JPH0782586B2 - Two-wire display device - Google Patents

Description

[Detailed Description of the Invention] "Industrial field of application" This invention should be used, for example, at companies, schools, government offices, etc. to display the status of employees leaving and leaving the office, or to display the approval or disapproval of a meeting in which a large number of people participated. And a two-wire display device capable of

[Prior Art] As proposed in "Japanese Patent Publication No. 63-31785", the present applicant controls a display device having a large number of display windows by using a two-wire signal transmission line, and displays the arrival and departure of a company. We have proposed a two-wire display device that is designed to be used.

The previously proposed two-wire type display device includes a main controller in the two-wire type signal transmission line, a plurality of display devices controlled by the main controller, and a plurality of operating devices for switching the display state of the display device. Each display and operation unit counts the reference clock sent from the main controller, and when this count value is assigned to itself and matches the address, data is exchanged with the main controller and the operation unit inputs. The operation command data is sent to the main controller, and the display operates so as to fetch the display data at the timing of its own address.

The concept of this system will be briefly described with reference to FIG. The operation unit 1 and the display unit 2 are provided with rotation changeover switches 3 and 4, and the rotation changeover switches 3 and 4 perform a changeover operation in synchronization with each other.

The operation device 1 is provided with operation switches 5A to 5N, and the operation switches 5A to 5N are assigned to each user.

The display device 2 is provided with a temporary storage device 6, and the temporary storage device 6 stores information indicating the states of the operation switches 5A to 5N sent from the transmitter 1, and the storage output causes the indicator light to be displayed.
Controls 7A to 7N to turn on and off.

The indicator lights 7A to 7N are arranged corresponding to the respective windows WD of the indicators 2A and 2B shown in FIG. 7, and the user names drawn on the windows WD are switched between illuminated and non-illuminated states to indicate whether they are present or not. indicate.

The previously proposed two-wire type display device utilizes the operating principle shown in FIG. 6 to configure the rotation changeover switches 3 and 4 by electronic circuits.

That is, as shown in FIG. 8, the reference clock generator 11, the operating device 12 and the display 13 are connected to the two-wire signal transmission line 106. Address registers 12A and 1 are provided on the operation unit 12 and the display unit 13.
3A is provided, and the reference pulses output from the reference pulse generator 11 are counted by the address registers 12A and 13A, and operations equivalent to those of the rotation changeover switches 3 and 4 are performed.

In the operation unit 12, the operation switches 5A to 5A corresponding to the address determined by the sequence number of each reference pulse in synchronization with the reference pulse.
The ON / OFF state of 5N is read, and the control information indicating the state is sent to the two-wire signal transmission line 10.

The display 13 takes in the control information sent in synchronization with the reference pulse to the display driver 13B, and controls the indicator lights 7A, 7B, ... 7N to be turned on and off.

[Problems to be Solved by the Invention] In the previously proposed two-wire type display device, an address determined by the order of reference pulses is assigned to each operation switch 5A to 5N and the display window.

Therefore, as the number of windows of the display unit and the number of operation switches of the operation unit increase, the cycle of accessing each window and operation switch becomes longer, and as a result, the display assigned to the operation switch after operating the operation switch. There is a drawback that it takes a long time to actually reverse the state of the window.

In other words, there is a time delay in the response until the state of the display window changes with respect to the operation input of the operation switch, and the state of the window does not reverse even if you operate it, so repeat the operation many times in succession. Incorrect operation will be performed.

An object of the first invention of this application is to provide a two-wire type display device capable of reducing a delay time of a display operation with respect to an operation input even if the number of display windows is large.

An object of the second invention of this application is to provide a two-wire type display device capable of preventing an erroneous operation even if the number of display windows increases and a display operation is delayed accordingly.

"Means for Solving the Problem" In the first invention of this application, a plurality of display devices each having a plurality of display windows for displaying information related to a user for each display window, and the plurality of display devices. And a plurality of operating devices equipped with a plurality of input means for switching the display states of the respective display windows are connected to the main controller by a two-wire signal transmission line, and are assigned to the respective display devices and the respective operating devices. A first memory for storing the representative address and model data indicating whether it is a display unit or an operating unit, and an address uniquely assigned to each display window of the plurality of display units and each input means of the operating unit. And a second memory for storing the correspondence between the user number and the user number,
The main controller is provided with a third memory for storing display data indicating the relevant information of the user with the number of the user as an address, and the main controller uses only the model data for each of the operating devices. The means for calling by sending the representative address, the user's number from the operation device and the display data thereof are input, and the second storage device is referred to for corresponding use of the third storage device. Means for rewriting the display data of the user's number, and by sending the representative address of the display device only to the display device by the model data, and also calling the user's number of the third storage device and the display data thereof. And a means for doing so, when the operation device is called by its representative address,
The display device is provided with means for transmitting data indicating the state of the operation input means as display data together with the user's number, and the display stores the relationship between the address given to the display window and the user's number, When it is called by its own representative address, a means for receiving the user number and its display data sent thereafter and displaying the corresponding display data on the display window corresponding to the user number is displayed. The two-wire display device provided is proposed.

In the second aspect of the present application, a plurality of display devices each having a plurality of display windows for displaying information related to a user for each display window and a display state of each display window of the plurality of display devices are switched. A plurality of input means for operation and a plurality of operating devices equipped with display elements corresponding thereto are connected to the main controller by a two-wire transmission line, and the representatives are respectively assigned to the respective displaying devices and the respective operating devices. A first storage device for storing an address; and a second storage device for storing a correspondence between an address uniquely assigned to each display window of the plurality of display devices and each input means of the operation device and a user number. The main controller is provided with a third memory for storing display data indicating the relevant information of the user with the user's number as an address, and the main controller sends the representative address to each of the operating devices. Means for calling and the above operation Means for rewriting the display data of the corresponding user number in the third storage unit by inputting the user number and its display data from the above, and referring to the second storage unit. On the other hand, means for sending and calling the representative address and sending the user number of the third storage device and the display data thereof,
After the display data is sent, a means for transmitting the data designating the representative address and the display data to an operating device having a display window corresponding to the changed display data and a corresponding display element is provided. When the input means is operated, the means for blinking the display element corresponding to the input means and the data indicating the state of the operation input means when called by the representative address of the user are used as display data of the user. The display is provided with a means for transmitting with a number and a means for stopping the blinking of a designated display element called by its own representative address, and the above-mentioned display is related to the address given to its display window and the user's number. When the user's representative address is stored, the user's number and the display data sent thereafter are received, and the display window corresponding to the user's number. And are two-wire display device comprising means for the display corresponding to the display data. Is provided.

According to the first invention of this application, only the input means of the operating device is always sequentially accessed to search for the presence or absence of the input operation. In the two-wire type display device of this type, the ratio of the number of display windows of the display device to the number of input means of the operating device is about 20 to 30% of the total when the total is 100%. That is, the number of display windows is usually larger than the number of input means.

Therefore, normally, the presence or absence of the input can be found in a short time by sequentially accessing only the input means and searching for whether or not the display change is input. According to the second invention of this application, by giving a display change input from the input means, the display element provided corresponding to the input means starts blinking immediately after the input operation, and the result of the input is displayed on the display. When it is done, it stops blinking.

Therefore, even if the display changing operation of the display device is slightly delayed, it is understood that the input is accepted by the blinking operation of the light emitting element, and it is possible to prevent the operator from repeatedly operating the input means. As a result, it is possible to provide an easy-to-use two-wire type display device free from erroneous operation.

"Embodiment" FIG. 1 shows an overview of the present invention. In the figure, 200 is a main control unit, 300A to 300N are operating devices, 400A to 400N are display devices, and 600A.
~ 600N indicates a single actuator. The main controller 200, the operation devices 300A to 300N, and the display devices 400A to 400N are respectively connected to the two-wire signal transmission line 100, and display data is transmitted and received through the two-wire signal transmission line 100.

Operators 300A to 300 connected to one main controller 200
The number of N, display 400A to 400N, and single actuator 600A to 600N is the number 1
The number of display windows is from 0 to several 100, and the total number of display windows is 200
It is determined by the capacity of the storage device installed in, but normally controls 8000 display windows.

Furthermore, the names (person names, etc.) displayed in the display window can be displayed for about 256 people. That is, the total number of input means SW provided in the operating devices 300A to 300N and the single operating device 600 is 256. This number is determined by the capacity of the third memory device described later,
It can be expanded by increasing the storage capacity of the third memory.

In the following explanations, we will make a statement about the case where the system is applied to the employee's office leaving and leaving indicators. Therefore, the name displayed in the display window will be expressed as the user number attached to each job title.

In this example, the main controller 200, the manipulators 300A to 300N, and the displays 400A to 400N each include a microcomputer MPU, and each microcomputer is configured to control each unit.

In the first invention of this application, as shown in FIG.
Multiple display units 400 with multiple display windows WD for 200
A, 400B, 400C …… 400N and this multiple indicators 400A-400N
Input windows for switching the display status of each display window WD
SW and display window that displays the status input by this input means SW
Multiple operating devices 300A to 300N equipped with WD and a single display window
In a two-wire type display device configured by connecting a plurality of single display operating devices 300A to 600N equipped with WD and a single input means SW to the two-wire type signal transmission line 100, the display devices 400A to 400N are All display windows WD and operating device 300A
~ 300N and all input means of single operation device 600A ~ 600N
While assigning consecutive addresses to SW, the specific addresses among the addresses assigned to each display equipped with multiple display windows and the operating unit equipped with input means SW and the address assigned to a single operating unit A configuration is provided in which the main controller 200 is provided with a first storage device that stores the representative address of each device and stores model data indicating whether the device is a display device or an operation device at each storage position of the representative address. It is a feature.

This first storage device is shown by the reference numeral 12 in the block of the main controller 200 shown in FIG. The first memory 12 can be constituted by a RAM, and if a 1-byte address symbol is used, for example, it is possible to manage representative addresses of 256 devices. If a 2-byte (16-bit) address signal is used, the representative addresses of 36000 devices can be managed.

The representative address representing each device is the controller 300A shown in FIG.
.About.300N and display units 40A to 400N can be set by the address setting device indicated by reference numeral 20 in the block.
The address setter 20 can be configured by, for example, a DIP switch.

The representative address that can be set in the address setter 20 can be, for example, the minimum address (or maximum address) assigned to each device. This representative address is taken into the main controller 200 at the time of initial setting and written in the first memory 12. At the same time, the window number data and model data of each device to be written in the first memory 12 are input from the key board 11 (FIG. 2) provided in the main controller 200, or each of the operating devices 300A to 30A.
It can be input from a portable key board 700 (FIG. 2) which is used by connecting to 0N or display 400A to 400N or a single operation device 600.

The window number data representing the window number of each device input from the key board 11 is directly written in the window number storage area of the first memory 12. The window number data input from the portable key board 700 is stored in a storage device provided in each device, read by the main controller 20 and written in the first storage device 12 in the initial setting mode.

Here, main controller 200, actuators 300A to 300N, display 400A
~ 400N, single operating device 600A ~ 600N configuration of Figure 2 and 3
It will be described with reference to the drawings.

The main controller 200, the operation devices 300A to 300N, the display devices 400A to 400N, and the single operation devices 600A to 600N shown in FIG. 3 incorporate a microcomputer MPU, and the operation of each part is controlled by this microcomputer MPU.

As is well known, the microcomputer MPU includes a central processing unit (hereinafter abbreviated as CPU) 1, a read only memory (hereinafter abbreviated as ROM) 2, a RAM 3, and an input / output port 4.
, An input port 5, and an output port 6.

The input port 5 of the microcomputer MPU constituting the main controller 200 is connected to the keyboard 11 used for initial setting and the read output terminals of the first memory 12, the second memory 13, and the third memory 14. .

At the output port 6, the first memory 12, the second memory 13,
Each write input terminal of the third memory 14 is connected, and various data obtained through the two-wire type signal transmission line 100 are transferred to the first memory 12
Then, the operation of writing in the second memory 13 and the third memory 14 is performed. Along with this, a display 15 is connected to the output port 6 so that the setting contents can be monitored at the time of initial setting.

The input / output port 4 is inserted between the microcomputer MPU and the two-wire type signal transmission line 100, and the operation of outputting display data from the main controller 200 to the two-wire type signal transmission line 100 and the two-wire type signal transmission line Performs an operation to fetch display data from 100.

The operation unit 300 is a microcomputer MPU and input means SW
And a display element 301 and an address setting device 20.

The input means SW is composed of switches connected to a switch matrix circuit. One line group of the switch matrix circuit is time-division driven by the output port 6,
The other line group is connected to the input port 5, determines which switch has been operated, and is taken into the RAM 3.

As the display element 301, for example, a light emitting diode, an incandescent bulb, a liquid crystal, or a display element utilizing a mechanical reversing mechanism can be used, and these display elements are controlled to be turned on and off by a matrix circuit connected to the output port 6. It
Each display element 301 is attached to a position that illuminates a display window WD provided in each operation device 300A to 300N. In the illustrated example, a case where a light emitting diode is used as a display element is shown.

The input port 5 has an address setter 20 and a connection port 5A for a portable key board 700 used for initial setting and setting change.
Are connected.

The input data input from the input means SW is for each operation unit 300A ~
The controller inputs the input data stored in RAM3 to the inquiry from the main controller 200 when it is taken into the RAM3 of the microcomputer MPU that constitutes 300N and the single controller 600A to 600N.
Send back to 200.

The address set in the address setter 20 is also sent to the main control 200 by an inquiry from the main controller 200 at the time of initial setting,
It is taken into RAM3 of the main controller 200.

Furthermore, from the portable key board 700, each operating device 300A-300N
The address attached to the display window WD provided in (Fig. 1), the window number data, the user number data for the job title displayed in each display window WD, and whether it is the operator or not is the indicator. Enter the model data, etc. indicating whether or not the window address, the window number data, the user number data, and the model data are written in the RAM3 of each operation unit 300A to 300N, and the main memory 200
Is sent to the main storage device 200 by the inquiry from, and further transferred from the main storage device 200 to each of the display devices 400A to 400N.

Each of the display devices 400A to 400N includes a microcomputer MPU, a display element 401, and an address setting device 20. The input port 5 is connected to the connection port 5A of the portable key board 700 and the address setting device 20.

The display element 401 is connected to the output port 6. This display element 401 is lit by a matrix circuit connected to the output port 6 like the display element 301 of the operation devices 300A to 300N,
The display element 401 is controlled to be turned off, and each display element 401 is attached to a position that certifies each display window WD of the displays 400A to 400N (FIG. 2).

The single operation devices 600A to 600N are, as shown in FIG. 3, a microcomputer MPU, an address setting device 20, and an input means SW.
And a display element 601. Single controller 600
Each of A to 600N has one display window WD, and the light emitting element 601 is mounted at a position demonstrating this display window WD.

As described above, each operating device 300A-300N, display device 400A-400
N, the single operation devices 600A to 600N are provided with the address setting device 20, and the address setting device 20 sets the representative address of each device.

Therefore, using this representative address, the main controller 200 sends display data to each device and identifies the data sent from each device.

In other words, at the time of initial setting, each operation unit 300A to 300N and the display unit 40
A representative address of each device is set in the address setting device 20 provided in the 0A to 400N and the single operation devices 600A to 600N. This representative address is read by the main controller 200, and the first address of the main controller 200 is read.
It is stored in the storage device 12.

As a method of reading the representative address set in each device in the initial state into the main controller 200, the following methods can be considered.

All addresses attached to the display window WD of each device are accessed from the main controller 200 to check whether a representative address is set. In the address set on the representative address, the address is stored in the first memory 12 of the main controller 200 as the representative address. At the same time, if the window number data and model data of each device are set in the RAM 3 of each device, the window number data and model data are also transferred to the main controller 200 and written in the first memory 12.

The representative address is set in the address setting device 20 of each device, the representative address is input from the input key board 11 of the main controller 200, and the representative address of each device is written in the first memory 12. Along with this, the window number data and model data of each device are written in each representative address.

In this way, the representative address of each device, the window number data, and the model data are fetched into the first memory 12 provided in the main controller 200, so that the main controller 200 thereafter uses each of the representative addresses. Are sequentially accessed to exchange data.

The main controller 200 is provided with a second memory 13 in addition to the first memory 12, and the second memory 13 stores the user number data associated with the personal name displayed in each display window WD. This user number data is key board 11 of the main controller 200 at the time of initial setting.
From the portable key board 700 on each device side to the RAM 3 of the microcomputer MPU provided in each device, and the user number data stored in this RAM 3 is written to the main controller 200. It is output in response to a call from, is transferred to the main controller 200, and is written in the second memory 13.

The user number data stored in the second storage device 13 are all input means SW provided in each of the operating devices 300A to 300N and 600A to 600N.
It is expressed by adding a serial number to. That is, input means
The SW is provided with an address for receiving access from the main controller 200 and a user number for setting the window user. This user number is provided so that the window user can easily change the settings.

The main controller 200 is further provided with a third memory 14 in addition to the first memory 12 and the second memory 13. The third memory 14 stores the display data at each address accessed by using the user number stored in the second memory 13 as an address.

This display data indicates the data input from each input means SW of the operation devices 300A to 300N, and represents the display state of each display window WD of each display device 400A to 400N and each operation device 300A to 300N.

The display state of the display window WD is generally a binary value of coming to work and leaving work, but it is possible to use a light emitting element that emits light of different colors to turn on and off, and to use different colors to come to work, leave work, and make a business trip. It may be a four-valued one that indicates absence and the like. In the case of displaying four values in this way, the third memory 14 may have a memory capacity of 2 bits for each address.

The data stored in the first memory 12, the second memory 13, and the third memory 14 and the relationship between the data will be described with reference to FIG.

The display data ON / OFF is stored in each address of the third storage device 14 ,. .. are prepared for more than the number of users, and each address is assigned to a user number.

The addresses AD ₁ , AD ₂ , AD _{3 of} the second memory 13 are the display windows WD.
Corresponding to the address attached to the input means SW of the operation device 300A to 300N, and the user number data (address signal of the third storage device 14) at each address AD ₁ , AD ₂ , AD ₃ ... AD _N , ... Write… This writing is the key board 1 provided in the main controller 200.
1 or connection port 5 provided on each device 300A to 300N or 400A to 400N
This is done from a portable key board 700 that connects to A.

Addresses of the second memory 13 AD ₁ , AD ₂ , AD ₃ ... AD _N is the controller 30
0A-300N and number of input means SW of display 400A-400N and windows
Multiple address blocks AA, BB, CC ... NN depending on the number of WD
It is divided into Each address block AA, BB, CC ... NN
Determine the representative address of each device in. In this example, the minimum address in each address block AA, BB, CC ... NN is shown as a representative address. Addresses with diagonal lines in the figure
AD ₁ , AD ₈ ... indicate representative addresses.

The user number using the window WD or the input means SW is written in each address AD ₁ , AD ₂ , AD ₃ , AD _4, ... AD _N. If the total number of windows WD of the display devices 400A to 400N and the input means SW of the operation devices 300A to 300N is, for example, 8000, 8 Kbytes of memory is used.

The representative address of each device, the number of windows of each device, and the number of input means are stored in each address A ₁ , A ₂ , A ₃ , ... A _N of the first storage device 12. The representative address refers to the minimum address in each address block AA, BB, CC ... NN determined by the second memory 13, and the address number is stored in each address A _{1 to} A _N of the first memory 12. . Along with this, the number of windows of each device and the number of input means SW (hereinafter referred to as window number data) and model data are stored.

Representative addresses stored in the first memory 12 and the second memory 13,
Since the window number data and the user number data are initial setting data, for example, they are sent from the main controller 200 to each device at the time of daily startup, and the data related to self is written in the RAM3 of the microcomputer MPU provided in each device. .

On the other hand, the display data stored in the third storage unit 14 is always read out and sent to each device together with the representative address, and is compared with the display data stored in the RAM 3 of each device (see FIG. 5) to make an error. When the input means SW of the operation devices 300A to 300N is operated and a display change request is issued, the input data is sent to the main controller 200 together with the address and the user number, and the third storage device The display data written in the address corresponding to the 14 user numbers is rewritten.

The display element 301 corresponding to the input means SW operated at this time
Or 601 starts blinking. This blinking operation is executed in the blink mode of the microcomputer MPU, for example.

When the display data written in the third storage device 14 is rewritten, the address code (user number) of the third storage device 14 storing this display data is read from the second storage device 13, A representative address of the address block containing the user number, the corresponding window address, the user number, and the display data are output to the two-wire signal transmission line, and the display stored in the device requested to change the display is displayed. The data is rewritten and the display is changed.

When the display data is sent back from the main controller 200, the microcomputer blinking the display element 301 takes in the display data and replaces the display data stored in the RAM 3 with the display element 301 or 601. Stop the blinking operation and indicate that the display on the display has reversed to the target state. When the input means SW is operated, the display elements 301 and 601
When the input operation is performed in the off state, the state changes to the blinking state, and when the blinking state changes to the constant lighting state, and when the input operation is performed in the constant lighting state, the blinking state changes and the blinking state changes to the off state. There is.

When the display change is executed, the main controller 200 returns to the normal mode, returns to the state of sequentially accessing only the operation devices 300A to 300N and the single operation devices 600A to 600N, and the display change request is issued from the operation device. Search whether or not. This search operation is executed by the microcomputer MPU which constitutes the main controller 200,
The microcomputer MPU constitutes the search means.

In addition to the representative address stored in the first storage device 12, a common address is given to all the devices, and a two-wire display device capable of calling all at once can be configured by this common address.

As this common address, an arbitrary address assigned to the window WD can be used, but can be, for example, the final address or the top address. The example shown in FIG. 4 shows a case where the final address AD _N is a common address, and this common address AD _N is stored in the final address A _N of the first memory 12. In addition, each operation device 300A to 300N and display device 400A to 400
N, common addresses are stored in the single operation devices 600A to 600N. This memory is sent to each device from the main controller 200 each time it is started, and the R of the microcomputer MPU provided in each device is stored.
It can be written in AM3 or pre-written in ROM2.

By setting the common address in this way, the same data, such as a start command, a stop command, and a reset command, can be sent to all of the devices all at once, and a predetermined process can be completed in a short time.

"Effects of the Invention" As described above, according to the first invention of this application, the main controller 200 has only the operation devices 300A to 300N and the single operation devices 600A to 600N according to the model data in a state where there is no normal display change request. To monitor whether or not there is a display change input.

The operation unit 300A to 300N and the single operation unit 600A to 600N are the indicators 40
Since it is less than the number of 0A to 400N, the time for sequentially accessing all of the operating devices 300A to 300N and the single operating devices 600A to 600N becomes short. Therefore, even if a display change request is issued, the display change request can be taken into the main controller 200 within an extremely short time, and the display change request can be sent to each display device 400A to within a short time. It can be transferred to each display unit of 400N and operating devices 300A to 300N.

According to the second invention of the application, the operating devices 300A to 300N and the single operating device 60 are operated until the display on the display is actually inverted.
Since the display elements 301 and 60 of 0A to 600N are structured to blink, the time from the input of the display change request to the transfer of the display change request to the display units of the respective display units and the operation unit becomes slightly longer. Even by blinking the display elements 301 and 601, it can be displayed that the display data is being transferred. Therefore, since the display does not change despite the input of the display change request, it is possible to prevent an erroneous operation such as an input operation again, and it is possible to provide a highly reliable two-wire display device.

[Brief description of drawings]

FIG. 1 is a block diagram for explaining the overall configuration of the present invention, FIG. 2 is a block diagram for explaining the configuration of the main part of a two-wire type display device according to the present invention, and FIG. 3 is for the present invention. A block diagram for explaining the structure of a single operating device used,
4 and 5 are diagrams for explaining the configuration and operation of the main part of the present invention, FIG. 6 is a connection diagram for explaining the conventional technique, and FIG. 7 is a two-wire type display device. FIG. 8 is a block diagram for explaining the outline, and FIG. 8 is a block diagram for explaining the conventional technique. 100: Two-wire signal transmission line, 200: Main controller, 300A to 300N:
Operation device, 400A to 400N: display device, WD: display window, SW: input means, 12: first storage device, 13: second storage device, 14: third storage device.

Front page continuation (72) Inventor Noriyuki Matsuda 5-6-12 Maehara-cho, Koganei-shi, Tokyo Co., Ltd. TAII Citizen Koganei Plant (56) References JP-A-60-164802 (JP, 164,802) A) Japanese Patent Publication Sho 63-31785 (JP, B2)

Claims (2)

[Claims] 1. A plurality of display devices each having a plurality of display windows for displaying information related to a user for each display window, and a plurality of display devices for switching display states of the display windows of the plurality of display devices. A plurality of operating devices equipped with input means are connected to the main controller by a common two-wire type signal transmission line, representative addresses assigned to the respective display devices and the respective operating devices, and the display device or the operating device. A first storage unit for storing model data indicating whether or not, and a correspondence between an address uniquely assigned to each display window of the plurality of display units and each input means of the operation unit and a user number are stored. A second memory,
The main controller is provided with a third memory for storing display data indicating the relevant information of the user with the number of the user as an address, and the main controller uses only the model data for each of the operating devices. The means for calling by sending the representative address, the user's number from the operation device and the display data thereof are input, and the second storage device is referred to for corresponding use of the third storage device. Means for rewriting the display data of the user's number, and by sending the representative address of the display device only to the display device by the model data, and also calling the user's number of the third storage device and the display data thereof. And a means for doing so, when the operation device is called by its representative address,
The display device is provided with means for transmitting data indicating the state of the operation input means as display data together with the user's number, and the display stores the relationship between the address given to the display window and the user's number, When it is called by its own representative address, a means for receiving the user number and its display data sent thereafter and displaying the corresponding display data on the display window corresponding to the user number is displayed. Two-wire display device equipped. 2. A plurality of display devices each having a plurality of display windows for displaying information related to a user for each display window, and a plurality of display devices for switching display states of the respective display windows of the plurality of display devices. Input means and a plurality of operating devices equipped with corresponding display elements are connected to the main controller by a two-wire signal transmission line, and the representative addresses assigned to the respective displaying devices and the respective operating devices are stored. A first storage device, a second storage device for storing the correspondence between an address uniquely assigned to each display window of the plurality of display devices and each input means of the operating device, and a user number; The main controller is provided with a third memory for storing display data indicating the relevant information of the user by using the number of No. as an address, and the main controller sends the representative address to each of the operating units to call it. From the above operation device Means for inputting a user's number and its display data to refer to the second storage device and rewriting the display data of the corresponding user's number in the third storage device; and to the display device, Means for sending and calling the representative address and for sending the user number of the third memory and the display data thereof,
After the display data is sent, a means for transmitting the data designating the representative address and the display data to an operating device having a display window corresponding to the changed display data and a corresponding display element is provided. When the input means is operated, the means for blinking the display element corresponding to the input means and the data indicating the state of the operation input means when called by the representative address of the user are used as display data of the user. The display is provided with a means for transmitting with a number and a means for stopping the blinking of a designated display element called by its own representative address, and the above-mentioned display is related to the address given to its display window and the user's number. When the user's representative address is stored, the user's number and the display data sent thereafter are received, and the display window corresponding to the user's number. And are two-wire display device comprising means for the display corresponding to the display data.