JP2001245061A - Data communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a data communication system which enables devices different by communication systems to communicate data with each other without hindrance. SOLUTION: A repeating terminal device is provided with an ID storage means where an ID code to be recognized by a main controller is stored, a first transmission/reception means which transmits and receives data to and from the main controller through a signal line, a second transmission/reception means which transmits and receives data to and from a device-side controller, a data storage means, and a terminal-side control means which controls data transmission/reception between the data storage means and both transmission/ reception means, and the terminal-side control means writes data, which is received from the device-side controller in a general communication system through the second transmission/reception means, in the data storage and transmits data in the data storage means to the main controller in response to a data request transmitted from the main controller through the first transmission/reception means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the detection and setting of, for example, temperature and the like when a plurality of refrigerators, low-temperature showcases, cooling stores such as prefabricated refrigerators, or equipment such as air conditioners are installed. The present invention relates to a data communication system for transmitting data and the like.

[0002]

2. Description of the Related Art Conventionally, in stores such as supermarkets and convenience stores, a plurality of cooling storage units such as commercial refrigerators and low-temperature showcases are installed, and each cooling storage unit includes a compressor and a condenser constituting a cooling device. , A built-in cooler, or a separate compressor and condenser, the refrigerant discharged from this compressor is condensed by the condenser, decompressed by the decompression device, and then supplied to the cooler to provide the cooling effect And cool air cooled by the cooler is circulated in the refrigerator by a cooling fan to cool to a predetermined low temperature. A condenser fan is installed around the compressor and the condenser, and the condenser and the compressor are air-cooled by the condenser fan.

[0003]

In the case where a plurality of cooling storages are centrally controlled as described above, it is conceivable to attach a terminal device having a communication function to each cooling storage. When the communication method between the terminal device and the control device on the device side is different, there is a problem that the system construction becomes extremely troublesome.

[0004] The present invention has been made to solve the above-mentioned conventional technical problem, and provides a data communication system capable of exchanging data without any trouble even with devices of different communication systems. is there.

[0005]

SUMMARY OF THE INVENTION A data communication system according to the present invention comprises a main controller and a relay terminal connected to a signal line, and a general-purpose communication connected to the relay terminal and different from the main controller. The relay terminal device is constructed from the device-side control device of the system, and exchanges data with the main control device via a signal line and the ID storage means holding its own ID code recognized by the main control device. Transmitting and receiving means for transmitting and receiving data to and from the device-side control device, data storing means capable of writing and reading data, and both Terminal-side control means for controlling the transfer of data to and from the transmission / reception means, and the terminal-side control means stores the data received from the device-side control device via the second transmission / reception means in the data storage means. It can included, and transmits the data in the data storage means to the main controller in response to the data request from the main controller via the first transceiver means.

According to a second aspect of the present invention, there is provided a data communication system,
In the above, the terminal-side control means writes the data received from the main control device via the first transmission / reception means into the data storage means, and responds to the data request from the device-side control device via the second transmission / reception means. Data in the storage means is transmitted to the device-side control device.

According to the present invention, the terminal-side control means of the relay terminal device writes the data received from the device-side control device via the second transmission / reception means to the data storage means, and transmits the data via the first transmission / reception means. The data in the data storage means is transmitted to the main control device in response to the data request from the main control device, so that the general-purpose communication system is different from the communication system between the main control device and the relay terminal device via the signal line. The main control device can collect the data from the device-side control device without any trouble. Also, the terminal-side control means as described in claim 2,
The data received from the main controller via the transmission / reception means is written to the data storage means, and the data in the data storage means is transmitted to the device control apparatus in response to a data request from the equipment control apparatus via the second transmission / reception means. , The data from the main control device can be transmitted to the device-side control devices having different communication systems without any trouble.

Thus, the main control device can exchange data with the device-side control device of the general-purpose communication system different from the communication system using the signal line. In this case, since the relay terminal device has its own ID code in the ID storage means, the main controller can identify the relay terminal device only by connecting the relay terminal device to the signal line, and the relay terminal device can be identified. The wiring of the device is completed. As a result, the wiring can be simplified, and the common software can be used for the main control device regardless of the number of relay terminal devices. Is also possible.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a configuration diagram of a store management system 1 of a supermarket SPM as an embodiment to which the present invention is applied, and FIG. 2 shows a configuration diagram of a store device monitoring system 6 in the store management system 1.

The store management system 1 of the embodiment is a center system 3 comprising a store system 2 installed on the supermarket SPM side, a headquarters C of a chain to which the supermarket SPM belongs, a maintenance management company M for performing maintenance and maintenance, and the like. It is composed of The store system 2 and the center system 3 are connected via a terminal adapter TA... And a public line ISDN.

The headquarters C and the maintenance management company M are responsible for monitoring store equipment, each of which is provided with a personal computer P and each connected to a terminal adapter TA.

On the other hand, the store system 2 includes a store video system 4 for photographing the inside of the store, the back door, and the like, and a store device monitoring system 6 for monitoring the operation of each electrical device such as a showcase and lighting installed in the store, which will be described later. It is composed of The store video system 4 includes a video transmitter 7
And a plurality of fixed cameras 8... Connected thereto and a speaker 9, a microphone 11 and the like. Each fixed camera 8. It is installed on the ceiling in the store.

The fixed camera 8 is capable of shooting a moving image using a CCD image pickup device.
The moving image video data captured by is transmitted to the video transmitter 7. The video transmitter 7 distributes the video data transmitted from the fixed cameras 8 to the personal computers P and P of the headquarters C and the maintenance management company M via the terminal adapter TA and the ISDN line. The distributed video data is displayed on the display of each personal computer P.

Control data is sent from the headquarters C and the personal computer P of the maintenance company M to the video transmitter 7, and the video transmitter 7 controls the directional control and zoom control of each fixed camera 8. Do. As a result, headquarters C and maintenance management company M
Can monitor the occurrence of theft in the supermarket SPM by using the personal computer P, and perform remote security.

On the other hand, in the store of the supermarket SPM, there are a plurality of open showcases S1... And ice cream stockers S2, one or two refrigerated walk-in storages (prefabricated refrigerators) S3, and a closed type reach-in showcase S4. One or two chillers S5 are installed, and an air conditioner 10 and lighting (not shown) are attached to the ceiling.

Of these, the open showcase S1
The refrigerated walk-in storage S3 and the reach-in showcase S4 are connected to a refrigerator (not shown) installed in the machine room of the supermarket SPM or outside by piping, and exhibit cooling ability by receiving a supply of refrigerant from these. In addition, the ice cream stocker S2 and the industrial refrigerator S
Reference numeral 5 denotes an apparatus having a built-in cooling device.

The store monitoring system 6 includes a controller 16 as a main control device,
And a series of signal lines 17 wired in the store,
A button reader 18 (a button-type temperature recording chip is connected to the button reader) connected to the signal line 17 by a coupler, each open showcase S1,..., An ice cream stocker S2, and a refrigerated walk-in storage S
3, the reach-in showcase S4, the industrial refrigerator S5, the relay terminal devices 41... Respectively connected to the device-side control devices 53 (FIG. 4) of the air conditioner 10, and provided in the store room of the supermarket SPM. It is constructed from a monitoring temperature sensor 20 and the like.

Next, the configuration of the controller 16 is shown in FIG.
Shown in Controller 16 is a supermarket SPM
And a memory 32 comprising a CPU (microcomputer) 31, a flash memory, etc., an I / O interface 33, and a 1-wire communication bus I / O as a transmission / reception means. And an I / O interface 34. Further, the controller 16 is provided with a display 37 composed of an LCD or the like, a switch 38 as input means, and the like.

The bus I / O interface 3
4 is connected to the signal line 17 via a port 36A of the controller 16, and the button reader 18 and the relay terminal device 4 are connected via the port 36A and the signal line 17.
1. Transfer data with the temperature sensor 20.

In the memory 32 of the controller 16, a predetermined communication protocol for performing data communication with the button reader 18, the relay terminal device 41, the temperature sensor 20 and the button reader 18, the relay terminal device 41,... In addition, software for identifying the temperature sensor 20 and a control program for performing operation control are set.

The I / O interface 33 of the controller 16 has a communication function using a general-purpose communication system (three-wire bus system), and is connected to a communication line 19 such as an RS-232C cable via a port 36B. The controller 16 is connected to the terminal adapter TA on the store side via the communication line 19, and the bus I / O interface 34 is connected to the image transmitter 7 of the store image system 4 via the same signal line 17. Are also connected.

On the other hand, for example, the open showcase S
FIG. 4 shows a block diagram of one device-side control device 53.
In addition, other ice cream stockers S2, refrigerated walk-in storage S3, reach-in showcase S4, industrial cold storage S
5. The device-side control devices such as the air conditioner 10 may be considered to be substantially the same. That is, a CPU 54 comprising a general-purpose microcomputer and the like of the device-side control device 53 of the open showcase S1 includes a relay for controlling a fan for cooling air and a valve for controlling refrigerant, a thermistor sensor and a key for detecting the temperature in the refrigerator. A control circuit 56 including an input switch and the like is connected. Reference numeral 65 denotes a writable and readable program memory, and the communication method of the CPU 54 is a general-purpose communication method (3-wire bus method).

The CPU 54 of the device-side control device 53 of the open showcase S1 performs control of the valve or the like via a relay based on the internal temperature input from the thermistor sensor of the control circuit 56 in accordance with the control program written in the program memory 65. Control the fan. As a result, control for maintaining the internal temperature at the set temperature set by the key input switch is executed, and products such as food are displayed while being cooled.

The relay terminal device 41 is provided on the board of the device-side control device 53 of the open showcase S1. FIG. 5 is a block diagram of the relay terminal device 41. The relay terminal device 41 is connected to the signal line 17.
1-wire interface logic (first transmission / reception means) 46 of the 1-wire communication system connected to the
(3-wire bus system) interface logic (second transmitting / receiving means) 47 connected to the
A control unit 49 as a terminal-side control unit, a writable and readable memory 51 as a data storage unit, and an ID unit 52 holding an ID code of the relay terminal device 41 itself.
(Memory, ID storage means).

The one-wire interface logic 46 has a serial communication function for transmitting and receiving data to and from the controller 16 via the signal line 17, a register, a protocol, and the like. Therefore, by being connected to the controller 16 via the signal line 17, it has a function of receiving data from the controller 16 and transmitting data to the controller 16. The general-purpose interface logic 47 has a function of transmitting and receiving data to and from the CPU 54 of the device-side control device 53 according to a general general-purpose protocol.

The port switching unit 48 has a function of switching between connecting the one-wire interface logic 46 to the control unit 49 and connecting the general-purpose interface logic 47 to the control unit 49, and is basically connected first. Priority is given to the one connected first, and as soon as communication of the previously connected one is completed, the one connected later is connected. The control unit 49 writes the data transmitted from the controller 16 to the memory 51 and transmits the data in the memory 51 to the controller 16 while the one-wire interface logic 46 is connected by the port switching unit 48. Further, the control unit 49 controls the CPU 5 in a state where the general-purpose interface logic 47 is connected by the port switching unit 48.
4 is transmitted to the memory 51, and the data in the memory 51 is transmitted to the CPU 54.

Here, the relay terminal device 41 basically operates by receiving power supply from the power supply line, but each element other than the general-purpose interface logic 47 operates as described later even if the power supply is cut off. The voltage appearing at 17 is stored and stored in a capacitor in the one-wire interface logic 46, from which it can be powered and operated. When data from the controller 16 is written in the memory 51, a predetermined interrupt output is sent to the CPU 54.

On the other hand, the temperature sensor 20 as a sensor
As shown in detail in FIG. 6, a control unit 61 as a terminal-side control unit, a memory 62 as a storage unit, an I / O interface 63 as a transmission / reception unit and a storage unit,
A sensor unit 64 as a detecting means, and a TH register 66
, A TL register 67, a setting register 68 for determining a state, and a CRC generator 69 for matching the communication.
A power supply detection unit 71 for detecting a Vcc power supply described later;
Capacitor 72 and diode 7 constituting storage means
3, 73 and the like.

In this case, the capacitor 72 is connected to the diode 7
The input terminal 76 is connected to the diode 73 and the I / O interface 63.
Then, the input terminal 76 is connected to the signal line 17, and the capacitor 72 is also connected to the I / O interface 63. The signal line 17 connected to the output port 36A of the controller 16 has a potential (high potential) of +5 V and 0 V, for example.
Data is generated and transmitted by a pulse signal composed of (low potential).

When the temperature sensor 20 is connected to the signal line 17, power is supplied to each element as long as the high-potential and low-potential pulse signals constituting the data are at the high potential, and the capacitor 72 is turned on. Is also charged. While the potential is low, the capacitor 72 discharges power to supply power to each element (parasitic mode).

The temperature sensor 20 has Vcc (DC + 5)
V) A power supply terminal 77 is also provided and connected to the diode 74.
Is connected to a power supply line, each element is configured to be able to operate also by power supply from the power supply line (power supply mode). That is, in this power supply mode, each element operates without filling the capacitor 72, so that the convenience is improved when the temperature sensor 20 is to be quickly operated at the time of inspection or the like.

When the controller 61 is instructed by the I / O interface 63 from the controller 16 as will be described later, the sensor unit 64 detects the room temperature in the store, takes in the temperature data, and temporarily stores the data in the memory 62. Write to. Then, when polling is performed from the controller 16 by the I / O interface 63 as described later,
The temperature data written in the memory 62 is transmitted to the controller 16 through the I / O interface 63.

Here, an ID code of the temperature sensor 20 itself and identification data indicating that the sensor is a sensor are written into the I / O interface 63, an upper limit temperature TH such as a temperature alarm is stored in a TH register 66, and a TL register The lower limit temperature TL is written in 67. The data of the upper limit temperature TH and the lower limit temperature TL is transmitted from the controller 16 to the signal line 17.
Sent via The memory 62 stores a communication protocol and the like for performing data communication with the controller 16. When a failure occurs in the temperature sensor 20, the failure data is also stored in the memory 62.
And transmitted to the controller 16. Also,
The temperature sensor 20 has a self-holding function to hold the current state when communication with the controller 16 is interrupted.

Next, the operation of the above configuration will be described. First, the CPU 31 of the controller 16
The connection status of each element (relay terminal device 41, temperature sensor 20) to the device is scanned. This scanning operation is performed according to the procedure shown in FIG. 7 (the one-wire communication system).
1,... By reading the ID code of the temperature sensor 20. In this description, these are all called terminal devices, and for example, it is assumed that the ID codes of the four terminal devices are 64 bits as shown below.

Bit 012345678... 63 First terminal device 001100000... 0 Second terminal device 1011100000... 0 Third terminal device 110000000. 0 Fourth terminal device 00100000 ... 0

The controller 16 (CPU 31) first transmits a communication command (instruction) to each terminal device, and each terminal device returns an OK command. Next, the controller 16
Sends an ID search command, the terminal device returns to its own
From the D code, the 0th bit is returned as response 1 and its complement is returned as response 2 as follows. Actually, when the 0th bit is 0, the connection terminal of the signal line 17 is at the low potential (hereinafter “L”), and when it is 1, the terminal is at the high potential (hereinafter “H”). And

Bit 0 Response 1 Response 2 First terminal device 0 1 Second terminal device 1 0 Third terminal device 1 0 Fourth terminal device 0 1 Logical product 0 0

The controller 16 makes a determination based on the logical product, and determines that 0 and 1 are present in the 0th bit of each terminal device. Note that the signal line 17 is actually “L” if there is at least one “L” among the connection terminals of the terminal devices connected to the signal line 17, and “H” if all are “H”. Since the controller 16 determines the potential of the signal line 17, the controller 16 detects information on the logical product as a result.

Then, the controller 16 transmits the search commands 0 and 1 of the first bit. At this time, the configuration is such that, when 0 is transmitted, only the terminal device whose 0th bit is 0 returns the first bit, and when 1 is transmitted, only the terminal whose 0th bit is 1 returns the first bit. Have been.

Accordingly, a response to 0 at the time of the search of the first bit is made from the first and fourth terminal devices as follows.

Bit 1 Response 1 Response 2 First terminal device 0 1 Second terminal device Third terminal device Fourth terminal device 0 1 Logical product 0 1

The controller 16 makes a determination based on the logical product, and determines that only 0 exists in the first bit in this case. Therefore, it is determined that there is an ID code of 00.

The response to 1 at the time of searching the first bit is made from the second and third terminal devices as follows.

Bit 1 Response 1 Response 2 First terminal device Second terminal device 0 1 Third terminal device 1 0 Fourth terminal device Logical product 0 0

The controller 16 makes a determination based on the logical product, and determines that 0 and 1 exist in the first bit in this case. Therefore, in this case, it can be seen that the ID codes of 10 and 11 exist.

Next, in response to the determination of the existence of the ID code 00, the controller 16 transmits a search command 0 of the second bit. The response to 0 at the time of the search of the second bit is made from the first and fourth terminal devices as follows.

Bit 2 Response 1 Response 2 First terminal device 10 Second terminal device Third terminal device Fourth terminal device 10 Logical product 10

The controller 16 makes a determination based on the logical product, and determines that only 1 exists in the second bit in this case. Therefore, it is determined that there is an ID code of 001.

Next, in response to the determination of the existence of the ID code 001, the controller 16 transmits a search command 1 of the third bit. A response to 1 at the time of the search of the third bit is made from the first and fourth terminal devices.

Bit 3 Response 1 Response 2 First terminal device 10 Second terminal device Third terminal device Fourth terminal device 0 1 Logical product 0 0

The controller 16 makes a determination based on the logical product, and determines that 0 and 1 are present in the third bit in this case. Therefore, it is determined that there are ID codes of 0011 and 0010.

Next, in response to the determination of the existence of the ID codes 0011 and 0010, the controller 16 transmits a search command 1 of the fourth bit. 1 at the time of search of the 4th bit
Are made from the first and fourth terminal devices.

Bit 4 Response 1 Response 2 First terminal device 10 Second terminal device Third terminal device Fourth terminal device 0 1 Logical product 0 0

The controller 16 makes a determination based on the logical product, and determines that 0 and 1 are present in the fourth bit in this case. Accordingly, it is determined that there are ID codes of 00110 and 0010.

Next, in response to the determination of the existence of the ID code 00110, the controller 16 sends the search command 0 in the fifth bit.
Send A response to 0 at the time of the search of the fifth bit is made only from the first terminal device.

Bit 5 Response 1 Response 2 First terminal device 0 1 Second terminal device Third terminal device Fourth terminal device Logical product 0 1

The controller 16 makes a determination based on the logical product, and determines that only 0 exists in the fifth bit in this case. Therefore, it is determined that there is an ID code of 00100. Thereafter, if only the search command 0 is repeated up to the 63rd bit, 001100... 0, that is, it is determined that the first terminal device of this ID code is connected.

In addition, when the first bit is searched, 1
Since 1 and 0 are present in the first bit in the response to, this time, 0 and 1 are transmitted in the search of the second bit, and narrowing down is similarly performed. Finally, if the bits in which 0s and 1s exist are eliminated, the ID codes of all the terminal devices will be determined.

The CPU 31 of the controller 16 uses the ID code collected in this way to send the
The connection status of the relay terminal device 41 and the temperature sensor 20 on the substrate is identified and stored in the memory 32.
Data transmission / reception is performed with each relay terminal device 41... Temperature sensor 20 using the D code.

Next, the CPU 31 of the controller 16 polls the temperature sensor 20 using the collected ID code (starts temperature measurement). The procedure (communication protocol) at this time will be described with reference to FIG. In this case, it is assumed that the Vcc power supply terminal 77 of the temperature sensor 20 is connected to the power supply line and is in the power supply mode.

The controller 16 sends a communication start command. The controller 16 always keeps the port 36 connected to the signal line 17 at “H”, and transmits this communication start command by setting the port 36 to 480 μs to 960 μs.
(Microseconds) This is executed by setting “L”. Then, the controller 16 waits for 15 μs to 60 μs. During this time, the signal line 17 is at “H”.

Thereafter, an OK command is returned from the temperature sensor 20. The transmission of the OK command is executed by setting the input terminal 76 to “L” for 60 μs to 240 μs. Then, the controller 16 has a temperature sensor 20
To send a broadcast setting command to. Temperature sensor 20
When the broadcast setting command is received via the I / O interface 63, the control unit 61 recognizes that the next command will be issued to the temperature sensor 20.

Next, the controller 16 transmits a temperature measurement start command (instruction to start a detection operation) to the designated temperature sensor 20 (or a plurality of temperature sensors 20). After transmitting the temperature measurement start command, the controller 16 waits for 750 ms (millisecond). Upon receiving the temperature measurement start command via the I / O interface 63, the control unit 61 of the designated temperature sensor 20 measures (detects) the temperature with the sensor unit 64 and stores the measured temperature data in the memory 62. I do.

When the 750 ms standby period has elapsed, the controller 16 reads temperature data next. That is, the controller 16 transmits the communication start command again, and the OK command is returned from the temperature sensor 20.

Next, the controller 16 specifies and transmits the call command for the designated temperature sensor and the ID code of the temperature sensor 20. Then, a memory call command (read instruction) is transmitted. The specified ID
The control unit 61 of the temperature sensor 20 holding the code returns the temperature data stored in the memory 62 to the controller 16 in response to the read command specified by its own ID code.

The CPU 31 of the controller 16 writes the temperature data transmitted from the temperature sensor 20 into the memory 32. Finally, the controller 16 transmits a reset command, and the temperature sensor 20 returns an OK command. Thus, the controller 16 collects temperature data from the temperature sensor 20. When a plurality of temperature sensors are provided, the command after the waiting period is repeated to collect the temperature data.

On the other hand, the CPU 54 of the device-side control device 53 periodically, appropriately spontaneously, or in response to a request from the relay terminal device 41 (general-purpose interface logic 47 or control unit 49), displays the open showcase S1. The data on the temperature in the refrigerator and the data on the alarm such as abnormal temperature are transmitted to the relay terminal device 41. The control unit 49 of the relay terminal device 41 is a general-purpose interface logic 4
7 receives the data, and controls the port switching unit 48 to write the data to the memory 51.

Then, the controller 16 polls the relay terminal device 41 voluntarily or by utilizing the above-mentioned standby state, and makes a data read request. The procedure in this case will be described with reference to FIG. The controller 16 first transmits a communication command, and an OK command is returned from the relay terminal device 41. The controller 16 transmits the call command of the relay terminal device 41 and the ID code of the relay terminal device 41.

Then, the controller 16 transmits a calling command. In response to this polling, the control unit 49 of the relay terminal device 41 returns the data written in the memory 51 by the port switching unit 48 as described above to the controller 16 via the signal line 17 via the one-wire interface logic 46. Then, finally, the controller 16 transmits a reset command, and the relay terminal device 4
1 returns an OK command. Controller 16
CPU 31 writes the fetched data in memory 32.

In this way, the controller 16 can fetch and manage data on the temperature and abnormalities of the open showcase S1 and the like, while fetching the room temperature data from the temperature sensor 20. In particular, the data of the device-side control device 53 is stored in the memory 51 of the relay terminal device 41.
The controller 16 does not need to perform polling at a fixed cycle, and can read out this history when an abnormality occurs.

Next, when data such as temperature setting and a control program (for example, when upgrading the version) is transmitted from the controller 16 to each device-side control device 53 such as the open showcase S1, data from the controller 16 is first transmitted. The signal is sent to the relay terminal device 41 via the signal line 17. The control unit 49 of the relay terminal device 41 receives the data by the one-wire interface logic 46,
The data is written into the memory 51 by controlling the port switching unit 48.

When data from the controller 16 is written to the memory 51, the CPU 54 of the device-side control device 53
As described above, a predetermined interrupt output is sent to the CPU. When the CPU 54 receives the interrupt output, the relay terminal 41 via the general-purpose interface logic 47 in a three-wire bus system.
Request data. Control unit 49 of relay terminal device 41
Converts the data in the memory 51 into a CP in response to the data request.
Transmit to U54. The CPU 54 writes this data into the program memory 65.

As described above, according to the present invention, the control unit 49 of the relay terminal device 41 writes the data received from the CPU 54 of the device-side control device 53 through the general-purpose interface logic 47 into the memory 51, Since the data in the memory 51 is transmitted to the controller 16 in response to a data request from the controller 16 via the logic 46, the communication method between the controller 16 and the relay terminal device 41 via the signal line 17 differs from the general-purpose communication method. The data from the device controller 53 of the communication method is
The controller 16 can collect data without any trouble. Further, the control unit 49 writes the data received from the controller 16 via the one-wire interface logic 46 into the memory 51, and responds to a data request from the device-side control device 53 via the general-purpose interface logic 47 to store the data in the memory 51. Since the data is transmitted to the device-side control device 53, the data from the controller 16 can also be transmitted to the device-side control device 53 using a different communication method without any trouble.

As a result, the controller 16 sets the signal line 1
7, data can be exchanged with the device-side control device 53 of a general-purpose communication system different from the communication system using the communication system 7. In this case, the relay terminal device 41 is
Has its own ID code, so simply connecting the relay terminal device 41 to the signal line 17
Can identify the relay terminal device 41,
Is completed. This makes it possible to simplify the wiring, and common software can be used for the controller 16 regardless of the number of relay terminal devices 41 (the number of open showcases S1). It is also possible to achieve a significant reduction in cost.

In the embodiment, the supermarket SPM
However, the present invention is not limited to this, but is also effective in stores such as convenience stores and restaurants. Further, the interpretation of the store includes a general office building and the like. Furthermore, the present invention is not limited to the number of relay terminal devices connected to the signal line.

[0076]

As described above in detail, according to the present invention, the terminal-side control means of the relay terminal device writes the data received from the device-side control device via the second transmission / reception means into the data storage means, Since the data in the data storage unit is transmitted to the main control unit in response to a data request from the main control unit via the first transmission / reception unit, the communication between the main control unit and the relay terminal device via the signal line is performed. The main control device can collect data from the device-side control device of the general-purpose communication method different from the communication method without any trouble. Further, the terminal-side control means writes the data received from the main control device via the first transmission / reception means into the data storage means,
If the data in the data storage means is transmitted to the device-side control device in response to a data request from the device-side control device via the transmission / reception means, data from the main control device can be transmitted to the device-side device having a different communication method. The transmission can be performed without any trouble to the control device.

As a result, the main control device can exchange data with the device-side control device of the general-purpose communication system different from the communication system using the signal line. In this case, since the relay terminal device has its own ID code in the ID storage means, the main controller can identify the relay terminal device only by connecting the relay terminal device to the signal line, and the relay terminal device can be identified. The wiring of the device is completed. As a result, the wiring can be simplified, and the common software can be used for the main control unit regardless of the number of relay terminal devices. Is also possible.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a supermarket store management system as an embodiment to which the present invention is applied.

FIG. 2 is a configuration diagram of a store equipment monitoring system in the store management system.

FIG. 3 is a block diagram of an electric circuit of the controller.

FIG. 4 is a block diagram of an electric circuit of the device-side control device of the open showcase.

FIG. 5 is a block diagram of an electric circuit of the relay terminal device.

FIG. 6 is a block diagram of an electric circuit of the temperature sensor.

FIG. 7 is a diagram showing a procedure for reading ID codes of the relay terminal device and the temperature sensor by the controller.

FIG. 8 is a diagram showing a procedure for collecting data from a temperature sensor by a controller.

FIG. 9 is a diagram showing a procedure for collecting data from the relay terminal device by the controller.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 store management system 2 store system 3 center system 4 store video system 6 store equipment monitoring system 16 controller 17 signal line 20 temperature sensor 41 relay terminal device 42 control unit 44 relay control device 46 1 wire interface logic 47 general-purpose interface logic 48 Port switching unit 49 Control unit 51 Memory 52 ID unit 54 CPU 56 Control circuit 61 Control unit 63 I / O interface 64 Sensor unit 65 Program memory 72 Capacitor

Claims (2)

[Claims] 1. A main control device and a relay terminal device connected to a signal line, and a device control device connected to the relay terminal device and having a general-purpose communication method different from the main control device, comprising: The relay terminal device includes an ID storage device having its own ID code recognized by the main control device, and a first transmission / reception device for exchanging data with the main control device via the signal line. A second transmission / reception unit for transmitting / receiving data to / from the device-side control device; a data storage unit capable of writing / reading data; and a data transmission / reception unit between the data storage unit and the two transmission / reception units. Terminal-side control means for controlling the transfer of data of the device. The terminal-side control means writes data received from the device-side control device via the second transmission / reception means into the data storage means. Seen, data communication system and transmitting the data in said data storage means in response to the data request from the main control device via the first transceiver means to the main controller. 2. The terminal-side control unit writes data received from the main control unit via the first transmission / reception unit into the data storage unit, and the device-side control unit via the second transmission / reception unit 2. The data communication system according to claim 1, wherein data in the data storage means is transmitted to the device-side control device in response to a data request from the device.