JPH0113158B2 - - Google Patents

Description

[Detailed Description of the Invention] This invention is applicable to, for example, the attendance of employees of companies, government offices, etc.
Regarding a device for displaying the status of leaving work, the present invention aims to provide a two-wire transmission type display device that prevents display inconsistency even in the event of a power outage.

The present applicant had previously proposed a two-wire transmission type display in ``Japanese Patent Application No. 116848/1983.''

The outline of this two-line display device will be explained using FIGS. 1 and 2. 101 shown in FIG. 1 is a display device. The display device 101 includes, for example, a plurality of display windows 10
2, for example, the name of an employee is written in this display window 102, and by lighting up a light source provided behind the employee, it is displayed that the employee is at work, and when the light is turned off, it is displayed that the employee has left work. shall be taken as a thing.

103 and 104 are each window 102 of the display 101
This figure shows an operating device for operating the to display state for coming to work and leaving work. The operating device 103 is for a private room and is assigned to one employee. Reference numeral 104 indicates an operating device that is shared by a plurality of employees. Each operating device 103 and 104 is provided with a push button switch 105 and a light emitting element 106 for monitoring corresponding to each push button switch 105. When the push button switch 105 is pressed, the display window 101 of the display 101
The display state of 02 is reversed. In other words, for example, if you press the push button switch 105 when you are at work,
Display device 101 corresponding to this push button switch 105
The state of the window is reversed to the leaving state. The monitor light emitting element 106 lights up when the window 102 of the display 101 is displaying the status of coming to work, and is structured so that it is possible to monitor the status of coming to work and leaving the office even if the display 101 is not visible. .

107 is a display device 101 and operating devices 103 and 104
This shows a reference signal generator for synchronous operation. These display devices 101, operating devices 103, 10
4. The reference signal generator 107 is connected to the two-wire transmission line 1.
08, and the display state of the display 101 is controlled via this two-wire transmission line 108.

The state of this control will be explained using FIG. 2. The reference signal generator 107 outputs clock pulses P ₁ -P ₆₄ as shown in FIG. 2, for example. Clock pulses P ₁ to P ₆₄ are defined as one cycle, and a rest period T ₀ of two pulses is provided after P ₆₄ . During this rest period T ₀ , the display 101 and the operating devices 103 and 104 detect the cycle, and the display 101 and operating devices 103, 104
are configured to operate in synchronization with each other.

Here, clock pulses _P1 to _P64 are used as addresses assigned to each employee. In other words, each operating device 103, 104 receives a clock pulse.
Addresses P ₁ to _{P 64} are designated, and the area immediately after each clock pulse is divided into three, for example, and the three divided areas are used to transmit office arrival, leaving office, and display change control signals.

When transmitting control signals corresponding to multiple display windows using the two-wire transmission line 108 in this way,
The relationship between the operating devices 103, 104 and the display device must be used in a time-sharing manner. Therefore, each pushbutton switch 105 of each operating device 103 and 104 is operated to specify an address, and to transmit an operation signal when it detects that the address has come its turn.

The display 101 and the operating devices 103 and 104 are provided with a memory, and the operating status is stored in this memory. Further, the operation information transmitted from each of the operation devices 103 and 104 is stored in the memory of the display 101 and also in the memory provided in the reference signal generator 107. Since the memory provided in the reference signal generator 107 stores all information, a backup mechanism using a battery is provided so that the memory will not be lost even in the event of a power outage.

The display 101, the operating devices 103 and 104, and the reference signal generator 107 are configured to take in commercial power from a commercial power outlet in each room and rectify it to obtain power. Therefore, the display device 101 and the operating device 1
03, 104 and reference signal generator 107 all experience a power outage at the same time.

Therefore, in the device proposed earlier, when the power outage is restored, the reference signal generator 107 detects this, and after the power is restored, the information stored in the memory before the power outage is transferred to the display 101 and the operating devices 103 and 104. However, the display state of the display 101 and the monitor state of the operating devices 103 and 104 are returned to their original states.

<Disadvantages of the previously proposed device> With this structure, for example, one display 10
If a power outage occurs in only one part of the display unit 101, or if a partial power outage occurs in the part of one display unit 101 due to reasons such as the plug being pulled out from the power outlet, the reference signal generator 107 outputs information. Do not perform simultaneous transfer operations. For this reason, there is a drawback that the display on the display in the area where the power has been cut does not match the display on other displays. Further, if the operating device 103 or 104 experiences a partial power outage, there is a drawback that the display of the light emitting element 106 of the operating device and the display of the display device 101 will not match.

<Object of the Invention> This invention provides that even if equipment other than the reference signal generator 107 experiences a partial power outage, the reference signal generator 10 automatically restarts when the power is restored to the equipment that suffered the power outage.
The purpose of this invention is to provide a two-wire transmission type display device which is capable of transmitting operation status information from 7, thereby automatically returning equipment that has suffered a power outage to its original state.

<Summary of the Invention> In the present invention, each device is provided with a power restoration detection means, and by outputting a power restoration detection signal from the power restoration detection means, it resets its own state, and at the same time sets a transfer request flag. Reference signal generator 1 sets the transfer request flag at a predetermined address.
07, thereby the reference signal generator 107
The device is configured to put the device into an information transmitting state and transfer all the operation information stored in the memory.

<Embodiments of the invention> FIG. 3 is a block diagram for explaining the structure of the reference signal generator 107 used in the two-wire transmission type display according to the present invention, and FIG. 4 is a block diagram for explaining the structure of the reference signal generator 107 used in the two-wire transmission type display according to the present invention. A block diagram for explaining the structure of the operating device 103 or 104 used, FIG. 5 shows the display device 1.
FIG. 2 is a block diagram for explaining the structure of 01.

Microcomputer 301, 40 for each device
1,501 and receiving circuits 302, 402, 502
and output circuits 303, 403, and 503. In addition, each device 107, 103, 104,
The input terminals of the receiving circuits 302, 402, 502 of 101 are connected to the two-wire transmission line 108, and the output terminals of the output circuits 303, 403, 503 are connected to the two-wire transmission line 1 through diodes 304, 404, 504.
The structure connected to 08 is also exactly the same.

(Reference signal generator) The microcomputer 301 of the reference signal generator 107 has a blank signal transmission command switch 305.
, a memory content transmission command switch 306, and a test signal transmission command switch 307 are connected, and these switches 305 to 307 have a structure in which a blank signal (a signal for leaving the office), a memory content, and a test signal can be arbitrarily transmitted. There is. 308
indicates a constant voltage power source obtained by rectifying commercial power source. Also, 309 indicates a battery for backup,
The switch 311 is turned on during a power outage and is configured to hold information in the memory built into the microcomputer 301.

When the operation signal is output from the operation device 107, this reference signal generator 107 compares the operation signal with the contents of the memory, and if the operation signal and the contents of the memory match, leave the contents of the memory as is, When the operation signal and the memory contents do not match, the sent operation signal is written into the memory. Therefore, the reference signal generator 107 always outputs clock pulses _P1 to _P64.
Only sending. The contents of the memory are transferred from the reference signal generator 107 when the switch 306 is turned on, or when the display 101 (described later)
Or when a transfer request is issued from the controllers 103 and 104.

(Operator) The operator 103 or 104 is connected to a microcomputer 401, a decoder 405, an amplifier group 406, an amplifier 407, a monitor matrix circuit 408, and an operation unit matrix circuit 409.

That is, the decoder 405 is given, for example, a parallel 4-bit upper address signal from the microcomputer 401. This upper address signal is converted into a scanning signal for, for example, 16 matrix lines in a decoder 405, and this scanning signal is amplified by an amplifier group 406 to be sent to a matrix circuit 408.
and 409 to matrix line groups 411 and 412.

As shown in FIG. 6, the operation unit matrix circuit 409 has operation switches 601 connected to each intersection of matrix lines 412 and 413, and when any one of the operation switches 601 is operated, that operation switch is connected. A signal is output to any one line of the matrix line group 413, and the microcomputer 401 takes in this signal as the address of the operated switch. microcomputer 4
The data taken in by 01 is output from output terminals F to G, and is transmitted through the amplifier group 407 to the matrix line group 414 of the monitor matrix circuit 408.
given to. Monitor matrix circuit 408
As shown in FIG. 7, a light emitting element 701 is connected to each intersection of matrix line groups 411 and 414. For example, L logic is applied to one of matrix line groups 414, whereas matrix line group 4
By applying H logic to any one of 11, the light emitting element 701 on the intersection thereof emits light or is turned off from the light emitting state. The position of this light emitting element 701 corresponds to the position of the operating switch 601, so that the signal output from the matrix line group 413 and the signal applied to the matrix line group 414 are the same.

In this way, when any one of the operation switches 601 is operated, the light emitting element 701 corresponding to that operation switch 601 is turned on or off. That is, each time the operation switch 601 is operated, the digital signal output from the matrix line group 413 is stored in the memory of the microcomputer 401.
At this time, a different address is specified for each operation switch, and the logic of the operation information stored in each address is reversed from the previously stored logic, and this signal with completely different polarity is used to indicate when the user is coming to work. I am trying to remember this as information about leaving the company.

A signal read out from the information stored in the memory is output to the output terminals F to G. Therefore, the polarity of the signal applied to the matrix line group 414 is reversed when the worker comes to work and leaves the office, so that the light emitting element 701 is lit when the worker comes to work, but when he leaves the office, the light emitting element is not lit. Therefore, each time the operating switch 601 is pressed, the microcomputer 401 operates to switch the operating switch between the going-to-work state and the leaving-off state.

The information stored in the memory of the microcomputer 401 has an address determined by clock pulses P ₁ to _{P 64} flowing through the two-wire transmission line 108, and its own address (which may be considered to be the same as the memory address). When they match, the data on the transmission line 108 and the data in the memory are compared, and when the comparison result is a mismatch, the information stored in the memory is output to the transmission line 108, and the reference signal generator 107 and the display 101. Note that the structure described above is that of the common operating device 104, but the individual room operating device 103 has one in the matrix circuit.
It has a structure in which several switches are connected, and the other structure is the same as the structure shown in FIG.

(Display Device) The display device 101 takes in the operation signals sent through the two-wire transmission line 108 into the memory in the order of each address. When loading into the memory, the contents of the memory are compared with the sent operation signal, and when they do not match, a comparison operation is performed in which the sent operation signal is loaded into the memory.

Reference numeral 506 indicates a latch circuit provided outside the microcomputer 501. This latch circuit 506
The operation signal taken into the microcomputer 501 is latched, and the latch output is sent to the amplifier group 50.
7, the output of the amplifier group 507 selectively turns on and off the lamp 508, and the display window 10
2 is controlled to be in a lighting and non-lighting state. 509 indicates an address decoder. This address decoder 509 performs the same operation as the decoder 405 described in FIG.
Memory elements 506a, 506b,...506 within
A scanning signal for sequentially selecting n is output. Further, addresses within each memory element 506a, 506b, . . . 506n are specified by signals output from output terminals A to B. Output terminal F is a latch circuit 506
This is a control signal output terminal that gives write and read commands to.

As explained above, each device has a microcomputer 301, 401, 501 with built-in memory.
will be provided. When all devices experience a power outage, the memory of the reference signal generator 107 is backed up by the battery 309, so the state before the power outage is maintained in this memory, and when the power outage is restored, the contents of this memory are transferred to each controller 103. , 104 and display 101
It is possible to restore the state to a state in which all the states match.

However, the operating device 103 or 104 or the display device 1
If 01 encounters a power outage or power outage alone, the memory contents of the device that experienced the power outage will no longer match the memory contents of other devices after power is restored.

Therefore, in this invention, the operating device 103 or 104
and power restoration detection means 415, 511 for detecting that power has been restored to each of the display device 101 after a power outage.
When power restoration is detected by the power restoration detection means 415 and 511, the operating devices 103 and 104 and the microcomputers 401 and 501 of the display 101 are reset to their initial states. When the microcomputers 401 and 501 are reset to the initial state, they output an operation signal transfer request flag to the reference signal generator 107. This transfer request flag is transmitted from the display 101 and the operating devices 103 and 104 using one of the addresses determined by the clock pulses P ₁ to _{P 64} output from the reference signal generator 107, for example. This address can be selected as the first address, for example. The operation of transmitting the operation signal transfer request flag is performed by the microcomputer 401,
It is executed by the program in 501.

When the reference signal generator 107 detects a transfer request flag at a certain specified address, that is, the start address, it enters a data transfer mode and transfers the operation signals stored in the memory all at once. As a result of this transfer, the device that has experienced a power outage has already had all of its memory contents reset, and has, for example, left the office, so it compares the incoming operation signals with the contents in its memory, and if the comparison results do not match, , rewrites the contents of the memory with the received operation signal. Therefore, when the transfer from the first address to the last address is completed, the contents of the memory of the device that experienced the power outage will be the same as the contents of the memory of the reference signal generator 107.

<Effects of the Invention> As explained above, according to the present invention, even if any one of the display device 101 or the operating devices 103 and 104 experiences a power outage or power outage, the power outage state can be restored. Then, a data transfer request is output to the reference signal generator 107, and the reference signal generator 107
Since the operation signals are transferred all at once from
The same contents as in the memory are written. Therefore, it is possible to match the status of other devices and provide a highly reliable two-wire transmission type display.

Although a lamp display type display device 101 has been described above, it is also possible to use a display device in which the display state is changed by reversing the front and back sides of the display board using, for example, an electromagnetic actuator.

[Brief explanation of drawings]

FIG. 1 is a block diagram for explaining a conventional two-wire transmission type display device, FIG. 2 is a waveform diagram for explaining its operation, and FIG. 3 is a structure of a reference signal generator used in the device according to the present invention. 4 is a block diagram for explaining the structure of the operating device used in the device of this invention. FIG. 5 is a block diagram for explaining the structure of the display device used for the device of this invention. 6 and 7 are connection diagrams of the operating section and the monitor section. 101: Display device, 102: Display window, 103,1
04: Operating device, 107: Reference signal generator, 10
8: Two-wire transmission line, 301, 401, 501: Microcomputer, 302, 402, 502:
Receiving circuit, 303, 403, 503: output circuit,
415, 511: Power restoration detection means.

Claims (1)

[Scope of Claims] 1. A display having a plurality of display windows and a memory for storing information to be displayed on the display windows; B. An operating device for transmitting information to be displayed in the memory of the display; C A reference signal generator that has a memory that stores information output from this operating device and a backup battery that backs up this memory in the event of a power outage, and normally outputs a clock pulse that operates the display and operating device in synchronization. A two-wire transmission type display device comprising: (D) a transfer request generating means provided on the display device and the operating device and configured to send a transfer request to the reference signal generator when power is restored after a power outage.