
        
         
             
               Bit 
               Attribute 
               Value 
               Comment 
             
             
                 
             
             
               0-1 
               Group 
               0 = Not Used 
               Status of group switch of the 
             
             
                 
               Switch 
               1 = Group 1 
               claiming device. 
             
             
                 
                 
               2 = Group 2 
               Status of the multi-group 
             
             
                 
                 
               3 = Group 1 + 
               setting. 
             
             
                 
                 
               Group 2 
             
             
               2 
               Master 
               0 = Not NMT master 
               The claiming device claims 
             
             
                 
                 
               1 = This is NMT 
               NMT master function in the 
             
             
                 
                 
               master 
               system (handled by API). 
             
             
               3 
               Sub- 
               0 = No sub-devices 
               Indicates if the claiming 
             
             
                 
               device 
               follow 
               device is claiming a sub- 
             
             
                 
                 
               1 = Sub-devices 
               device address. 
             
             
                 
                 
               follow 
             
             
               4-7 
               Reserved 
               0 
               Not used. 
             
             
                 
             
           
        
       
     
   
   The use of the group switch will be explained further below with reference to  FIGS. 6 and 7 . 
   Data3-4—Command Matrix 
   This is a binary array, representing up to 16 control messages that the claiming device can send. If the bit value is “1” then corresponding message can be sent. 
                                     TABLE 2                   Command Matrix                    Message               Bit   index   Message text                       0   0   Emergency Command           1   1   Emergency Control Command           2   2   Door Control Command           3   3   Inhibit Command           4   4   Identification Device Control Command           5-15   5-127   Not used (set to 0).                        
Data5-6—Status Matrix
 
   This is a binary array, representing up to 16 status messages that the claiming device can send. If the bit value is “1” then corresponding message can be sent. 
   
     
       
             
           
             
             
             
             
           
         
             
               TABLE 3 
             
           
           
             
                 
             
             
               Status Matrix 
             
           
        
         
             
                 
                 
               Message 
                 
             
             
                 
               Bit 
               index 
               Message text 
             
             
                 
                 
             
             
                 
               0 
               128 
               Locking Device Status 
             
             
                 
               1 
               129 
               General Device Status 
             
             
                 
               2 
               130 
               Debug Status 
             
             
                 
               3 
               131 
               Exit Device Counter 
             
             
                 
               4 
               132 
               Door Operator Status, Revolving door 
             
             
                 
                 
                 
               status 
             
             
                 
               5 
               133 
               Identification Device tag data. 
             
             
                 
               6 
               134 
               Identification Device event. 
             
             
                 
               7 
               135 
               System Power Status 
             
             
                 
               8 
               136 
               System Temperature Sensor Status 
             
             
                 
               9-15 
               137-255 
               Not Used (set to 0). 
             
             
                 
                 
             
           
        
       
     
   
   During self-configuration, each device will build up a matrix showing which devices that can send which control status messages. 
   The method of configuring or setting up a lock system thus comprises the steps 110-140 shown in the flow chart of FIG.  6 . 
   The heart in the lock system is the door control command. The Door Control command is a complex command-set, sent to all actuators that handle door access in the door environment. This function controls the entire door state. All devices have to comply with a predefined set of instructions and rules. The door control command structure is given in table 4 below. 
   
     
       
             
           
             
             
             
             
             
           
             
             
             
             
             
           
         
             
               TABLE 4 
             
             
                 
             
             
               Door Control Commands 
             
             
                 
             
           
           
             
                 
             
           
        
         
             
                 
               Identifier 
               Data 1 
               Data 2 
               Data 3 
             
             
                 
                 
             
             
                 
               Message ID 
               Index 
               Door Control 
               Attributes 
             
             
                 
                 
               02 
               8 bits 
               8 bits 
             
             
                 
                 
             
           
        
         
             
                 
                 
               Bit 
                 
                 
             
             
               Door Control 
               Size 
               no. 
               Value 
               Comment 
             
             
                 
             
             
               Security Lock 
               1 
               0 
               0 = Locked 
               Security Lock will 
             
             
                 
               bit 
                 
               1 = Unlocked 
               wait for door closed 
             
             
                 
                 
                 
                 
               and locking device 
             
             
                 
                 
                 
                 
               “locked” status. 
             
             
               Locking 
               1 
               1 
               0 = Lock 
               If a security lock is 
             
             
               Device 
               bit 
                 
               1 = Unlock 
               present the locking 
             
             
                 
                 
                 
                 
               device will wait for 
             
             
                 
                 
                 
                 
               the unlocked status. 
             
             
               Door Operator 
               1 
               2 
               0 = Closed 
               Door operator will 
             
             
                 
               bit 
                 
               1 = Open 
               open the door when 
             
             
                 
                 
                 
                 
               all locking devices 
             
             
                 
                 
                 
                 
               are in unlocked 
             
             
                 
                 
                 
                 
               state. 
             
             
               Hold/Release 
               1 
               3 
               0 = Release 
               This command is only 
             
             
                 
               bit 
                 
               1 = Hold 
               for door holding 
             
             
                 
                 
                 
                 
               devices. 
             
             
               Inactive 
               1 
               4 
               0 = Active 
               Act only on active 
             
             
                 
               bit 
                 
               1 = Inactive 
               commands. 
             
             
               — 
               3 
               5-7 
               0 
               Not Used 
             
             
                 
               bits 
             
             
               — 
               6 
               0-5 
               0 
               Not Used 
             
             
                 
               bits 
             
             
               Tamper/ 
               1 
               6 
               0 = 0K 
               Activator is 
             
             
               Sabotage 
               bit 
                 
               1 = Tamper/Sab. 
               tampered, or 
             
             
                 
                 
                 
                 
               sabotaged. 
             
             
               Error 
               1 
               7 
               0  =  Device OK. 
               Internal error. 
             
             
                 
               bit 
                 
               1  =  General 
             
             
                 
                 
                 
               error. 
             
             
                 
             
           
        
       
     
   
   There can be multiple door control commands in a system. Since each actuator will be aware of all activators present on the bus, it can collect the door control messages from all activators, and through a prioritisation process calculate the actual door state. Only active messages will take part in the priority process. 
   Any activator can be inhibited except for panic/emergency exit devices. The inhibited activator will still send data on the bus, but it will indicate (inside message) that the device is inhibited. By default all activators are in active mode (not inhibited). In any system there must be only one device that control the inhibit state of the system&#39;s activators. 
   An exemplary configuration and operation of the lock device system shown in  FIG. 1  will now be given. 
   After power-on, each device will send a claiming message in which information is passed to all other devices regarding Node id, Device Attributes, and Message Connection Matrix. 
   Since all connections are logical only, each device has to tell all other devices what messages it will send. It is up to each device to decide which messages are received and which are discarded. 
   During automatic configuration there are a total of 32 messages that can be sent from a device, represented as binary data in the claiming message, where the logical value “0” means “don&#39;t connect message” and logical “1” means “connect message”. 
   There is no particular order considered between devices, when making connections. Each device has an internal factory-programmed unique serial number. This number is used to decide who is sending a claiming message at any given time. 
   Assume that the devices shown in  FIG. 1  will claim in the following order, thereby being assigned a corresponding node ID: 
   
     
       
             
             
           
         
             
                 
             
             
               Node ID 
               Device 
             
             
                 
             
           
           
             
               1 
               Exit button 30 
             
             
               2 
               Locking device 10 
             
             
               3 
               Door operator 40 
             
             
               4 
               Card reader 20 
             
             
                 
             
           
        
       
     
   
   After power-on, this results in a sequence of events that will be described in detail in the following. 
   The exit button  30  sends its claiming message wherein it claims node id 1. The following connection matrix is also sent: 
   Command: 0004  hex , Status: 0004  hex . 
   The command matrix corresponds to the following binary sequence: 
   0000 0000 0000 0100 
   Referring to table 2 and table 3 for details of the command and status matrix, respectively, this indicates, when read from right to left, i.e., from bit  0  to bit  15 , that the exit button can send command no.  3 , Door Control Command. This command can be received by all other devices in the system. 
   The status information has the same content, i.e., the exit button can send status message no.  3 , Debug Status. However, this status information is only used by a computer unit connected to the system during trouble shooting, for example, and will be discarded by all devices normally connected to the system. 
   The claiming message sent by the exit button will thus result in the following configuration of the system: 
   
     
       
             
             
           
             
             
             
             
             
             
           
         
             
                 
             
             
               Messages 
               . . . are received by these devices 
             
           
        
         
             
               sent by 
                 
                 
                 
                 
                 
             
             
               these 
               Node 
                 
               Card 
               Exit 
               operator 
             
             
               devices . . .  
               ID 
               Lock 10 
               reader 20 
               button 30 
               40 
             
             
                 
             
             
               Lock 10 
                 
                 
                 
                 
                 
             
             
               Card 
             
             
               reader 20 
             
             
               Exit 
               1 
               Door 
               Door 
                 
               Door 
             
             
               button 30 
                 
               Control 
               Control 
                 
               Control 
             
             
                 
                 
               Command 
               Command 
                 
               Command 
             
             
               Door oper- 
             
             
               ator 40 
             
             
                 
             
           
        
       
     
   
   The Lock device  10  now claims node id  2  and sends the following connection matrix: 
   Command: 0001  hex . Status: 0005  hex    
   This connection matrix corresponds to the following messages: 
   Command message: Door Control Command 
   Status messages: Locking Device Status, Debug Status 
   The Door Control Command and the Locking Device Status messages can be received by all other devices. However, as already mentioned, the Debug status message is discarded by all devices. 
   This results in the following configuration: 
   
     
       
             
             
           
             
             
             
             
             
             
           
         
             
                 
             
             
               Messages 
               . . . are received by these devices 
             
           
        
         
             
               sent by 
                 
                 
                 
                 
                 
             
             
               sent by 
                 
                 
                 
                 
               Door 
             
             
               these 
               Node 
                 
               Card 
               Exit 
               operator 
             
             
               devices . . .  
               ID 
               Lock 10 
               reader 20 
               button 30 
               40 
             
             
                 
             
             
               Lock 10 
               2 
                 
               Door 
               Door 
               Door 
             
             
                 
                 
                 
               Control 
               Control 
               Control 
             
             
                 
                 
                 
               Com- 
               Com 
               Com- 
             
             
                 
                 
                 
               mand, 
               mand, 
               mand, 
             
             
                 
                 
                 
               Locking 
               Locking 
               Locking 
             
             
                 
                 
                 
               Device 
               Device 
               Device 
             
             
                 
                 
                 
               Status 
               Status 
               Status 
             
             
               Card 
             
             
               reader 20 
             
             
               Exit 
               1 
               Door 
               Door 
                 
               Door 
             
             
               button 30 
                 
               Control 
               Control 
                 
               Control 
             
             
                 
                 
               Command 
               Command 
                 
               Command 
             
             
               Door oper- 
             
             
               ator 40 
             
             
                 
             
           
        
       
     
   
   Door operator  40  now claims node ID  3  and sends the following connection matrix: 
   Command: 0005  hex,  Status: 0014  hex    
   This device will send Emergency Command and Door Control Command as well as Debug Status and Door Operator Status. However, Debug status is discarded by all devices and the Lock  10  will discard the Emergency Command. 
   Finally, Card Reader  20  claims node ID  4  and sends the following connection matrix: 
   Command: 001F  hex , Status: 0064  hex    
   This device will send Emergency Control Command, Door Control Command, Inhibit Command and Identification Device Control Command as well as the status messages Debug Status, Identification Device tag data, and Identification Device event. However, the other devices will discard the Emergency Control Command, Identification Device Control Command as well as all the status messages. Also, the Lock  10  will discard the Inhibit Command. 
   This results in the following configuration: 
   
     
       
             
             
           
             
             
             
             
             
             
           
         
             
                 
             
             
               Messages 
               . . . are received by these devices 
             
           
        
         
             
               sent by 
                 
                 
                 
                 
                 
             
             
               sent by 
                 
                 
                 
                 
               Door 
             
             
               these 
               Node 
                 
               Card 
               Exit 
               operator 
             
             
               devices . . .  
               ID 
               Lock 10 
               reader 20 
               button 30 
               40 
             
             
                 
             
             
               Lock 10 
               2 
                 
               Door 
               Door 
               Door 
             
             
                 
                 
                 
               Control 
               Control 
               Control 
             
             
                 
                 
                 
               Com- 
               Com- 
               Com- 
             
             
                 
                 
                 
               mand, 
               mand, 
               mand, 
             
             
                 
                 
                 
               Locking 
               Locking 
               Locking 
             
             
                 
                 
                 
               Device 
               Device 
               Device 
             
             
                 
                 
                 
               Status 
               Status 
               Status 
             
             
               Card 
               4 
               Door 
                 
               Door 
               Door 
             
             
               reader 20 
                 
               Control 
                 
               Control 
               Control 
             
             
                 
                 
               Command 
                 
               Com- 
               Com- 
             
             
                 
                 
                 
                 
               mand, 
               mand, 
             
             
                 
                 
                 
                 
               Inhibit 
               Inhibit 
             
             
                 
                 
                 
                 
               Command 
               Command 
             
             
               Exit 
               1 
               Door 
               Door 
                 
               Door 
             
             
               button 30 
                 
               Control 
               Control 
                 
               Control 
             
             
                 
                 
               Command 
               Command 
                 
               Command 
             
             
               Door 
               3 
               Door 
               Emer- 
               Emer- 
             
             
               operator 
                 
               Control 
               gency 
               gency 
             
             
               40 
                 
               Com- 
               Com- 
               Com- 
             
             
                 
                 
               mand, 
               mand, 
               mand, 
             
             
                 
                 
               Door 
               Door 
               Door 
             
             
                 
                 
               Operator 
               Control 
               Control 
             
             
                 
                 
               Status 
               Com- 
               Com- 
             
             
                 
                 
                 
               mand, 
               mand, 
             
             
                 
                 
                 
               Door 
               Door 
             
             
                 
                 
                 
               Operator 
               Operator 
             
             
                 
                 
                 
               Status 
               Status 
             
             
                 
             
           
        
       
     
   
   Now all connections are established. 
   As can be understood from the example above: 
   Each device will send out a message containing a “bit pattern” which define which messages that will be transmitted from the claiming device. 
   Each device will decide whether to establish connections of up to 32 messages from other devices or not, depending on device type and functionality. 
   In  FIG. 7  there is shown a double door system comprising, besides the devices shown in  FIG. 1 , a second door operator  40 ′ and a first and a second door operator safety sensor  50 ,  50 ′. In such a system with two devices having the same function, i.e., being of the same product type, a group switch is used to identify a group to which a device belongs. Devices within the same group can interact while devices in different groups will not interact. By means of the group switch, a fairly complex lock system can be installed by means of the inventive self-configuration process. 
   In the system shown in  FIG. 7 , the first door operator  40  and the first safety sensor  50  belong to a first group of devices while the second devices  40 ′ and  50 ′ of the same kind belong to a second group of devices. All other devices belong both to the first and the second groups. The group belonging is communicated by means of the attributes information in the claiming message, see table 1, wherein it can be seen that there are three possible selections: Group  1 , Group  2 , or Group  1 +Group  2 . Thus the functional devices interconnections will look as in FIG.  8 . It is seen there that Sensor  1 , i.e. the first safety sensor  50 , can send messages to Actuator  2 , i.e., the first door opener  40 , but not to Actuator  3 , i.e., the second door opener  40 ′. The reverse is true for Sensor  2 , i.e., the second safety sensor  50 ′. This will prevent a configuration wherein the first sensor sends messages to the second opener or the second sensor sends messages to the first opener etc. 
   Preferred embodiments of a lock system according to the invention and a method of configuring the same have been described. A person skilled in the art realises that this could be varied within the scope of the appended claims. 
   Embodiments comprising one or two doors have been described. It will be appreciated that, for more advanced solutions, an intelligent door controller or a special configuration tool can be used to set up the system. 
   Although externally powered devices have been described, there can also be provided an internal battery either as primary or secondary power supply. 
   The door openers and the door opener safety sensors in  FIG. 7  have been described as two different devices. However, they can be physically integrated into one single device with a single connection to the interconnecting bus  90 . Even in that case, they still act as two different logical units on the bus and one of the devices functions as a sub-devices, as indicated by the attributes shown in table 3. This feature allows for an even easier installation of the lock system while maintaining the flexibility and functionality of the self-configuration.