JPH0652913B2 - Two-wire display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial field of application" The present invention relates to a two-wire display device that can be used, for example, for employees of companies, government offices, etc. to display their departure from work, to leave work, or to display inventory of products.

“Prior Art” The present applicant has proposed a two-wire display device disclosed in “Japanese Patent Publication No. 63-31785”. This application relates to an improvement of the previously proposed two-wire type display device. An outline of the previously proposed two-wire type display device will be described with reference to FIG.

In FIG. 2, 10 is an input device, 20 is a display, 30 is a two-wire type signal transmission line, and 40 is a clock oscillator for applying a clock pulse to the two-wire type transmission line 30.

The input device 10 and the display device 20 are provided with switching devices 11 and 21,
The switching devices 11 and 21 are configured to switch in synchronization with the clock sent from the clock oscillator 40, and the switching devices 11 and 21 associate the input elements 12a to 12n and the display elements 22a to 22n with each other. Selected from the display elements 22a to 12n.
22n is configured to be displayed.

In this way, the input device 10 and the display device 20 are switched to the switching devices 11 and 2.
By providing 1, the input device 10 and the display 20 can be connected by the two-wire signal transmission line 30.

The clock signal output from the clock oscillator 40 is supplied to the two-wire signal line 30. Input device 10 and display 20
Is provided with clock detectors 13 and 23, and the switchers 11 and 21 are configured to step in synchronization with each other by a clock signal detected by the clock detectors 13 and 23.

In the example shown in the figure, the switching devices 11 and 21 are constituted by mechanical contact switches, but in reality they are constituted by semiconductor circuits. Furthermore, the input elements 12a-12n and the display elements 22a-22n are configured to be selected by a matrix circuit.

Clock pulses P _{1 to} P ₆₄ are sequentially output from the clock oscillator 40 as shown in FIG. 3, for example.

The illustrated example shows a case where the display device 20 is provided with 64 display elements. Therefore, 64 clock pulses are set as one cycle, and two blank times T ₀ are provided after the 64th pulse. The blanking time T ₀ causes the input device 10 and the display 20 to generate a synchronizing signal, and the synchronizing signal resets the switches 11 and 21 to the initial addresses. By this reset, the switches 11 and 21 are sequentially synchronized with each other while sequentially selecting the input element and the display element at the same address. The stepping speed is selected such that, for example, the stepping speed is incremented at an interval of 8.79 ms for each most ground and one cycle is completed in 589 ms.

As shown in FIG. 4, the display 20 has display elements 22a to 22a.
There are windows 24 corresponding to the number of n, and the display elements 22a to 22n are attached to the windows 24.

By the way, in this example, the display elements 22a to 22n show the case where the display elements of the type in which the shutter plate is moved are used. In this type of display element, the time required for opening and closing the shutter plate is about 150 to 180 milliseconds.

Therefore, as described with reference to FIG. 3, if the switches 11 and 21 are switched at intervals of 8.79 milliseconds, the shutter plate type display element cannot be operated.

Therefore, the clock generator 40 includes a circuit 41 that detects that a display switching signal has been generated from the input device 10, and a gate that controls the sending of the clock signal for a fixed period of time when the detection circuit 41 detects the display switching signal. Means 42 and
In the input device 10, when any one of the input elements 12a to 12n is operated, the clock signal transmission is interrupted for a certain period of time at the operated position of the input element. 4
3 is a pulse source, and 44 is a frequency divider.

This interruption time is the time required for the conversion operation of the display elements 22a to 22n, and is selected to be, for example, about 190 milliseconds. Although the clock transmission is restarted when the time of 190 milliseconds has elapsed, even if the input element is still operated in the next cycle, the clock is not interrupted at the address corresponding to the input element. .

In this way, the switching devices 11 and 21 are constantly switched and scanned at a high speed so that the change of the states of the input elements 12a to 12n can be detected, and the clock transmission is interrupted only when the states of the input elements 12a to 12n change. However, the display elements 22a to 22n are operated according to the interruption time.

On the other hand, the display device 20 has a switch element 24 which is controlled to be turned on by detecting the clock signal.
To provide. An alternating current switch element called, for example, a triac can be used as the switch element 24. A light source 25 and a commercial power supply 26 are connected in series with the alternating switch element so that the light source 25 is turned on only while a clock signal is present. I am configuring.

That is, since a commercial power outlet is generally prepared in each room, commercial power is drawn from the commercial power outlet to the display device 20, and the light source 25 is turned on by using the commercial power. When the clock signal is no longer detected for approximately 500 milliseconds or more, the ignition control voltage supplied to the switch element 24 becomes zero, the switch element 24 is no longer ignited, and is automatically turned back off. With this configuration, it is not necessary to supply electric power for lighting the light source from the input device 10 to the display device 20, and the cable connecting the input device 10 and the display device 20 is a two-wire type instead of a multi-core cable. The advantage that the signal line 30 can be obtained is obtained.

Even if many indicators are connected to the two-wire type signal line 30, the drive current of the display elements 22a to 22n is small, and the advantage that the two-wire type signal line 30 is not mainly used as a power supply path is obtained. .

[Problems to be Solved by the Invention] The two-wire type display device previously proposed is the input device 10 and the display device 2.
0 and the clock generator 40 are connected to each other via a two-wire signal line 3
It is excellent in that it can be connected with 0.

However, since the input device 10 is a device that is installed on the desk of each staff member, it is troublesome in that it needs to be wired even though it is a two-wire signal line. There is also the drawback that construction costs will also be incurred.

"Means for Solving the Problem" In the present invention, the input device of the two-wire type display device is configured to be remotely operable by a telephone.

Therefore, a telephone connected to the exchange is provided for inputting the two-wire type display device, and a call detection signal input to the telephone is detected and a call detection signal is transmitted between the telephone and the two-wire type display device. Call detection means, automatic incoming call switching means for switching the telephone to an incoming state by the call detection signal, and judge whether the data input to the telephone is good or bad. If good, at the first output end, if bad, Is given a data pass / fail determination means for outputting a determination signal to each of the second output ends, the call detection signal, the pass / fail determination signal from the first output end, and the defect determination signal from the second output end. A low-frequency oscillator that outputs different signals to the transmitter circuit of the telephone for a predetermined time according to these two signals, and an automatic disconnecting means that returns the telephone to an idle state after a predetermined time when a defect determination signal is output from the second output end. And the electric A number decoding means for decoding correctly input data from the machine, the arrangement comprising a control means for controlling the corresponding input elements of the input device by the decryption output is provided.

According to this invention, the caller can send the data by dialing after confirming the state that the telephone is connected to the input side of the two-wire display device, and the data can be sent only when the sent data is correct. Only the number is decoded by the number decoding means, and the decoding result is given to the controller, and the controller selects the input element of the input device corresponding to the correctly input data, and makes the correct display to operate on. You can

According to the configuration of the present invention, for example, each staff member can input his or her departure from the office or leaving the office to the two-wire type display device by using the nearest telephone.

As a result, it is not necessary to install the input device on the desk or room of each staff member, and thus there is an advantage that the construction can be completed easily.

[Embodiment] FIG. 1 shows an embodiment of the present invention. In this example, a case is shown in which one private telephone 300 is called from the local telephone group 200.

In the figure, 100 is an extension exchange on the premises, and 200 is this exchange 1.
00 is a private telephone group, 300 is an incoming call-only telephone, 400 is an additional device, and 500 is the two-wire type display device described above.

The incoming call-only telephone 300 is called from the local telephone group 200 and is used as a receiver of a dial signal for controlling the two-wire display device 500. That is, this example shows a case where a so-called push dial type telephone of the frequency dial system is used as the premises telephone group 200. Therefore, when the dial button is pressed during a call, the signal of the frequency assigned to the pressed dial button is sent to the incoming call-dedicated telephone 300.

The additional device 400 is connected between the incoming call-only telephone 300 and the input device 10 of the two-wire display device 500.

When the additional device 400 is provided with the call detection means 401, the automatic incoming call switching means 402, and the call detection signal and the input data defect determination signal, it outputs a different signal to the transmission circuit of the telephone for a predetermined time according to the signal. Frequency oscillator 403
Data pass / fail judgment means 404 and automatic disconnection means 405
, A timer 406, a number decoding means 407, and a controller 408 which controls conversion of an input element of the input device 10 according to the decoding result of the number decoding means 407.

The call detection means 401 is connected to the telephone line side of the incoming call-dedicated telephone 300, and detects a call signal when the call is made from any of the premises telephone groups 200. Since the ringing signal is an intermittent signal, the number of times of intermittence is counted, and at the time of intermittently about 2 to 3 times, for example, a call detection signal is sent to the automatic incoming call switching unit 402 to switch the automatic incoming call switching unit 402 to the incoming side.

The automatic incoming call switching unit 402 can be configured by, for example, a plurality of relays, and at least one of the plurality of relays can be used.
One is connected in parallel with the hook switch of the telephone 300, and when the call detection signal switches this relay to the on state, the hook switch is substantially turned on and the telephone 300 is switched to the incoming state.

The ringing detection signal output from the ringing detecting means 401 is also given to the low frequency oscillator 403 which constitutes an incoming call display to activate the low frequency oscillator 403.

Oscillation output signal of low-frequency oscillator 403 (for example, 1 to 2 kHz
Signal) is output to the transmitting circuit and transmitted to the calling telephone. When the low-frequency oscillator 403 signal is transmitted to the calling telephone, the caller can know from the sound that his or her telephone is connected to the incoming call-dedicated telephone 300.

The oscillating sound is sent for about 3 to 5 seconds and automatically stopped by the timer 406.

When the oscillating sound stops, the caller first selects whether to output a signal indicating departure or a signal indicating departure. For example, in this example, it is assumed that when the dial button "1" is pressed, the office signal is output, and when the dial button "0" is pressed, the office leaving signal is output.

Therefore, when you are going to the office or leaving the office, "1" to "0"
After pressing the dial button of, the number assigned to each staff member is operated.

Data quality determination means 4 provided in the interface 400
In 04, if the head of the data sent from the sender is "1" or "0", and the number sent next is within the range of the numbers assigned to all staff, the data is detected as good. Then, a good data signal is output to the output terminal 404A.

On the other hand, when the head of the data sent from the sender is other than "1" or "0", and even if the head is "1" or "0", the subsequent numbers are within the range of numbers assigned to all staff. If it is not, a data defect signal is output to the output terminal 404B.

When the good data signal is output to the output terminal 404A, the good data signal is transmitted to the low frequency oscillator 403 which constitutes an incoming call display.
Is input to the input terminal 403A of the low frequency oscillator 403 to activate the low frequency oscillator 403. As a result, the originator is informed that the oscillation signal of the low frequency oscillator 403 has been transmitted and that the data has been correctly input.

On the other hand, a data defect signal is output to the output terminal 404B, and this data defect signal is input to the input terminal 40 of the oscillator 403.
3B, the oscillator 403 intermittently oscillates and transmits the intermittent signal to the caller. The caller knows that the input data is defective by listening to the intermittent signal.

Therefore, in such a case, the circuit is once disconnected and the incoming call-dedicated telephone 300 is called again to start over.

When a data defect detection signal is output from the output terminal 404B of the data quality determining unit 404, this data is automatically input to the automatic disconnecting unit 405 and the timer 406 is activated, and the data is automatically detected after a predetermined time, for example, 10 seconds. Specifically, the incoming call-only telephone 300 is disconnected from the exchange 100. Further, while the data is being input, the disconnection operation is automatically performed even when the interval between pressing the dial buttons is 10 seconds or more.

When the data is correctly input, the number decoding means 407 decodes the input number and gives the decoding result to the controller 408. The controller 408 selects an input element of the input device 10 corresponding to the input number and turns it on.

Although the input device 10 has been schematically described with reference to FIG. 2, it is specifically composed of two matrix circuits MA and MB as shown in FIG. One matrix circuit MA constitutes an office display input device, and the other matrix circuit MB constitutes an office display input device.

Either the matrix circuit MA or MB is selected according to the number at the beginning of the input data, and the switch of the assigned number in the matrix circuit MA or MB is turned on by the subsequent 2-3 digit numerical value. A departure display signal or a departure display signal is transmitted.

Although an example in which one incoming call-only telephone 300 is provided has been described above, this number is arbitrarily selected, and the interface 400 is provided for each incoming call-only telephone.

The telephone set 200 may be an external telephone network instead of an internal telephone network.

The same operation can be performed by using a dial pulse type telephone as the telephone.

Further, by using the transfer telephone, the display of the two-wire type display device installed in the distant building can be configured so that both of them can be changed at once by one dial operation.

[Advantages of the Invention] As described above, according to the present invention, since the input of the two-wire type display device can be performed using the telephone, it is not necessary to provide an input device for each staff member. Therefore, the wiring work can be simplified, the cost can be reduced, and the cost can be reduced.

Further, according to the present invention, only the data correctly input from the telephone is decoded by the number decoding means, and the decoding result is given to the controller so that the controller can input the input element of the input device corresponding to the correctly input data. There is a feature that a correct display can be performed because the user selects and operates on.

[Brief description of drawings]

FIG. 1 is a block diagram for explaining an embodiment of the present invention, FIG. 2 is a connection diagram for explaining an outline of a two-wire type display device, and FIG. 3 is for explaining the operation of FIG. Waveform diagram of
FIG. 4 is a perspective view for explaining the external structure of the display used in the two-wire type display device shown in FIG. 500: Two-wire type display device, 10: Input device, 20: Display device, 40: Clock generator, 100: Private branch exchange, 20
0: On-premises telephone group, 300: Telephone for incoming call only, 400:
interface.

Claims (1)

[Claims] 1. An input device in which an input element composed of a switch is selected in synchronization with a clock output from a clock generator, and a display window corresponding to an input element in the input device is selected in synchronization with the clock. An indicator, a call detection means for detecting a call signal input to a telephone connected to the exchange and transmitting a call detection signal, an automatic incoming call switching means for switching the telephone to an incoming call state by the call detection signal, Data pass / fail determining means for determining whether the data input to the telephone is good or bad, and outputting a determination signal to the first output end if the data is good, and to the second output end if the data is bad, and the call detection When a signal and a good judgment signal from the first output end and a defect judgment signal from the second output end are given, a different signal depending on both of these signals is transmitted for a predetermined time period by the telephone. A low-frequency oscillator for outputting to the telephone, automatic disconnecting means for returning the telephone to an idle state after a predetermined time when a defect determination signal is output from the second output terminal, and decoding data correctly input from the telephone. A two-wire type display device comprising: a number decoding means; and a controller for controlling the corresponding input element of the input device by the decoding output.