Fuel dispenser

Abstract: A fuel dispenser comprises a distributed dispenser control including a plurality of microcontroller nodes and a communications bus connecting the microcontroller nodes each of which is associated with a respective component or group of components. This reduces the amount of information that requires to be processed by a single processing unit enabling additional features to be more easily incorporated in a basic dispenser design, or to be retrofitted to dispensers employing the present invention.

Description: The present invention relates to improvements in fuel dispenser electronics design. The term "fuel dispenser" is sometimes used in this art to distinguish a housing which receives fuel from a fuel pump located in a storage tank, from a housing which contains a fuel pump, such a housing itself being sometimes referred to as a "fuel pump". For the purposes of this specification the term "fuel dispenser" is used in its broader sense to cover both a "fuel dispenser" and "fuel pump", the invention being applicable to both. Modern fuel dispensers use microelectronics to assist in carrying out the dispenser's functions of pumping and dispensing fuel, recording the amount sold, and providing, in some cases, convenient credit or debit card payment options. Often, these latter features have been add-ons to pre-existing dispenser designs, with the result that the dispenser interior may have extensive wiring and cabling for power and control signals, which promotes the possibility of errors occurring. Usually, a single microprocessor has primary dispenser control, as seen in dispenser 10 in Figure 1. Cabling and wiring emanates from a central microprocessor 26. US-A-5 225 995 shows a refuel control system which additionally uses a sub-CPU for eliminating differences in refuelling operations due to pressure variations inside the refuel pipe. Many modern dispensers can be approached from two sides, each by a customer fuelling his or her vehicle, so dispensers include side A and side B capabilities to service these customers, as illustrated in Figure 1. The wiring and cable emanating from the microprocessor 26 includes hardware I/O cable 13 leading to side A main display 12 and its associated price posting units 14. The hardware I/O line 13 also leads to side B main display 16 and its price posting units 18. Power to the microprocessor 26 is obtained through an AC input 20 fed through a power supply 22 and a main regulator 24 to provide a regulated DC supply along line 28. Some dispensers have a programmable pump preset, which turns the pump off after a certain amount of fuel has been dispensed. In dispensers of this type, a preset 30, often a Z80 microprocessor, has a serial interface 32 to the microprocessor 26. Also as seen in Figure 1, the microprocessor 26 has a two-wire connection 46 to additional devices in some embodiments. Thus, as shown in Figure 1, card reader in dispenser (CRIND) logic modules 44, 50 are provided connected to card reader peripherals 48, 52 respectively. The peripherals may include a card reader for reading the magnetic stripe on a credit or debit card, a printer to print receipts, a display associated with the card reading and printing process, and a note or currency acceptor for receiving currency. Typically, the card reader logic module 44 will have communications capability over a line, such as a twisted pair 54 to a service station site controller. This is necessary in order to validate credit cards, and the like. Similarly, card reader and personal identification number input devices may be employed. The incorporation of so many features into a modern fuel dispenser, or pump, results in a very complex wiring system which is undesirable in a fuel dispenser environment, and the present electronics architecture may limit the number of features that can be incorporated in a dispenser or retrofitted to an existing dispenser. The present invention provides a fuel dispenser as claimed in claim 1. The invention provides numerous benefits. There are reductions in material costs in that the distributed architecture lends itself to distributed power regulation. This therefore requires fewer cables and connectors for the electronics assembly, the communications bus preferably providing electrical power to the nodes for use by their associated components. There are reduced manufacturing costs as there are fewer cables to connect, resulting in faster assembly with fewer misconnections. The invention eliminates the configuration jump jacks which have previously been used on display boards. The nodes can also be programmed to have the ability to selftest each other for defects. A major advantage provided by the present invention is that the software used is of a decreased complexity since it is distributed into functional modules instead of being concentrated in a central high level processor. This results in a virtually "one-program" dispenser. Employing the present invention enables the dispenser electronics to be of modular design whereby high specification dispensers can be manufactured by adding appropriate models to the basic dispenser enabling the dispenser to be tailored to a customer's specific requirements, but avoiding the need to incorporate unutilised components in the base dispenser models. Furthermore it enables additional features to be retrofitted to the dispenser if a customer's requirements change or if a dispenser needs to be updated. The plurality of processors in the local operating network design can provide service technicians with increased resident diagnostic functions, therefore making it easier to service units in the field and shortening repair times. The invention also provides increased packaging flexibility of the components in a dispenser. Nodes can be placed onto or next to the devices which they control. The modular design, in addition to enabling the dispenser to be tailored to different customer requirements, also enables the dispenser to comply with different standards in different countries. Preferably the dispenser comprises a fuel flow meter, a switch actuable to indicate fuel is to be pumped through the housing, and a display on the housing to display the amount of fuel dispensed, wherein one of the nodes is associated with the display and responds to fuel amount data on the bus to display the amount of fuel pumped. The meter can provide to the bus all the information required by the display and therefore the display can extract this from the bus, the node associated with the display preferably including a calculator system to determine the price for the quantity of fuel dispensed, enabling this node to generate all the information necessary for the display from the basic data relating to the quantity of fuel delivered on the data bus. Advantageously a further node is associated with the switch on the dispenser and with the fuel flow meter and pump for pumping fuel through the housing. This node in effect then achieves mechanical control of the dispenser. The pump for pumping fuel through the housing may be in the dispenser or alternatively in an underground storage tank. Advantageously a control node is associated with data traffic management and diagnostic functions, whereby a user may indicate fuel is to be pumped by actuating a switch generating a signal to one of the nodes, the node communicating data onto the communications bus resulting in the amount of fuel being pumped being presented on a display of the dispenser, with the control node providing data traffic management and diagnostic functions for other nodes and the communications bus. Preferably the dispenser also comprises a data link node associated with a data link to a control console for the dispenser, usually located in the kiosk of the service station, the data link node generating a signal to communicate fuel amount data from the dispenser to the control console. The dispenser may also comprise a card reader for reading payment cards and a node associated with the card reader for communicating card data onto the communications bus, and preferably data link node communicates card data to the console and receives card authorisation data from the console. This enables the data link node to communicate directly with the card reader node, eliminating the quantity of data that needs to be processed by any other microprocessor within the dispenser. The dispenser may comprise any number of nodes associated with other functional components of the dispenser, such as: (a) a printer in the housing to print data derived from the bus; (b) a bank note acceptor for accepting notes and communicating note data with the bus; (c) a video display in the housing for displaying indicia pertinent to data on the bus; (d) an active vapour recovery system; (e) an auxiliary preset; (f) a temperature sensor. A temperature sensor may be required to ensure a uniform calorific value of fuel is dispensed, regardless of the temperature and therefore density of the fuel delivered, or if an active vapour recovery system is employed to ensure the correct quantity of vapour is recovered, which quantity may be dependent on ambient temperature. A number of nodes may each be associated with a respective pump to pump an associated grade of fuel through the housing. Also, where a dispenser has two side with separate components on either side, such as card readers, switches associated with nozzles, etc, then the dispenser may comprise separate sets of nodes associated with each side. The invention will now be described by way of example only, with reference to the accompanying drawings, of which: Figure 1 is a block diagram of a prior art fuel dispenser using a "hub-and-spoke" control configuration; Figure 2 is a block diagram of an embodiment of the fuel dispenser of the present invention showing various ones of the options that can be added as desired; Figure 3 is a block diagram of the electronic components of a typical node used in the invention; Figure 4 is a functional block diagram of the components of a display node; Figure 5 is a functional block diagram of the components of a pulser/hydraulic node; Figure 6 is a functional block diagram of the components of a two-wire-keypad node; Figure 7 is a functional block diagram of the components of a card reader node; Figure 8 is a more detailed functional block diagram of certain of the components of a card reader node; Figures 9 to 11 are diagrams showing the operation of the card reader and its node as they interface the communications bus; Figure 12 is a diagram showing the types of statements that the various nodes will put on the communications bus and their intended recipients. In contrast to the central, controlling microprocessor used in the dispenser depicted in Figure 1, the present invention provides distributed processing with multiple microprocessor nodes. A preferred embodiment uses serial protocol and hardware and software made available by Echelon Corporation, 4015 Miranda Ave., Palo Alto, California 94304. The various components available from Echelon Corporation usable in connection with the invention and in establishment of the preferred embodiment are a neuron 3120 chip, a neuron 3150 chip, a LonBus communications bus and a LonTalk protocol for networking the chips together. A detailed discussion of the Echelon system is outside the scope of this specification. However information about the Echelon system is publicly available from various patent specifications in the name of Echelon Corporation and from publications available from Echelon. These should enable those of ordinary skill in the art to make and use a network system, following the description set forth herein for achieving desired functionalities. As seen in Figure 2, the communications bus 102 has various nodes connected to it by the node connections described by Echelon in its product literature. Thus, a side A display node 120 is connected, having its associated price posting unit displays 14, the same as the price posting units of Figure 1. Similarly, the side B display node 122 has PPU displays 18. The bus 102 also has connected an A side card reader in dispenser (CRIND) display 190 and a B side CRIND display node 192, an A side CRIND node 194 and a B side CRIND node 196, an A side note acceptor node 198 and a B side note acceptor node 200, and an A side printer node 202 and a B side printer node 204. The CRIND display node 190 may, if desired, be a video display or a single- or multiline display. The communications bus 102 is a five-wire bus having two data wires, a reset wire and two power supply wires for the nodes. Other possibilities such as a two-wire bus that achieves power and communications objectives can be used. The power supply wires provide electrical power to the nodes for use by their associated functional components. Each microcontroller node includes a network communication port, a read-only memory storing a communications protocol, a memory-storing application code suitable for that node, and input/output pins and counter/timers. The communication bus 102 also has connected to it three separate pulser/hydraulic nodes 140, 142, 144. The number of these nodes can vary depending on the number of grades of fuel the dispenser is to be capable of dispensing. A vapour recovery node 206 and an auxiliary preset node 208 can also be provided. The dispenser 100 also has either a two-wire keypad node 170 or a card reader control node 180, but both are not required. Both are shown in Figure 2 for the sake of making it clear that either can be provided. The fact that only one of the two is needed is indicated by surrounding each by a dotted line. If the two-wire keypad node 170 is used, it receives the signals from the manager keypad 36 and any optional keypads 172, along with any keypads 182, 184 specifically provided for operating the card reader. These are supplied, for example, to permit a customer to select options of prices, other purchase choices, or the like. The functionality achieved in the dispenser of Figure 2 can be achieved in various configurations of nodes. There would normally be employed at least one pulser hydraulic node such as node 140, at least one display 120 and one or the other of card reader control node 180 or two-wire keypad node 170. The printer node 202 may, as is conventional, be used to print receipts for customers, and the like. Additional functionalities can be very easily added by retrofitting the dispenser to add the functioning component (e.g., a note acceptor) and adding associated microchip nodes to the communications bus 102. In addition, there may be some software changes to the pre-existing nodes to accommodate the added note acceptor. These can be communicated from the console controller over twisted pair 54 or the manager keypad 36 or a Maintenance/Diagnostic node temporarily installed for this purpose. Turning now to Figure 3, details of the electronic components of a typical node are shown. The communications bus 102 has connected to it the neuron chip 106. In some case, it is desirable to have a ROM/RAM memory 108 available to supply additional data or program for the chip 106. A clock 110 is provided to provide clock pulses to the chip 106. The chip 106 also has an input/output interface 112 to the functioning components of dispenser associated with that node. In some cases, there is also an external CPU 116 connected by an optional microprocessor interface program, such as the MIP program sold by Echelon (hereafter "MIP") 114 to the neuron chip 106. The MIP software provides a high level user interface between the neuron 106 and the microprocessor 116. The microprocessor 116 may be a Z80, 68000, etc. The MIP's purpose is to allow the exchange of control information between the neurons and the external processor. The chip 106 is preferably an Echelon neuron chip, which comes in two versions - Model 3120 and 3150. Figure 4 is a more detailed functional block diagram of the components associated with the display node 120. The display node 120 includes the neuron chip 124 having a data link to a main display 126, which in turn is linked to the PPU displays 14. One display node per side is required according to a preferred embodiment. The neuron chip 124 can be incorporated on a main display board for the dispenser and is shown so consolidated in Figure 2. The chip 124 drives the PPU board 14 and also performs transaction calculations to display the amount sold and the associated price on the display 126. Each PPU could be a separate node in another embodiment. Figure 5 shows the components of the pulser hydraulic node 140. These include neuron chip 146 associated with its peripheral functioning units. For a typical two-sided dispenser, there will be two pump handles 148, two quadrature pulsers 150, two pulser fail circuitry signal units 152, two main valves 154, two slow-down valves 156, and an STP motor 158 associated with each grade of fuel, assuming installation in a multi-product dispenser. Thus, one node is provided per each two pulsers. The chip 146 receives signals from the pump handle 148 and output signals on communications bus 102 to indicate that the pump handle has been lifted. That signal is used by other nodes in the dispenser, as picked up from the communications bus 102 to indicate that the dispenser is turned on. The neuron chip 146 also turns on the STP motor 158 for the grade of fuel associated with the handle that has been lifted. Typically, the STP motor pressurizes the conduit, but liquid does not flow until a valve in the dispensing nozzle is open. That causes liquid to flow, which causes the generation of output pulses from the associated quadrature pulser 150 to the neuron chip 146. This series of pulses is converted to a volume of liquid dispensed using a preset conversion factor in the neuron chip 146. Alternatively, the pulser data could be transmitted to the communications bus 102 for conversion elsewhere, such as at the display node. Pulser fail circuitry 152, known to those of ordinary skill in the art, monitors operation of the quadrature pulser and will provide an error signal to the neuron chip 146, should an error be detected. The neuron chip 146 also controls the main valve 154, causing that valve to open when the pump handle 148 is lifted. In some cases, a slowdown valve 156 is employed in the dispenser. Slowdown valves 156 are known, in particular, for dispensers that pump a preset value of fuel, with the valve restricting the flow of liquid toward the end of that transaction to assure that the amount dispensed does not overshoot the dispensed fuel amount appropriate for the preset value. As noted, the preferred embodiment discloses the pulser hydraulic chip 146 as controlling various functioning dispenser components. If desired, the local operating network could be configured to have separate nodes for each of those components. Figure 6 shows the structure of the two-wire/keypad node 170. As noted above, the two-wire keypad node 170 is used in lieu of the card reader node 180 when card reader capability is not required. The two-wire keypad 170 is connected to the communications bus 102 and includes a neuron processor 106 similar to the chip 3150 described above. The neuron processor receives data from the manager keypad 36 and the optional keypad 172, which might be added to the system. The neuron processor 106 also is connected to a serial controller 116 such as a UART which, in turn, communicates over two-wire communication line 112 to a site controller. Only one of the two-wire keypad nodes 170 is required for each dispenser, since it is capable of performing needed roles for each side of the dispenser. The two-wire keypad node acts as a pump state enforcer, scans and interprets the manager keypad 36 and handles pump/console communications. As the pump state enforcer, it ensures that the proper control sequences for the pump dispenser have occurred to allow pump operation. That is, the pump state is a term used to indicate the condition that the pump is in, such as idle, pumping, etc. These states are arrived at by a certain control sequence, and the two-wire keypad node assures that the proper control sequence has occurred to allow pump operation. In scanning and interpreting the manager keypad, the two-wire keypad node electronically reads any data being supplied to the system over the keypad 36. This data might take the form of input data or, more commonly, perhaps assuming control of the operation of the dispenser or updating program options. The two-wire keypad 170 also provides through its serial controller a UART functionality for external serial communications. UART is an acronym for Universal Asynchronous Receiver Transmitter, which is a silicon chip that handles the transmission and reception of serial data. If desired, the dispenser can be made in a stand-alone version, in which case the two-wire keypad 170 would not need to have the two-wire communication line 112 to the site controller. Turning now to Figure 7, the structure of a CRIND control node 180 is described. The CRIND control node controls the card reader options and uses the Echelon neuron 3150 microprocessor 106. It also has associated an application server processor 116, which is a higher level microprocessor, such as those of the class of 68xxx, 80x86, or Z180. The application server processor also has a twisted pair connection 54 to the site controller. The processor 106 is connected to keypads 182, 184 servicing dispenser side A and dispenser side B respectively. From the keypads, customers may indicate selections to the dispenser, such as what type of credit card to pay with, whether cash or debit transaction is required, or any other selection, such as, for example, selections for car wash purchases. The neuron processor 106 receives data from the manager keypad 36 and any other additional optional keypads 172, which may be provided. The processor 106 receives and provides data onto the bus 102 and receives and provides data to the application server processor 116 according to software embedded in each. As an example of the way the Echelon hardware and software are interfaced with a fuel dispenser, more details of the operation of the CRIND control node 180 are seen, in connection with the following description of Figures 8 to 12. The application processor 116 has three areas 220, 222, 224, speaking figuratively, for operation of the CRIND control node 180. Area 220 provides application control for side A of the dispenser. Area 222 of the application processor 116 provides application processor control for side B of the dispenser. Area 224 provides BIOS for the two areas 220, 222 as well as connection to the twisted pair 54 and connection to the neuron chip 106. Chip 106 provides message interpretation and transmission to and from the application processor 116 from the communications bus 102. A typical sequence of operations and communications is shown by the arrows and encircled numbers in Figure 8. Thus, a first step might be a service request by area 220 for side A communicated to the BIOS area 224. The BIOS area 224 responds with an acknowledgement 2. Further, the BIOS 224 outputs a network variable output request 3 to the chip 106 which, in turn, provides a network variable input event 4. This is followed by a side B application service request 5 and a side B application BIOS event 6. Thus, the BIOS area 224 serves as a "traffic cop" for the sides A and B applications 220,224 communicating with the communications bus 102 through the neuron chip 106 and also with the site controller over the twisted pair 54. Referring now to Figures 9 to 11, a more concrete example of how these components work together will be described with reference to an A side reader node 194 including a card reader 195 connected to a neuron processor 106. A customer inputs a card 197 into the card reader 195 at step A. At step B, the neuron processor senses card insertion and updates its "A side card inserted" network variable. The network variable update automatically causes the network variable message to be placed on the communications bus 102. The updated network variable is transmitted over the communications bus 102 and noticed by the neuron processor 106 of the CRIND control node 180 (see Figure 10). Thus, the "A side card inserted" network variable update is received by the neuron processor 106 of the CRIND control node 180. That neuron processor 106 returns an acknowledgement message to the card reader node 194 over bus 102 and sends card reader event information into the BIOS 224. As seen in Figure 11, the BIOS area 224 converts the event information into proper format and flags the side A application processor 220, which can provide its own output according to the programming set forth in the side A application processor. The various types of communications which can take place between the various nodes is set forth in the dataflow diagram attached as Figure 12. The messages available along the numbered lines of the dataflow diagram are as follows: Number From To Signal Name 1a Control Printer Printer Data • Transaction Data • Diagnostics Data 2 Printer Control Paper Status • Paper Low • Out of Paper • Paper Okay Printer Status • Idle/Busy • Jammed - Top Sensor - Loop Back - Busy Stuck Door Status • Open • Closed 3 Control CRIND Display Display Data • Prompts • Error Codes • Advertisements • Special Messages 4 CRIND Display Control Display Status • Idle • Memory Full 5 Card Reader Control Card Reader Data • Track 1 Data • Track 2 Data • Security Track Data Card Status • Card In • Card Out • Valid/Invalid 6 Control Card Reader (Motorized) Control • Reject • Eject • Eat • Hold • Release Data • Write to Track 1 • Write to Track 2 • Write to Smart Card 7 Cash Acceptor Control Status • LRC In/Out A • LRC In/Out B • Bill In • Escrow • Stacked • Rejected Bill • Cheat Status • Idle 8 Control Cash Acceptor Control • Stack • Reject • Configure 9 Control Transaction Display • PPU Data • Preset Data • Volume Allocation • Cash Allocation • Manager Keypad Data • Error Messages 10 Pulser/Hydraulic Transaction Display • Volume Dispensed Data 11 Transaction Display Control • Transaction Data Uncompensated • Transaction Data Compensated • Display Error Checking 12 Transaction Display Pulser Hydraulic • Preset Volume Goal • Grade Information (Blender, SHMPD) 13 Control Pulser Hydraulic Conversion Factor • US Gallons • US Gallons to Imperial Gallons • 1012 Pulses Per Gallon Grade Assignment 14 Pulser/Hydraulic Transaction Display Status • Pump Handles • Pulsers • Valves • STP/Motor • Preset Goal 15 All Nodes All Nodes • Deauthorisation 16 Control All Nodes • Authorisation 20 ATC Pulser/Hydraulic VVac • Temperature Data • Volume Correction Factor (VCF) 21 Control ATC Configuration • Fuel Types • Fuel Density 22 ATC Pulser/Hydraulic Transaction Display ATC Data • Temp • Diagnostics • Compensated Volume • Uncompensated Volume • Fuel Type • Fuel Density • VCF 23 Control All • Diagnostics Command • Power Fail 24 All Control • Diagnostics Status 25 Option Control Option Switch Data • Pump Preset • Cash/Credit • Grade Select • CRIND Keypad It will be realised that the invention as defined by the following claims is equally applicable to many types of fuel dispenser or fuel pump arrangements. For example, although the dispenser architecture shown in Figure 2 shows several pulser/hydraulic nodes, the number of pulser/hydraulic nodes can be quite variable, as desired. That is, multiple grades can be easily added by simply adding additional nodes to the communications bus 102 and its associated hardware. Thus, for a three-grade multi-product dispenser, six nodes are used, three pulsers/hydraulic nodes, two display nodes, and one two-wire keypad node (or CRIND control node).

Claims: A fuel dispenser comprising a housing having a plurality of fuel dispensing components therein, characterised in having a distributed dispenser control including a plurality of microcontroller nodes (120,122, 190, 192) and a communications bus (102) connecting the microcontroller nodes, each of the nodes being associated with respective fuel dispensing components (126; 148, 150, 152), whereby at least one component is arranged to receive an input from a user indicating that the user wishes to dispense fuel, whereby the associated node places on the communications bus a message associated to said input, which message is transmitted over the communications bus and noticed by at least one other appropriate node, where the noticed message is processed so as to produce a predetermined result, and wherein each node is arranged to communicate with at least one other node messages relating to the operation of the dispenser. A dispenser as claimed in claim 1 comprising a fuel flow meter, a switch (148) actuable to indicate fuel is to be pumped through the housing, and a display (126) on the housing to display the amount of fuel dispensed, wherein one of the nodes (124) is associated with the display and responds to fuel amount data on the bus to display the amount of fuel pumped. A dispenser as claimed in claim 2 wherein a further node (146) is associated with the switch. A dispenser as claimed in claim 3 wherein the further node is also associated with the fuel flow meter (150) and a pump (158) for pumping fuel through the housing. A dispenser as claimed in any preceding claim comprising a control node (170) associated with data traffic management and diagnostic, whereby a user may indicate fuel is to be pumped by actuating a switch (148) generating a signal to one of the nodes, the node communicating data onto the communications bus resulting in the amount of fuel being pumped being presented on a display of the dispenser, with the control node providing data traffic management and diagnostic functions for other nodes and the communications bus. A dispenser as claimed in any preceding claim comprising a data link node (106) associated with a data link to a control console for the dispenser for generating a signal to communicate fuel amount data from the dispenser to the control console. A dispenser as claimed in any preceding claim further comprising a card reader (195) for reading payment cards (197) and a node (180) associated with the card reader for communicating card data onto the communications bus (102). A dispenser as claimed in claim 7, when dependent on claim 6, wherein the data link node (106) communicates card data to the console and receives card authorisation data from the console. A dispenser as claimed in any preceding claim comprising one or more additional nodes each respectively associated with either: (a) a printer in the housing to print data derived from the bus; (b) a bank note acceptor for accepting notes and communicating note data with the bus; (c) a video display in the housing for displaying indicia pertinent to data on the bus; (d) an active vapour recovery system; (e) an auxiliary preset; (f) a temperature sensor. A dispenser as claimed in any preceding claim wherein the communications bus (102) provides electrical power to the nodes for use by their associated components. A dispenser as claimed in any preceding claim wherein a node (124) associated with a display on the housing includes a calculator to determine the price for the quantity of fuel dispensed. A dispenser as claimed in any preceding claim comprising a plurality of nodes each associated with a respective pump to pump an associated grade of fuel through the housing. A fuel dispenser as claimed in any preceding claim for installation in a service station equipped with a dispenser control console, the dispenser comprising a housing, a fuel flow meter in said housing, a switch actuable to indicate fuel is to be pumped through said housing, a display on said housing to display the amount of fuel pumped through said housing, and a dispenser control including a plurality of microcontroller nodes and a communications bus connecting said microcontroller nodes, a first node associated with said switch, a pump to pump fuel through said housing and fuel flow meter, a second node associated with said display, and a third node associated with a data link to the dispenser control console, whereby a user may indicate fuel is to be pumped by actuating said switch and generating a signal to said first node, with said first node activating said pump and communicating fuel amount data onto said communications bus, said second node responding to fuel amount data on said bus to display the amount of fuel pumped, and said third node generating a signal to communicate the fuel amount data to the dispenser control console. A fuel dispenser as claimed in any one of claims 1 to 12 comprising a fuel flow meter in said housing, a switch actuable to indicate fuel is to be pumped through said housing, a display on said housing to display the amount of fuel pumped through said housing, and a dispenser control including a plurality of microcontroller nodes and a communications bus connecting said microcontroller nodes, a first node associated with said switch, a pump to pump fuel through said housing and fuel flow meter, a second node associated with said display, and a third node associated with program control node, whereby a user may indicate fuel is to be pumped by actuating said switch and generating a signal to said first node, with said first node activating said pump and communicating fuel amount data onto said communications bus, said second node responding to fuel amount data on said bus to display the amount of fuel pumped, and said third node providing data traffic management and diagnostic functions. A dispenser as claimed in any one of claims 1 to 12, further comprising a fuel flow meter in said housing, a switch actuable to indicate fuel is to be pumped through said housing, a display on said housing to display the amount of fuel pumped through said housing, wherein one of said nodes is associated with said switch, a pump to pump fuel through said housing, fuel flow meter, display, and a control node is associated with data traffic management and diagnostic functions, whereby a user may indicate fuel is to be pumped by actuating said switch, thereby generating a signal to one of said nodes and communicating data onto said communications bus, resulting in the display of the amount of fuel pumped, with said control node providing data traffic management and diagnostic functions for the other nodes and the communications bus.

Inventors: ATCHLEY HANS B, RONCHETTI JOHN J SNR, ATCHLEY, HANS B., RONCHETTI, JOHN J. SNR.
Applicants: MARCONI COMMERCE SYS INC, MARCONI COMMERCE SYSTEMS INC.
Application year: 1996
Main classification: G06F19
IPC codes: B67D7