JP4535966B2 - Fuel supply system - Google Patents

Description

  The present invention relates to a fuel supply system, and in particular, is configured to perform data communication between a setter that sets fuel supply conditions and a fuel supply machine that supplies fuel under the set conditions to acquire fuel supply information. A fuel supply system.

  For example, in a liquid supply station that supplies fuel such as gasoline or light oil, there are a plurality of measuring machines (fuel supply machines), a setting device for setting supply conditions for each measuring device, a plurality of measuring devices and a plurality of setting devices. A fuel supply system having a POS device that performs data communication with each of these is provided (see, for example, Patent Document 1).

The POS device is connected to a plurality of weighing machines and a plurality of setting devices via a communication line (LAN: Local Area Network), and requests supply information indicating the state of each setting device at a predetermined time interval. The supply information at that time is received, and the status of the entire service station is managed in real time. On the other hand, the setter communicates data with the control unit of each weighing machine via a POS device, and displays the current status of the weighing machine (for example, during supply or when liquid supply is finished, nozzle switch on / off, etc.). The information shown is requested at predetermined time intervals, and the information returned from the weighing machine via the POS device is acquired.
JP 2000-168900 A

  In the fuel supply system using the above communication method, since the POS device receives information from a plurality of setting devices and a plurality of weighing machines, the load on the POS device is heavy, and the setting device is interposed by the POS device intervening. Took time to get information on the weighing machine.

  As a method for solving such a problem, it is considered that the setting device and the weighing machine are communicably connected so that the setting device directly receives the information of the weighing device.

  Polling / selecting (POL / SEL) method for communication between each device at the service station, where the upper control station (master station) is connected to multiple lower stations (slave stations) The communication protocol is used. In addition, in the weighing machine, it is possible to supply liquid separately with the liquid supply nozzle on the front surface side and the liquid supply nozzle on the rear surface side, and 2 on the front side and the rear surface side so as to perform setting in each liquid supply area, respectively. A setter is installed. On the other hand, one control unit provided inside the weighing machine controls each liquid supply system on the front side and the rear side.

  However, in the polling / selecting (POL / SEL) method, when an information request signal is transmitted from the control station (master station) to the terminal station (slave station), information is transmitted from the terminal station (slave station) to the control station (master station). Therefore, the two setting devices (master station) cannot communicate with one weighing machine control unit (slave station) at the same time.

  As a method for solving such a problem, for example, a method of communicating between the setting devices by connecting the setting devices with different wirings can be considered, but the wiring becomes complicated.

  Accordingly, an object of the present invention is to provide a fuel supply system that solves the above problems.

  In order to solve the above problems, the present invention has the following means.

The invention according to claim 1 is a fuel supply machine that supplies fuel to a supply target;
Prior to the supply of fuel from the fuel supply machine to the supply object, a supply information setting unit having input means for setting and inputting information related to the supply of the fuel as supply information;
A control unit configured to control supply based on information set and input by the supply information setting unit provided in the fuel supply unit;
A POS device that is connected to the supply information setting unit via a communication line and manages the supply information setting unit and the fuel supply unit;
A fuel supply system comprising:
The supply information setter with respectively provided on the front and rear surfaces of the fuel supply device, it is connected to the control unit of the one, the respective supply information setter as main station, and, the one of the control unit The communication is controlled by the polling / selecting method using the slave as a slave station, and each of the supply information setters communicates when no other supply information setter is communicating with the one control unit . Control means is provided.

The invention according to claim 2 is characterized in that the communication control means comprises:
Communication status monitoring means for monitoring whether or not communication between the one control unit and the other supply information setting device is performed;
A communication start means for starting communication with the one control unit when it is detected that communication is not performed by the communication status monitoring means;
It is characterized by having.

According to a third aspect of the present invention, each of the supply information setting devices is
When the elapsed time measured by the time measuring means for measuring the passage of time reaches a predetermined time-out time, or when the communication status monitoring means detects that communication is not being performed, Configured to start communication with the control unit,
The time-out period of each supply information setting device is set differently for each supply information setting device .

The invention according to claim 4 is characterized in that the supply information setting unit is
Comprising information storage means for storing supply information input by the input means and operation information of the fuel supply machine as transmission information;
Transmission that is mutually connected with the POS device as a master station and the supply information setter as a slave station and that is contrary to the transmission information newly input by the input means among the transmission information stored in the information storage means If the information contains, and having a transmission information deleting means deletes stored from the information storage means contradictory transmission information of the transmission information stored in said information storage means.

The invention according to claim 5 is characterized in that the transmission information deleting means is
When the transmission information newly input by the input means matches the oldest transmission information stored in the information storage means, the oldest transmission information stored in the information storage means The transmission information is erased from the information storage means .

According to the present invention, along with front and supply information setter on the rear surface are provided in the fuel supply apparatus, a communication control means for performing communication when the other supply information setter is not communicating to one of the control unit because provided to supply information setter a plurality of plurality of supply information setter can be prevented from simultaneously communicating to the control unit, corresponding to a plurality of supply information setter controlling section as a slave becomes the main station It is possible to transmit information on each supply system to each supply information setting unit when controlling the supply system.

In addition, according to the present invention, it is monitored whether or not communication between one control unit and another supply information setting device is performed, and it is detected that communication with another supply information setting device is not performed. In this case, since communication is started with respect to one control unit , a plurality of supply information setting units are prevented from communicating with the control unit at the same time.

Further, according to the present invention, when one supply information setting device has a predetermined time-out time (set to a different time depending on each supply information setting device) measured by the time measuring means Or a plurality of supply information setters for starting communication with one control unit when it is detected by the communication status monitoring means that communication between the other supply information setters and the control unit is not performed. Can prevent simultaneous communication with the control unit .

Further, according to the present invention, the transmission information newly input by the input means among the transmission information stored in the information storage means is connected to each other with the POS device as the master station and the supply information setter as the slave station. Transmission information corresponding to the cancellation information that is contrary to the newly input transmission information among the transmission information stored in the information storage means is stored by the information storage means. Since it is deleted, the amount of information stored in the information storage means can be reduced, and the storage capacity of the information storage means can be reduced accordingly.

Further, according to the present invention, when the transmission information newly input by the input means matches the oldest transmission information among the transmission information stored in the information storage means, the information is stored in the information storage means. Since the oldest transmission information of the transmission information is deleted from the information storage means , the burden on the POS device can be reduced.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a fuel supply system according to the present invention. As shown in FIG. 1, the fuel supply system 10 includes a plurality of fuel supply devices 16 (16 _{1 to} 16 _n ) installed in the liquid supply area 12, a POS device 20 installed in the office 18, And a storage device 22 connected to the POS device 20.

The fuel supply device 16 includes a self-service liquid supply type meter (fuel supply device) 24 and a setting device (supply information setting device) 26 mounted on the meter 24. The plurality of fuel supply devices 16 (16 _{1 to} 16 _n ) are connected to the POS device 20 via a communication line (for example, SS-LAN) 30.

Setter 26 is provided on the front and rear surfaces of the fuel supply device 16 ₍₁₆ 1 ~16 _n), in the interior of the fuel supply device 16 ₍₁₆ 1 ~16 _n), each of the liquid supply system of the front and rear surfaces A control unit (which is hidden and cannot be seen in FIG. 1) is stored. Moreover, the said control part is connected with the two setting devices 26 so that communication is possible.

  Furthermore, as will be described later, a plurality of setting devices 26 are provided for one weighing machine 24, and the plurality of setting devices 26 are used as higher-level master stations, and the one weighing machine 24 is used as a slave station. Communication control is performed by a selecting method, and each of the plurality of setting devices 26 is provided with communication control means 25 for performing communication when the other setting devices 26 are not communicating with one weighing machine 24. ing.

  The communication control means 25 is communicated by a communication status monitoring means 25a that monitors whether communication is performed between one weighing machine 24 and another setting device 26, and a communication status monitoring means 25a. Communication start means 25b for starting communication with one weighing machine 24 when it is detected that there is no data. That is, the setting device 26 starts the self-communication communication after the communication of the self-origination or the other transmission is completed within the protocol of the transmitted / received message. The setter 26 resumes from its own transmission with a specified time-out, such as when a communication error occurs or when a device recovers from a device failure. However, the setting device 26 resumes by changing the time-out time according to an address number that is a device-specific value. Sometimes restart from a setter with a short timeout. This prevents the two setting devices 26 from communicating with the control unit at the same time.

  FIG. 2 is a front view of the fuel supply device 16. As shown in FIG. 2, the fuel supply device 16 includes an operation unit 38 having the weighing machine 24 and the setting device 26, struts 40 standing on both sides of the operation unit 38, and a hose support unit horizontally mounted on the upper part. 44. In addition to the above-described control unit, the metering machine 24 is provided with each device such as an electromagnetic valve of each liquid supply system, a liquid supply pump, and a flow meter.

  The setter 26 is provided with a plurality of push buttons for performing operations such as oil type selection, oil supply amount selection, payment method selection, etc., and according to a voice guide from the speaker 49, oil type selection, oil supply amount selection, Each input operation such as payment method selection can be performed. Further, a human detection sensor 50 is provided above the setting device 26. When the human detection sensor 50 is turned on, it is determined that the customer is in front of the setting device 26, and voice guidance is started. The

  The front panel 58 of the weighing machine 24 is provided with nozzle hooks 62 for hooking the liquid supply nozzle 60 at three locations. A liquid supply hose 64 suspended from the hose support 44 is connected to the liquid supply nozzle 60 in communication. The setting device 26, the liquid supply nozzle 60, and the nozzle hook 62 are also provided on the rear surface of the weighing machine 24.

FIG. 3 is a system diagram showing a communication system among the POS device 20, the setting device 26, and the weighing machine control unit. As shown in FIG. 3, the setting devices 26 _{1 to} 26 _n include first communication ports 27 _{1 to} 27 _{n to} which one end of the communication line 30 is connected and a second communication terminal to which one end of the communication line 32 is connected. Communication ports 28 _{1 to} 28 _n . Accordingly, the communication port 20a of the POS device 20 is connected to the _first communication ports 27 _{1 to} 27 _n of the setting devices 26 _{1 to} 26 _n via the communication line 30, and the second ports of the setting devices 26 _{1 to} 26 _n . The communication ports 28 _{1 to} 28 _n are connected to the communication ports 35 _{1 to} 35 _{n of} the weighing machine controllers 34 _{1 to} 34 _n via the communication line 32.

In the weighing machine 24 ₁ , two setting devices 26 ₁ , 26 ₂ are connected to _one control unit 34 ₁ via the communication line 32. Similarly, in the weighing machine 24 ₂ , two setting devices are connected. 26 _3, 26 ₄ are connected to the control unit 34 ₂ of the one through the communication line 32.

FIG. 4 is a timing chart for explaining a communication sequence in the fuel supply device 16. In FIG. 4, for convenience of explanation, the setting device ₂₆ 1, 26 ₃ as a setting unit a, shows a setter ₂₆ 2, 26 ₄ as setter b.

  As shown in FIG. 4, data communication is performed between the control unit 34 and the setting devices a and b by a polling / selecting (POL / SEL) method. The setting devices a and b have timers Ta and Tb that count elapsed times, respectively, and when the count values of the timers Ta and Tb reach a predetermined value (upper waiting time (timeout time tao, tbo)). , Timed out and programmed to proceed to the next process. The timeout times of the timers Ta and Tb are set to different times, for example, the timeout time tao is set to 500 msec and the timeout time tbo is set to 510 msec.

  Next, communication exchange (procedure) between the setting devices a and b and the control unit 34 of the weighing machine 24 will be described with reference to FIG.

  (Procedure 1) When the setting devices a and b are activated, one setting device a becomes “waiting for the end of communication with the setting device b” at the count time a1 of the timer Ta, and the other setting device b receives the timer Tb. Becomes “waiting for the end of communication with the setter a” at the count time b1.

  (Procedure 2) Since the timeout time tao of the setting device a is shorter than the timeout time tbo of the timer Tb (tao <tbo), the setting device a times out first. When the setter a does not receive the end of communication of the setter b even after the timeout time tao elapses, the setter a transmits an “inquiry (transmission request signal)” to the control unit 34 of the weighing machine 24. Communication with the control unit 34 is started (at time a1). At this time, since the timeout time tbo has not elapsed, the other setting device b remains in a “setting device a communication end waiting” state (time b2).

  (Procedure 3) Upon receiving the “inquiry (transmission request signal)” transmitted from the setting device a, the control unit 34 of the weighing machine 24 transmits the fuel supply information on the supply lane a side to the setting device a, When the data communication on the lane a side ends, “EOT (End of TEXT)” indicating the end is transmitted to the setting device a (at time a3).

  (Procedure 4) As a result, one setter a enters a “waiting for the end of setter b communication” state when “EOT” is received from the control unit 34 (time a3).

  (Procedure 5) When the other setter b reaches the time-out time tbo or when it is detected that “EOT” has been transmitted from the control unit 34, the other setter “b” (Transmission request signal) "is transmitted, and communication with the control unit 34 of the weighing machine 24 is started (at time b3). At this time, one setter a is in a “setter b communication end waiting” state.

  (Procedure 6) Upon receiving an inquiry from the setting device b, the control unit 34 of the weighing machine 24 transmits fuel supply information on the liquid supply lane b side. When the data communication related to the fuel supply information on the liquid supply lane b ends, “EOT (End of TEXT)” indicating the end is transmitted to the setting device b (at time b4).

  (Procedure 7) When one setter a reaches the time-out time tao or when it is detected that EOT is transmitted from the control unit 34 to the setter b, the one setter a sends it to the control unit 34 of the weighing machine 24. An “inquiry (transmission request signal)” is transmitted, and communication with the control unit 34 of the weighing machine 24 is started (at time a4). At this time, the other setter b is in a “setter a communication end waiting” state.

  Since the communication lines 30 and 32 are SS-LAN specifications, an EOT indicating termination may be transmitted from the setting device 26 side depending on the communication contents.

  As described above, in this embodiment, the setting devices a and b are set immediately after the setting devices a and b are activated by making the timeout times tbo and tbo different between the setting devices a and b. Can communicate with the control unit 34 of the weighing machine 24 alternately with a predetermined time difference so as not to make inquiries at the same time, and even if there are a plurality of upper master stations, it is possible to communicate with lower slave stations without any trouble. In addition, each of the setting devices a and b performs communication with the control unit 34 after confirming that the communication between the setting device on the partner side and the control unit 34 has been completed. However, it can communicate with subordinate slave stations without any trouble.

  FIG. 5 is a block diagram for explaining the setting device 26 of the second embodiment. As shown in FIG. 5, the setting device 26 according to the second embodiment includes an input means 70 such as a touch panel for setting and operating the fuel type and supply amount, and a nozzle switch (not shown) provided on the nozzle hook 62. And an information storage means 72 for storing the supply information input by the input means 70 and the operation information of the weighing machine 24 as transmission information.

  The setting device 26 of the second embodiment is connected to the POS device 20 so as to be communicable with the other setting devices 26 as in the case of the first embodiment, and inquires of the control unit 34 according to the procedure shown in FIG. Is transmitted and the communication for receiving the fuel supply information from the control unit 34 is performed, and when the other setting device 26 is communicating with the control unit 34, the communication waiting state is maintained. When communication between the control unit 34 and the control unit 34 is completed, an inquiry is transmitted to the control unit 34.

  Further, when the POS device 20 is used as a control station and the setting device 26 is connected to each other as a slave station, and the transmission request is received from the POS device 20, the setting device 26 transmits transmission information excluding information that does not require transmission. Transmission information selection means 74 for transmitting to the POS device 20 is connected.

  Further, the transmission information selection means 74 is connected when the cancellation information for canceling the transmission of the predetermined transmission information is input from the transmission information stored in the information storage means 72 by the input means 70 or by the communication line 32. When cancellation information for canceling predetermined operation information is input from the weighing machine 24, the transmission information corresponding to the cancellation information among the transmission information stored in the information storage unit 72 is the information storage unit 72. The transmission information deleting means 76 for deleting the memory is provided.

  Further, the setting device 26 determines whether or not cancellation information for canceling transmission of predetermined transmission information is stored in the information stored in the information storage means 72, and the cancellation information is stored. Includes transmission information transmission means 78 for transmitting transmission information excluding transmission information corresponding to the cancellation information to the POS device 20.

  FIG. 6 is a timing chart for explaining the communication sequence of the second embodiment. As shown in FIG. 6, when no operation is performed before the time t <b> 1 elapses, when the time t <b> 1 elapses, the POS device 20 sends an “inquiry (1)” to the setting device a. Is transmitted, the setting device a does not perform any input operation, and the setting device a returns “no operation (no information to be transmitted)” to the POS device 20.

  When the regular gasoline is input to the setter a during the time t1 to the time t2, the setter a indicates that the regular gasoline is set as the liquid type to be supplied from now on. Is stored in the information storage means 72. Then, when “inquiry (2)” is transmitted from the POS device 20 to the setting device a when the time t2 has elapsed, the setting device a changes the “regular setting” stored in the information storage means 72 to the POS device. Reply to 20.

  When the liquid supply nozzle 60 for regular gasoline is removed from the nozzle hook 62 between time t2 and time t3, the setting device a indicates that the liquid supply nozzle 60 has been removed from the nozzle hook 62. "Removal" is stored in the information storage means 72. Then, when “inquiry (3)” is transmitted from the POS device 20 to the setting device a when the time t3 elapses, the setting device a deletes the “regular nozzle removal” stored in the information storage means 72. Reply to 20.

  When the canceling operation is performed after the regular setting operation by the input unit 70 between the time t3 and the time t4, and then the high-octet setting operation is performed, the setting device a stores “regular setting” in the information storage unit 72. ”Is stored,“ regular setting ”is deleted based on the“ cancel ”information, and then“ high-octet setting ”is stored. Then, when “inquiry (4)” is transmitted from the POS device 20 to the setting device a when the time t4 has elapsed, the setting device a changes the “high-octet setting” stored in the information storage means 72 to the POS device. Reply to 20.

  If the liquid supply nozzle 60 for regular gasoline is removed from the nozzle hook 62 during the period from time t4 to time t5 and then the liquid supply nozzle 60 is returned to the nozzle hook 62 again, the setting device a is provided with the information storage means 72. After the “regular nozzle removal” is stored, the “regular nozzle removal” memory is erased based on the information of “regular nozzle application”. Then, when “inquiry (5)” is transmitted from the POS device 20 to the setting device a when the time t5 has elapsed, the setting device a stores nothing in the information storage means 72, so the POS device 20 Reply “No operation” to.

  When the supply nozzle 60 for high-octane gasoline is removed from the nozzle hook 62 between time t5 and time t6, the setting device a stores “high-octane nozzle removal” in the information storage means 72. Then, when “inquiry (6)” is transmitted from the POS device 20 to the setting device a when the time t6 has elapsed, the setting device a deletes the “high-oct nozzle removal” stored in the information storage means 72. Reply to 20.

  Here, the control process executed by the setting device 26 of the second embodiment will be described. FIG. 7 is a flowchart for explaining the control process 1 of the setting device 26 according to the input operation.

  As shown in FIG. 7, when there is an input operation (input of type, supply amount, etc.) by the input means 70 in S11, the process proceeds to S12, and processing corresponding to the input operation (for example, blinking of a button, voice guidance, Display input information).

  In the next S13, the storage contents stored in the information storage means 72 are confirmed. Then, it progresses to S14 and it is checked whether the same operation as this input operation is memorize | stored. In S14, when the same operation as the current input operation is stored, the process proceeds to S15, and the storage of the same operation stored last time is deleted from the information storage means 72.

  In the next S16, it is checked whether or not an operation (for example, “cancel”) opposite to the current input operation (for example, “regular setting”) is stored. If it is determined in S16 that an operation that conflicts with the current input operation is stored, the process proceeds to S17, and the storage of the conflicting operation is deleted from the information storage unit 72.

  If it is determined in S16 that an operation contrary to the current input operation is not stored, the process proceeds to S18, and the current input operation is stored in the information storage unit 72.

  As described above, the setting device 26 does not store the same operation twice or more, and when the operation that conflicts with the current input operation is stored, the memory of the conflicting operation is deleted. Since the amount of information stored in the information storage unit 72 can be reduced without storing any information, the storage capacity of the information storage unit 72 can be reduced. In addition, the amount of information transmitted to the POS device 20 can be reduced.

  FIG. 8 is a flowchart for explaining the interrupt processing 1 when an inquiry is made from the POS device 20. As shown in FIG. 8, the setting device 26 checks whether or not there is an inquiry from the POS device 20 in S21. If there is an inquiry from the POS device 20 in S21, the process proceeds to S22, and it is checked whether or not the information of the operation content input by the input means 70 is stored in the information storage means 72.

  If the operation content information is stored in the information storage unit 72 in S22, the process proceeds to S23, and the stored content of the oldest information among the operation content information stored in the information storage unit 72 is transferred to the POS device 20. Send. Accordingly, when a plurality of pieces of information are stored, the oldest information is transmitted to the POS device 20, and when only one piece of information is stored, the information is transmitted to the POS device 20. Subsequently, the process proceeds to S <b> 24, and the transmitted storage content is deleted from the information storage unit 72.

  If the operation content information is not stored in the information storage unit 72 in S22, the process proceeds to S25, and “no operation” is transmitted to the POS device 20.

  As described above, the POS device 20 does not receive all the information stored in the information storage means 72 but receives the information from the setting device 26 in order from the oldest information to be transmitted to the POS device 20. Therefore, it is not necessary to receive unnecessary information, and even when the operator performs a plurality of operations in succession, the information on the same operation is not transmitted more than once from the setting device 26, and Information on conflicting operations is not transmitted. Therefore, the information transmitted from the setting device 26 to the POS device 20 is reduced, and the information processing speed of the POS device 20 is improved.

  Here, the control process executed by the setting device 26 of the third embodiment will be described. FIG. 9 is a flowchart for explaining the control process 2 of the setting device 26 according to the input operation.

  As shown in FIG. 9, when there is an input operation (input of type, supply amount, etc.) by the input means 70 in S31, the process proceeds to S32 and processing corresponding to the input operation (for example, blinking of a button, voice guidance, input) Display information).

  Subsequently, in the next step S <b> 33, the operation content is stored in the information storage unit 72. Therefore, in the third embodiment, all the operation contents operated by the setting device 26 are stored in the information storage unit 72.

  FIG. 10 is a flowchart for explaining the interrupt process 2 when an inquiry is made from the POS device 20. As shown in FIG. 8, the setting device 26 checks whether or not there is an inquiry from the POS device 20 in S41. If there is an inquiry from the POS device 20 in S41, the process proceeds to S42 and the information stored in the information storage means 72 is confirmed.

  In next step S43, it is checked whether or not the information storage means 72 stores the same operation as the oldest operation information. If the same operation as the oldest operation information is stored in S43, the process proceeds to S44, and the oldest operation information is deleted from the information stored in the information storage means 72. Then, the process returns to S42.

  In S43, if the same operation as the oldest operation information is not stored, the process proceeds to S45, and whether or not the operation information opposite to the oldest operation information is stored in the information storage means 72 is determined. To check. In S45, if operation information (for example, “regular nozzle removal”) that is the opposite of the oldest operation information (for example, “regular nozzle removal”) is stored, the process proceeds to S46, and the information storage means 72 stores the information. The operation information (for example, “regular nozzle application”) that is in conflict with the oldest operation information (for example, “regular nozzle removal”) is deleted. Then, the process returns to S42.

  In S45, if the same operation as the oldest operation information is not stored, the process proceeds to S47, and it is checked whether or not the operation content is stored in the information storage means 72. In S47, when the operation content is stored in the information storage means 72, the process proceeds to S48, and the oldest information is transmitted to the POS device 20. In S47, if there is no operation content stored in the information storage means 72, the process proceeds to S49, where “no operation” is transmitted to the POS device 20.

  In this way, the POS device 20 does not receive all the information stored in the information storage means 72, but can receive only the oldest information from the setting device 26. Therefore, the POS device 20 and the setting device 26 Even if the operator does not need to exchange unnecessary information, and the operator performs a plurality of operations in succession, the information on the same operation is not transmitted more than twice from the setting device 26 and there is a conflict. No operation information is sent. Therefore, the information transmitted from the setting device 26 to the POS device 20 is reduced, and the information processing speed of the POS device 20 is improved.

  In the above-described embodiment, the self-service liquid supply system has been described. However, the present invention is not limited to this, and the present invention is not limited to this. Of course, it can be applied.

  In the above embodiment, the case where gasoline is supplied to the automobile has been described. Needless to say, the present invention can also be applied to a fuel supply system that supplies other fuels (hydrogen gas, LPG, CNG, etc.). .

  Moreover, in the said Example, although the fuel supply apparatus 16 with which the setting device 26 and the measuring machine 24 were integrated was mentioned as an example, it is not restricted to this, The structure which provides the setting device 26 and the measuring device 24 separately. Of course, it is good.

It is a block diagram which shows one Example of the fuel supply system which becomes this invention. 2 is a front view of a fuel supply device 16. FIG. It is a systematic diagram which shows the communication system of POS apparatus 20, the setting device 26, and a weighing machine control part. 3 is a timing chart for explaining a communication sequence in the fuel supply device 16; It is a block diagram for demonstrating the setting device 26 of Example 2. FIG. 6 is a timing chart for explaining a communication sequence according to the second embodiment. It is a flowchart for demonstrating the control process 1 of the setting device 26 according to input operation. 5 is a flowchart for explaining interrupt processing 1 when an inquiry is made from a POS device 20; It is a flowchart for demonstrating the control process 2 of the setting device 26 according to input operation. It is a flowchart for demonstrating the interruption process 2 when there exists an inquiry from POS apparatus 20. FIG.

Explanation of symbols

10 fuel supply system 12 supply fluid area _{16 (16} 1 _~16 n) fuel supply system 20 POS device 24 the weighing machine 25 the communication control unit 25a communication situation monitoring unit 25b communication start means _{26 (26} 1 _~26 n) setter 27 ₁ -27 _n 1st communication port 28 ₁ -28 _n 2nd communication port 30,32 Communication line 60 Liquid supply nozzle 62 Nozzle hook 34 ₁ -34 _n Weighing machine controller 35 ₁ -35 _n Communication port 70 Input means 72 Information storage means 74 Transmission information selection means 76 Transmission information deletion means 78 Transmission information transmission means

Claims (5)

A fuel supply machine for supplying fuel to the supply target;
Prior to the supply of fuel from the fuel supply machine to the supply object, a supply information setting unit having input means for setting and inputting information related to the supply of the fuel as supply information;
A control unit configured to control supply based on information set and input by the supply information setting unit provided in the fuel supply unit;
A POS device that is connected to the supply information setting unit via a communication line and manages the supply information setting unit and the fuel supply unit;
A fuel supply system comprising:
The supply information setter with respectively provided on the front surface and the rear face of the fuel supply device, it is connected to the control unit of the one, the respective supply information setter as main station, and, the one of the control unit The communication is controlled by the polling / selecting method with the slave as a slave station, and each of the supply information setters communicates when no other supply information setter is communicating with the one control unit . A fuel supply system provided with a control means. The communication control means includes
Communication status monitoring means for monitoring whether or not communication between the one control unit and the other supply information setting device is performed;
A communication start means for starting communication with the one control unit when it is detected that communication is not performed by the communication status monitoring means;
The fuel supply system according to claim 1, comprising: Each of the supply information setters indicates that the elapsed time measured by the time measuring means that measures the passage of time has reached a predetermined timeout time, or that communication is not being performed by the communication status monitoring means. When detected, it is configured to start communication with the one control unit,
3. The fuel supply system according to claim 2 , wherein the time-out period of each supply information setter is set differently for each supply information setter . The supply information setting device includes:
Comprising information storage means for storing supply information input by the input means and operation information of the fuel supply machine as transmission information;
Transmission that is mutually connected with the POS device as a master station and the supply information setter as a slave station and that is contrary to the transmission information newly input by the input means among the transmission information stored in the information storage means 2. A transmission information deleting unit that deletes, from the information storage unit, conflicting transmission information among transmission information stored in the information storage unit when information is included. The fuel supply system in any one of thru | or 3. The transmission information deleting means includes
When the transmission information newly input by the input means matches the oldest transmission information stored in the information storage means, the oldest transmission information stored in the information storage means 5. The fuel supply system according to claim 4 , wherein the transmission information is erased from the information storage means .

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