JPH02263297A - Two-wire type call display device - Google Patents

Abstract

PURPOSE:To eliminate necessity for preparing a calling device besides an incoming / outgoing display device and to reduce economical burden by connecting a manipulation device for calling and a display for calling to a two-wire type signal transmission line which constitutes the signal transmission line of a two- wire type incoming / outgoing display device. CONSTITUTION:Besides manipulation devices 300A-300N and 600A-600N to be provided for switching the display of incoming / outgoing, manipulation devices 800A-800N for calling and a display 900 for calling to display a calling state according to an input are separately added and calling function is added to the two-wire type incoming / outgoing display as well. Thus, even when the calling device is not set besides the office incoming / outgoing display device, the calling function can be added to this office incoming / outgoing display device as well only by setting the office incoming / outgoing display device to display office incoming / outgoing states.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" This invention relates to a two-wire call display device that can be used in companies, government offices, hospitals, etc.

``Prior art'' As proposed in ``Japanese Patent Publication No. 31785/1985,'' the present applicant uses a two-wire signal transmission line to control a display device with a large number of display windows to display arrival and departure information. We have proposed a two-wire display device that performs this function.

This type of display device, which has been used in the past, including the two-wire display device proposed earlier, is equipped with a switch on the operating device, and this switch is assigned to a user. By operating the switches assigned to them, users can control the lights in the display windows assigned to them on the display devices placed in various places to turn on and off, and the lights can be turned on and off to indicate when they are at work or when they are leaving work. It is used to display.

Furthermore, by changing the color of the light emitted by the light source that illuminates the display window, it is also possible to display not only arrival and departure from work, but also business trips, meetings, and the like.

[Problems to be Solved by the Invention] This type of exit/exit display device is mainly used to display the location of a user. For this reason, in a building equipped with this type of exit/exit display device, calls between specific people, such as VIPs and secretaries, patients and nurses, etc., must be made using other intercoms, buzzers, chimes, etc. The device is used to make the call.

Therefore, a calling device must be installed in addition to the exit/exit display device, which imposes a financial burden on the installer, and there is also the drawback that the wiring is redundantly installed in the room, resulting in unnecessary wiring.

"Means for Solving the Problem" The present invention includes a plurality of display devices each having a plurality of display windows, and an operation device provided with an input means for switching the display state of each display window of the plurality of display devices. are connected to the main controller by a common two-wire signal transmission path, and the state of the display window assigned to the input means provided on each operation device can be switched by operating the input means. In addition to the operating device provided for switching the exit/exit display, the two-wire display device is equipped with a calling operating device and a calling display device that displays the calling status using the input means of this calling operating device. It is a two-wire exit/exit indicator with a calling function added.

Therefore, according to this invention, without installing a calling device outside of the work arrival/leaving display device, simply by installing the work attendance/leaving display device that displays the work arrival/leaving status, a calling function can be added to the work attendance/leaving display device. It is possible and convenient.

"Example" The outline of the two-wire entrance/exit display device will be explained in advance using Fig. 1. In the six figures, 200 is the main controller, 300A to 30ON are the operating devices, 400A to 40ON are the display devices, and 600A to 60ON are the main controllers.
indicates a single operator, these main controller 200, operator 3
00A to 30ON, display 400A to 40ON, and single operator 600A to 60ON are two-wire signal transmission line 1, respectively.
00, transmits and receives operation input data and display data through this common two-wire signal transmission path lOO, and is connected to one main controller 200.
30ON, display 400A to 40ON, and single operator 6
The number of 00A to 60ON is approximately several tens to several hundred, and the total number of display windows is determined by the capacity of the memory provided in the main controller 200, but typically 8000 display windows are controlled.

Furthermore, the names (personal names, etc.) displayed on the display window can be for about 256 people. In other words, the controller 3008~
30ON and input means SW provided in the single operator 600
The total number of cases will be 256 people.

This number is determined by the capacity of the third storage device, which will be described later, and can be expanded by increasing the storage capacity of the third storage device.

In the following explanation, we will explain the case where it is applied to an indicator for employees coming to work and leaving work. Therefore, the name displayed on the display window will be expressed as a user number attached to each job title.

This arrival and departure display device has each operating device 300A to 30ON.
A user is assigned to each of the input means SW provided in the. The user operates the input means SW assigned to him/her to display the arrival and departure information.

Each user's name or job title is written in each display window WD of the display devices 400A to 40ON, and the state of coming to work and the state of leaving work are displayed. The display devices 400A to 40ON do not all have the same number of display windows, but the number of display windows is selected depending on the number of users who require entry/exit display for each installation location. Therefore, not all users' display windows are assigned to each display window WD of all the displays 400A to 40ON.

In this invention, in a two-wire exit/exit display device configured by connecting a plurality of terminal devices to a common two-wire signal transmission path 100, a call is made separately from the exit/exit display operating devices 300A to 30ON. The present invention proposes a two-wire display device having a configuration including operating devices 800A to 80ON and a calling display 900 that displays the calling status by input means of the calling operating devices.

For example, the call operation devices 800A to 80ON are used in private rooms of VIPs,
Or assigned to a hospital patient. Call display 900
is installed in a secretary's room or a nurse's room in a hospital, and when any one of the call operating devices 800A to 80ON is operated, the call display assigned to that call operating device 8008 to 80ON is displayed. The display window WD of the device 900 and the display window WD on the operation device side start blinking, and a sounding body such as a buzzer provided on the call display 900 is activated to indicate that a call operation has been performed.

In response to the call, the called party presses the input means SW provided corresponding to the display window WD which repeatedly blinks. This pressing operation causes the sound generating body to stop producing sound and also switches the blinking lighting of the display window WD to continuous lighting. When the input means of the call display 900 is pressed again, the display window W
The lighting of D is turned off.

FIG. 2 shows an example of the implementation structure of the call operating devices 800A to 80ON and the call display 900 that operate in this manner.

The call operating devices 800A to 80ON shown in FIG. 2 may have the same structure as the single operating devices 600A to 60ON. In the following explanation, the calling operation device 800A~
80ON will be explained.

The calling operation devices 800A to 80ON are composed of a microcomputer MPU, an input means SW, a display element 801, and an address setting device 20.

As is well known, the microcomputer MPU is composed of a central processing unit 1, a ROM 2 that stores programs, a RAM 3 that stores data, an input/output port 4, an input port 5, and an output port.

The input/output boat 4 is interposed between the two-wire signal transmission line 100 and the microcomputer MPU, and the two-wire signal transmission line 1
The operation of acquiring signals from 00 and the microcomputer M
An operation is performed to output a signal from the PU to the two-wire signal transmission line 100.

The address setting device 20 is each calling operation device 800A to 80O.
In addition to N, each terminal is provided with one for each terminal, and the address of each terminal is set. Therefore, the main controller 200 and each terminal device use the address set in the address setting device 40 to exchange data.

The RAM 3 contains input data input from the input means SW,
Display data etc. sent from the main controller 200 are stored. Each time the input means SW is operated, the input data is rewritten, for example, from "lJ" to "0" and from "0" to "l".

When the input data is rewritten, the central processing unit 1 outputs a data transmission request to the two-wire signal transmission line 100.

When the main controller 200 receives a data transmission request, it grants transmission permission to the terminal that issued the data transmission request.

The terminal to which transmission permission has been granted sends the rewritten input data to the main controller 200, and upon receiving the input data, the main controller rewrites the data in its own storage device 14 (FIG. 3). At the same time, the rewritten data is sent to the two-wire signal transmission line 100.

At this time, destination addresses of other terminals including the terminal that transmitted the input data are attached to the sent data, and the rewritten data is delivered to the predetermined terminal. The method of adding the destination address to the rewritten data will be explained later using Figures 4 and 5, but the outline is as follows: When a request is issued, a table is prepared to determine which display device the changed data should be sent to, and the data is sent with a destination address attached with reference to this table.

When the input means SW of the call operation devices 800A to 80ON is operated, the data sent back from the main controller 200 includes addresses pointing to a plurality of display windows provided in the call display 900 and a display change request. The address of the originating calling device, for example 800A, is added and sent back.

Therefore, when the rewritten data is sent back from the main controller 200, the call operating devices 800A to 80ON write the data into the display data storage section of the RAM 3.

Also, the call display 900 detects that the sent data has an address pointing to the display window WD^~WD provided in itself, takes in the data, and displays the call display 900. R of the constituent micro combinator MPU
Import to AM3.

When the calling operation device 800A takes in the data sent from the main m device 200, the microcomputer MPU causes the display element 801 to blink. This blinking operation is executed by a blink function provided in the microcomputer MPU.

On the other hand, the call display 900 is the call operation device 800A to 800.
Like ON, the microcomputer MPU, input means sw, -sw, display 901, sounding body 902,
It is composed of an address setting device 20.

The display 901 has a plurality of display windows WDA, WD.

WD,...WD, are provided, and each display window WDA, WD
,,WD,...WD are each calling operation device 8008-8.
Corresponding to 0ON, calling operation devices 800A to 80O
When N is operated, the calling operation device 800A to 80ON is activated.
Display window WD associated with.

~WI), 1 starts blinking. At the same time, a sounding body 902 such as a chime or a buzzer is activated to indicate that the call is being made.

By operating the input means SWA-SWN attached to the called display window, the blinking of the display windows WDA-WD, 4 and the driving of the sounding body 902 are stopped.

At the same time, the blinking of the display window on the display side is switched to continuous lighting.If the corresponding input means SW is operated again on the display 900 side, the continuous lighting is turned off. The response data generated by operating the input means on the display side is sent to the main controller 20.
0 and is sent back to the calling controller 8 via the main controller 200.
Response data is sent to 00A to 80ON. When the response data is taken into the calling operation devices 800A to 80ON, the microcomputer MPU stops the blinking drive of the display element 801 and turns off the light. This turning off indicates that the called party has answered.

These series of operations are performed by the calling operation devices 800A to 80ON.
It is executed by the microcomputer MPU constituting the call display 900 and the microcomputer programs stored in the main controller 200.

As described above, the call operation devices 800A to 80ON and the call display 900 are connected to the two-wire signal transmission line 100 and the main controller 2.
It operates by being incorporated into the exit/exit display device via 00.

Next, the entry/exit display device will be explained.

The two-wire entry/exit display device described here includes all the display windows WD and operating devices 300A to 30ON and single operating devices 6008 to 60 that the indicators 400A to 40ON shown in FIG. 1 have.
Each display 400 has consecutive addresses assigned to all the input means SW of the ON, and has a plurality of display windows.
A specific address among the addresses assigned to the operating devices 300A to 30ON equipped with 8 to 40 ON and a plurality of input means SW, and an address assigned to the single operating device 600A to 60 ON are stored as representative addresses of each device. 1st
This configuration is characterized by a storage device provided in the main controller 200.

Therefore, addresses are also given to the previously described call operating devices 800A to 80ON and the call display 900, and they operate as one terminal of the exit/exit display device.

The first memory is provided within the main controller 200 shown in FIG. In the figure, the block of the main controller 200 is indicated by the reference numeral 12. This first memory 12 can be constructed from RAM, and can manage representative addresses of 256 devices if, for example, a 1-byte address symbol is used. Furthermore, if a 2-byte (16-bit) address signal is used, representative addresses of 36,000 devices can be managed.

The representative address representing each device is the operating device 30 shown in FIG.
The settings can be made using an address setter indicated by the reference numeral 20 in the blocks 0A to 30ON and the displays 400A to 40ON. This address setter 20 can be configured by, for example, a dip switch.

The representative address 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 stored in the first memory 12. At the same time, the window number data and model data of each device to be written to the first memory 12 can be entered from the keyboard 11 (FIG. 3) provided on the main controller 200, or from each operating device 30.
Portable keyboard 70 used by connecting to 0A~30ON, display 400A~40ON, or single operator 600
0 (Figure 3).

Window number data representing the number of windows of each device inputted from the keyboard 11 is directly written into the window number storage area of the first memory 12. Further, the window number data input from the portable keyboard 700 is stored in a memory provided in each device, read into the main controller 200 in the initial setting mode, and written into the first memory 12.

Here, the main controller 200, the operating devices 3008 to 30ON,
The configuration of the displays 400A to 40ON will be explained using FIG. 3.

Main controller 200, operating devices 300A to 30ON.

Display 1i400A to 40ON is microcomputer M
It has a built-in PU, and the operation of each part is controlled by this microcomputer MPU.

As described above, the microcomputer MPU is composed of a central processing unit 1, a ROM 2, a RAM 3, an input/output port 4, an input port 5, and an output port.

Microcombi configuring the main controller 200, Eta MP
Input port 5 of U has keyboard 11 used for initial settings etc.
and a first memory 12, a second memory 13, and a third memory 14.
Connect each successive output terminal of

These first memory device 12 and second memory device 1 are in the output port.
3. Connect each write input terminal of the third storage device 14 and transfer various data obtained through the two-wire signal transmission path 100 to the first
The operation of writing to the memory 12, the second memory 13, and the third memory 14 is performed.

Along with this, a display 15 is connected to the output port so that the settings can be monitored during initial settings.

The input/output boat 4 is inserted between the microcomputer MPU and the two-wire signal transmission line 100, and performs the operations of outputting display data from the main controller B 200 to the two-wire signal transmission line 100, and the two-wire signal transmission. The operation of fetching display data from the path 100 is performed.

The operating device 300 includes a microcomputer MPU, input means SW, a display element 301, and an address setting device 20.

The input means SW is constituted by a switch connected to a switch matrix circuit. One group of lines of the switch matrix circuit is time-divisionally driven by the output port, and the other group of lines is connected to the input port 5, and it is determined which switch has been operated and the result is stored in the RAM 3.

The display element 301 can be, for example, a light emitting diode, an incandescent bulb, a liquid crystal, or another display element using a mechanical reversing mechanism, and these display elements are controlled to turn on and off by a matrix circuit connected to the output port. .

Each display element 301 is attached at a position to illuminate a display window WD provided in each of the operating devices 300A to 30ON.The illustrated example shows a case where a light emitting diode is used as the display element.

The input port 5 is connected to the address setting device 2o and a connection port 5A of a portable keyboard 700 used at the time of initial setting and setting change.

The input data inputted from the input means SW is transmitted to each operating device 30.
0A to 30ON and the single operating device 600A to 60ON are stored in the RAM3 of the microcomputer MPU, and the operating device is RA in response to the timing from the main controller 200.
The input data stored in M3 is sent back to the main controller 200.

Furthermore, the address set in the address setting device 20 is also set in the main controller 200 depending on the timing of the main controller 200 at the time of initial setting.
and is taken into the RAM 3 of the main controller 200.

Furthermore, from the portable keyboard 700, each operating device 300A~
The address attached to the display window WD provided by the 30ON (Fig. 1), the number of windows data, the user number data attached to the job title displayed on each display window WD, and the display whether the self is an operating device. Enter the model data etc. indicating whether it is a device,
These window addresses, window number data, user number data, and model data are stored in the RA of each controller 300A to 30ON.
M3, and sent to the main controller 200 according to an arrangement from the main controller 200, and further transferred from the main controller 200 to each display 400A to 40ON.

Display units 400A to 40ON are microcomputer MP
It is composed of a U, a display element 401, and an address setting device 20. The input boat 5 has a portable keyboard 700
The connection port 5A and the address setting device 20 are connected.

A display element 401 is connected to the output port.

This display element 401 is controlled to turn on and off by a matrix circuit connected to the output port, similarly to the display elements 301 of the operating devices 3008 to 30ON, and each display element 40
1 is each display window W of the display devices 400A to 40ON (Fig. 3)
It is installed in a position that illuminates D.

Since the single operating devices 600A to 60ON have the same configuration as the calling operating devices 800A to 80ON shown in FIG. 2, a description of the configuration will be omitted here.

As described above, each operating device 300A to 30ON.

Display 400A~40ON, single operator 600A~60
The ON is provided with an address setting device 20, and the representative address of each device is set by this address setting device 20.

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

In other words, at the time of initial setting, each operating device is set to 300A to 30ON.
Indicator 400A~40ON and single operator 600A~6
The representative address of each device is set in the address setting device 20 provided at 0ON. This representative address is the main controller 200
and stored in the first memory 12 of the main controller 200.

As a method of reading the representative address set for each device into the main controller 200 in the initial state, the following methods (1) and (2) can be considered.

(2) Access all addresses attached to the display window WD of each device from the main controller 200 and check whether a representative address is set.

At an address where a representative address has been set, that address is stored in the first memory 12 of the main controller 200 as a 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 the first memory 12
written to.

■ Set a representative address in the address setter 20 of each device, input the representative address from the input keyboard 11 of the main controller 200, and write the representative address of each device in the first memory 12; Write the window number data and model data of each device to each representative address.

In this way, the representative address, window number data, and model data of each device are taken into the first memory 12 provided in the main controller 200, so that the main controller 200 can use this representative address to control each device. are accessed in order and data is exchanged.

The main controller 200 has a second memory 1 in addition to the first memory 12.
3, and this second storage device 13 stores user number data associated with the person's name displayed on each display window WD. This user number data is written directly into the second memory 13 from the keyboard 11 of the main controller 200 during initial settings, or written into the RAM 3 of the microcomputer MPU provided in each device from the portable keyboard 700 on each device side. , the user number data stored in this RAM 3 is output in response to a call from the main controller 200, transferred to the main controller 200, and written into the second memory 13.

The user number data stored in the second storage device 13 is represented by sequential numbers attached to all input means SW provided in each of the operating devices 300A to 30ON and 600A to 60ON. In other words, the input means SW is given an address for receiving access from the main controller 200 and a user number for setting the user preference of the window. This user number is provided to allow window users to easily change 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. This third storage device 14
is accessed using the user number stored in the second storage device 13 as an address, and stores display data in each address.

This display data indicates data input from each input means SW of the operation devices 300A to 30ON, and each display device 400A
~40ON and operation device 3008~30ON each display window W
Indicates the display state of D.

Generally, the display status of the display window WD is two-valued, ``Coming to work'' and ``Leaving work.'' However, in addition to turning on and turning off, light-emitting elements with different emission colors are used to display color-coded information such as ``Coming to work, Leaving work, Business trip, Absence, etc.'' In some cases, it may be a four-value display. When displaying four values in this manner, the third memory 14 may have a storage capacity of 2 bits for each address.

Each data stored in the first storage device I2, the second storage device 13, and the third storage device 14 and the relationship among each data will be explained using FIGS. 4 and 5.

Each address of the third storage device 14 ■, ■, ■, ■...
...Display data 0N10FF is stored in [Yes].

Addresses of this third storage device 14■,■,...■
are prepared for the number of users, and each address ■, ■, ■.

......■ is assigned to the user number. Therefore, the users of the calling operation devices 800A to 80ON are given a user number for displaying entry/exit and a calling user number.

Addresses A Dr , A D t of the second storage device 13
, A D s... are indicators 400A to 40O
N, each display window WD of the call display 900, and the operation device 300
Each address AD corresponds to the address attached to the input means SW of A to 30ON and the calling operation devices 80QA to 80ON.
l, A D t, A D s...A D
Write the user number data (address signal of the third storage device 14) ■, ■, ■...■ to M. This writing can be done using the keyboard 11 provided in the main controller 200 or each device 300A.
~30ON or 400A~Connection port 5A provided in 40ON
This is done from a portable keyboard 700 connected to the computer.

Addresses AD+, ADg, ADs of the second storage device 13...
...AD, operation devices 300A to 30ON, call operation devices 800A to 80ON, and display devices 400A to 40O
It is divided into a plurality of address blocks AA, BB, CC, . . . NN according to the number of N input means SW and the number of windows WD. Each address block AA, BB, CC.
...Determine the representative address of each device in the NN.

In this example, each address block AA, BB, CC...
. . . The hatched address A D l in FIG. 5 shows the case where the smallest address in NN is the representative address,
A D @... indicates a representative address.

Each address AD,,AD! ,ADff,AD,...
...AD.

The user number for using the window WD or input means SW
,■,■,...0 indicator 400 for writing [Yes]
If the total number of windows WD of A to 40ON and input means SW of operating devices 300A to 30ON is, for example, 8,000, an 8-byte memory is used.

Each address A I, A ! of the first memory 12 , A
3. . . . Am stores the representative address of each device, the number of windows for each device, and the number of input means. The representative address is stored in each address block AA, BB determined by the second memory 113.
.

CC... refers to the smallest address in NN, and this address code is assigned to each address A1 to AM of the first memory 12.
to be memorized. Along with this, the number of windows of each device and input means SW
(hereinafter referred to as window number data) and model data are stored.

Since the representative address, window number data, and user number data stored in the first storage device 12 and the second storage device 13 are initial setting data, they are sent from the main controller B unit 200 to each device at the time of daily startup, and are data related to is written to the RAM 3 of the microcomputer MPU provided in each device.

On the other hand, the display data stored in the third storage device 14 is always read out and sent to each device along with the representative address, and is compared with the display data stored in the RAM 3 of each device (see Figure 6) to prevent errors. In addition, the operator 300
When the input means SW of A to 30ON is operated and a request to change the display is issued, the input data is sent to the main controller 200 along with the address and user number, and the input data is sent to the main controller 200.
The display data written to the address corresponding to the user number will be rewritten.

Display element 3 corresponding to the input means SW operated at this time
01 starts blinking. This blinking operation is executed, for example, by the link function of the microcomputer MPU.

When the display data written in the third storage device 14 is rewritten, the third storage device 14 that had stored this display data
The address code (user number) is read out from the second memory 13, and the representative address of the address block containing the corresponding user number, the corresponding window address, the user address, and the display data are transmitted via two-wire signal transmission. The display data stored in the device requested to change the display is rewritten and the display change is executed.

When the display data is sent back from the main controller 200, the microcomputer that causes the display element 301 to blink takes in this display data and rewrites the display data stored in the RAM 3, and also updates the display element 3.Ol. Stops the blinking operation and indicates that the display has reversed to the desired state. When the input means SW is operated, the display element 3
The operation of 01 and 601 is that if you perform an input operation when the light is off, it will change to a blinking state, and from a blinking state to a lit state, and if you perform an input operation while it is lit, it will become a blinking state, and then from a blinking state to an off state. There are cases.

When the display change is executed, the main controller 200 returns to the normal mode, and the operating devices 300A to 30ON and the single operating device 60
Returning to the state of sequentially accessing only 0A to 60ON, a search is made to see if a display change request has been issued from the operating device.

This search operation is executed by the microcomputer MPU constituting the main controller 200.
will constitute the search means.

In addition to the representative address stored in the first memory 12, a common address can be given to all the devices, and a two-wire display device can be constructed in which simultaneous calling is possible using this common address.

As this common address, any address assigned to the window WD can be used, and for example, it can be the final address or the top address.

The example shown in FIG. 5 shows a case where the final address A D M is a common address, and this common address A D s is stored in the final address A0 of the first storage device 12.

In addition, each operating device 300A ~ 30ON and display device 400A ~
A common address is stored in 40ON and the single operating devices 600A to 60ON. For example, this memory is sent from the main controller 200 to each device each time it is started, and is written to the RAM 3 of the microcomputer MPU provided in each device, or is written to the ROM.
2 can be written in advance.

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

"Effects of the Invention" As explained above, according to the present invention, the calling operation devices 800A to 80ON and the calling display are connected to the two-wire signal transmission path 100 constituting the signal transmission path of the two-wire exit/exit display device. 900
These call operating devices 800A to 80ON and the call display 900 can be operated via the main controller 200.

Therefore, the signal transmission path of the two-wire exit/exit display device can be shared as the signal transmission path of the calling device, and the amount of indoor wiring can be reduced.

Furthermore, since there is no need to provide a calling device such as an intercom or a buzzer chime in addition to the exit/exit display device, the economic burden can be reduced.

Further, according to the calling device of the present invention, when making a call,
When the called party performs a response operation, it is displayed that there has been a response, so the calling party knows that the other party understands that the other party has been called, and is convenient in this respect.

In the above description, the case where the call operating devices 800A to 80ON and the exit/exit display operating devices 300A to 30ON are separated, but the calling operating devices 800A to 80ON and the exit/exit display operating devices 300A to 30ON can be separated. They can also be stored in a common case.

It is also possible to use an input means, a display device, and a micro combiator in common, and use a mode changeover switch to switch between the call operation device and the exit/exit display operation device.

[Brief explanation 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 main parts of a two-wire call display device according to the present invention, and FIG. FIGS. 4 to 6 are block diagrams for explaining the structure of a single operating device used in the present invention, and FIGS. 4 to 6 are diagrams for explaining the structure and operation of the main parts of the present invention. 100: Two-wire signal transmission line, 200: Main controller, 30
0A to 30ON: Operating device, 400A to 40ON: Display, WD: Display window, SW: Input means, 12; First memory,
13: second storage device, 14: third storage device.

Claims (1)

[Claims] (1) A. A plurality of display devices equipped with a plurality of display windows, a plurality of operation devices equipped with a plurality of input means for switching the display state of each display window of the plurality of display devices, and a single A single operating device equipped with input means is connected to the main controller via a two-wire signal transmission line, and the state of the display window assigned to the input means of each operating device can be switched by operating the input means. In the two-wire display device configured as follows: B. A calling operation device provided separately from the above-mentioned operation device; C. A calling display device that displays the calling status by input means of the calling operation device; A two-wire call display device with a