JPH10222770A - Common-line multiplex transmission display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To change the display colors of a display unit through single operation. SOLUTION: A control machine and terminals 3a... having bicolor LED display units 2 by two common lines L1 and L2; and the control machine sends out a transmit signal of address data and display data for performing display operation on the display units of the terminals cyclically in order to the terminals 3a... through the common lines L1 and L2, and the terminals 3a... perform the display operation by their bicolor LED display units when address data sent out through the common lines L1 and L2 match their previously set address data d1, and send out return signals D11 of address data d11 and confirmation data d13 for confirmation of the reception of the display data sent out successively to the control machine.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a common line multiplex transmission display device, and more particularly to a common line multiplex transmission display device capable of changing the color display of a display with a single operation.

[0002]

2. Description of the Related Art Hitherto, an exit display device as shown in FIG. 9 has been proposed. In this display device, the controller 21 is connected to the common lines L1 and L2 together with the display panel 42. Modular jack 48 for common lines L1 and L2
The personal operating devices 43, 43 are connected via the intermediary of the central operating device power supply box 44 and the relay amplifier 46. A central controller 45 is connected to the common lines L1 and L2 via a modular jack 48 downstream of the central power supply box 44, and a display 47 is connected via a modular jack 48 downstream of the relay amplifier 46. I have. The pushbutton operating switch 24a is provided on the personal operating device 43.
(24b, 24c), an LED display 34 is provided.

FIG. 7 shows a simplified block diagram of this access display device. The controller 21 comprises two common lines L1, L2.
Terminals 23a, 23b, 23 which are personal operating devices
Connected to c. Push button operation switches 24a, 24b, 24c are connected to the terminals 23a, 23b, 23c, respectively. In FIG. 8, the controller 21 includes a transmission driver 27, a signal processing unit (CPU) 28, and a differential amplifier 2.
9. It comprises a current detection resistor 30.

Each of the terminals 23a, 23b and 23c includes a rectifying bridge 31, a return driver 32, a signal processing section 33, a transistor Tr, an LED display 34 and a constant voltage diode 3.
Consists of five. In such an entry / exit display device, the controller 21 includes the preset terminal devices 23a, 23b,
Address data of 23c (address 1, address 2, ...)
And the display data indicating the display state of each terminal device (controlled device) are sequentially transmitted to the two common lines L1 and L2 (FIGS. 11 and 13).

In FIG. 8, the address and the display data are sent from the signal processing unit 28, and are made into high voltage data of ± 24V (48V) by the transmission driver 27 (see FIG. 1).
2) It is sent to two common lines L1 and L2. When the transmitted high-voltage data reaches the terminals 23a, 23b, and 23c, the rectification bridge 31 rectifies the high-voltage data to a DC voltage of about 24 V, which is used as a power supply source for the terminals 23a, 23b, and 23c. From the common lines L1 and L2, the 5VPP data, which has been lowered / constantized by the constant voltage diode 35, is generated and input to the signal processing unit 33 as a reception signal. The signal processing unit 33 is the terminal device 23 that has been given in advance.
After comparing the addresses of a, 23b, and 23c with the address of the received signal, the next display data is accepted only when they match.

In this case, if the addresses match, the signal processing section 33 turns on / off the LED 34 as a display via the transistor Tr. That is, the signal processing unit 33 turns on the transistor Tr to turn on / off the LED 34.
By turning on / off, the LED 34 is turned on / off by a 24 V DC power supply. The signal processing unit 33 notifies the controller 21 that the data has been reliably received.
The return signal is subjected to voltage-current conversion by the return driver 32 and returned to the controller 21 as a current signal through the two common lines L1 and L2. The return signal is current-voltage converted by the current detection resistor 30, amplified by the differential amplifier 29, and sent to the signal processing unit 28 as return signal data. The signal processor 28 completes a series of operations by recognizing the return signal. The signal processing unit 28 repeats these operations.

In this display device, if the controller 21 sends the address and the display data to the terminal, a reply signal is returned from the terminal having the same address. Address 1 → Address 2 → Address 3… →
As in address 1, all terminals are accessed cyclically. At this time, the next display data is transmitted after a reply signal corresponding to the previous display data is returned.

In such a departure / receipt display device, bidirectional transmission is possible, but during the polling operation, the next display data must wait until a reply signal corresponding to the previous display data is returned. That is, so-called half-duplex transmission in which data transmission and reception are alternated takes time and the polling cycle becomes longer.

[0009]

On the other hand, in this entry / exit display device, the LED indicator 34 of the personal operator 43 is now used.
Is in the "OFF" state in FIG. 10A, the operation switch 24 is displayed to indicate that the operator is on a business trip.
When a is pressed once, a color display signal indicating that the operation switch 24a for "business trip" is pressed by the personal operator 43 is transmitted from the modular jack 48 to the controller 21 via the common lines L1 and L2. It Controller 21 is display panel 4
2. Recognizing the respective color display states of the personal operation device 43, the central operation device 45, and the display device 47, the personal operation device 4
When the color display signal is received from the display panel 3, the "orange" color display signal is transmitted through the common lines L1 and L2 to the display panel 42, the personal operator 43, the centralized operator 45, and the display according to the pattern of FIG. To each of 47. The transmitted color display signal is sent from the display panel 42, the modular jack 48 to the personal controller 43, and the power box 4 for the central controller, respectively.
4, modular jack 4 via relay amplifier 46
8 is input to the centralized operation device 45 and the display device 47, and the display of the LED display 34 of the personal operation device 43 is changed to "orange" in accordance with the color display signal. Similarly, the display of the LED display device of the display panel 42, the centralized operation device 45, and the display device 47 corresponding to the operator is changed to "orange". In this way, the status of the operator's withdrawal can be confirmed at a distant place by discriminating the colors on the display panel 42, the centralized operation device 45, and the display device 47.

[0010] The personal operation device 4 in the access display device
In FIG. 3, when the operator wants to change the color to “green” for the “present” display, the operator must depress the operation switch 24a of the personal controller 43 three times according to the pattern of FIG. 10B. However, pressing once causes a series of color display signal transmission operations to be repeated three times. Therefore,
The time for occupying the common lines L1 and L2 becomes long, and the operation takes a long time. In addition, the operator is not accustomed to the pattern shown in FIG. 10B, and if the operator makes a mistake once, there is a drawback that the operator needs to press the button three times or more.

The present invention has been made to solve such a problem, and an object of the present invention is to provide a common line multiplex transmission display device capable of changing the color display of a display device by a single operation.

[0012]

In order to achieve this object, a common line multiplex transmission display device according to the present invention comprises a controller,
A plurality of terminals having a color LED display are connected by a two-line common line, and the controller displays the address data to the terminal via the common line and subsequently the two-color LED display of the terminal. The terminal transmits cyclically a transmission signal with display data to be operated, and when the address data transmitted via the common line coincides with its own preset address data, the terminal has a two-color LED display. In addition to the display operation, the control signal is sent to the controller with a reply signal of its own address data and subsequently confirmation data for confirming the reception of the sent display data.

The controller has a modulation circuit for modulating a carrier with a transmission signal, and a power / data transmission circuit for transmitting the modulated carrier signal to each terminal as a high-voltage signal,
Each terminal is provided with four operation switches arranged in parallel to be pressed in response to leaving the office, being present, a meeting, a business trip, etc., and a power supply for receiving a high-voltage modulated carrier signal transmitted from the controller. To demodulate the high-voltage modulated carrier signal received by the data transmission / reception unit and the power / data transmission / reception unit, and perform color display operation corresponding to leaving, attending, meeting, business trip, etc. on the terminal's two-color LED display. And a current sending circuit that transmits a current signal to the controller together with a return signal as display data when one of the operation switches is pressed at each terminal. And a current-to-voltage conversion circuit for performing current-to-voltage conversion of the received current signal as a return signal.

In this common line multiplex transmission display device, a transmission signal of the address data from the controller to the terminal via the common line and subsequently the display data for performing the display operation on the display of the terminal are sequentially transmitted. It is sent out cyclically. When the address data sent out via the common line coincides with its own preset address data, the terminal performs a display operation on the display of the terminal, and at the same time sends its own address data and the Subsequently, a reply signal is transmitted with confirmation data confirming reception of the transmitted display data. In this case, the controller modulates the carrier wave with the transmission signal by the modulation circuit and sends the modulated carrier wave signal from the power supply / data sending circuit to each terminal as a high voltage signal. Each terminal receives the high-voltage modulated carrier signal sent from the controller at the power supply / data transmission / reception unit, demodulates it at the demodulation circuit, and performs the display operation on the terminal display.

When one of the four operation switches arranged side by side in accordance with leaving, attending, meeting, business trip, etc. from each terminal is pressed, a return signal is displayed as display data together with a return signal as a current signal to the controller by a current sending circuit. Then, the controller performs current-voltage conversion of the current signal as a return signal sent from each terminal by the current-voltage conversion circuit. In response, the controller modulates the carrier with the transmission signal by the modulation circuit,
The modulated carrier signal is sent from each data sending circuit to each terminal as a high voltage signal. Each terminal supplies a high-voltage modulated carrier signal sent from the controller
It is received by the data transmission / reception section, demodulated by the demodulation circuit, and displayed on the display of the terminal. In this way, the common line multiplex transmission display device of the present invention can change the color display of the display unit by one operation of the four operation switches.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION A common line multiplex transmission display device of the present invention will be described in detail below with reference to the drawings showing preferred embodiments thereof. As shown in FIG. 1, the common line multiplex transmission display device of the present invention connects a controller 1 and a plurality of terminals 3a, 3b, 3c as controlled devices by two common lines L1, L2. Become.

As shown in FIGS. 2 and 3, the controller 1 sends the address data d11, d21, ... To the terminals 3a, 3b and 3c via the two common lines L1 and L2, and subsequently to them. The transmission signals D1, D2,... Comprising display data (color data) d12, d22,... For performing a display operation on the two-color LED display 2 of the terminals 3a, 3b, 3c are sequentially transmitted cyclically (FIG. 13).

The terminals 3a, 3b, 3c of the terminals 3a, 3b, 3c, when the address data d11, d21, ... sent out via the common lines L1, L2 coincide with their own preset address data d1. The display operation is performed by the two-color LED display 2, and the address data d11 of the control device 1 itself, followed by confirmation data (color data) d13 confirming the reception of the transmitted display data. Has the function of transmitting the reply signal D11 of The two-color LED display 2 comprises a green LED 1 and a red LED 2 and is displayed from one window.

The controller 1 comprises a central processing unit 10, address data d11, d21, ... Controlled by the central processing unit 10 and display data (color data) d12, d22 ,. A differential PSK (Phase Shift Keying) modulation circuit 8 for modulating a carrier with transmission signals D1, D2,... And a power / data transmission for transmitting the modulated carrier signal as a high-voltage signal to each terminal 3a, 3b, 3c. And a circuit 9. The differential PSK modulation circuit 8 compares the phase of the previous bit and the current bit, and determines whether the phase is equal or different, and determines whether the phase is 0 or 1, as in the PSK modulation circuit. It is not necessary to give a reference phase. In addition, the differential PSK modulation circuit 8
Can be configured by an FSK (Frequency Shift Keying) modulation circuit.

Further, the controller 1 includes the terminals 3a, 3b, 3c.
A current-voltage conversion circuit 12 for performing current-voltage conversion of a current signal as a return signal D11 sent from the control unit 10, and a return signal D11 to the central processing unit 10 by removing high-frequency components from the output from the current-voltage conversion circuit 12. It has a low-pass filter (LPF) 11 for inputting as. Each terminal 3a, 3b, 3c
And four power switches SW1 to SW4, which are pressed in accordance with leaving, attending, attending a meeting, a business trip, etc., and a high-voltage modulated carrier signal transmitted from the controller 1, The data transmission / reception unit 4 receives and demodulates the data, and each terminal 3a, 3b, 3
A demodulation circuit 5 for performing a color display operation corresponding to leaving, attending, attending a meeting, a business trip, etc. on the two-color LED display 2 of c, and four operation switches SW1 to SW4 at each terminal 3a, 3b, 3c A current sending circuit 7 for transmitting a current signal to the controller 1 together with a reply signal D11 as display data when one is pressed.
A rectifier circuit 6 for rectifying the signal power extracted from the high-voltage carrier signal sent from the controller 1 and supplying the rectified signal power to each circuit unit, and a central processing unit 10a for controlling these.
And The operation switches SW1 to SW4 are connected to the rectifier circuit 6 in series with the resistors.

When the common line multiplex transmission display device of the present invention is applied to the access display device shown in FIG. 9, the controller 1 is connected to the common lines L1 and L2 together with the display panel 42 as shown in FIG. I have. Terminals 3a, 3b, and 3c personal controllers 43, 43 are connected to the common lines L1 and L2 through modular jacks 48.
4. The relay amplifier 46 is interposed. Also, the common line L1,
L2 is connected to a centralized controller 45 via a modular jack 48 at the subsequent stage of the power supply box 44 for centralized controller, and a display 47 via a modular jack 48 to the subsequent stage of the relay amplifier 46. Personal controller 4
3 is a push button operation switch 24a (24b, 24c),
An LED display 34 is provided.

As shown in FIG. 4, the personal operation device 43
It has operation buttons 13a, 13b, 13c, 13d for four operation switches SW1 to SW4 arranged in four directions which are pressed according to leaving, attending, meeting, business trip, etc. Central processing unit 1 by pressing switches SW1 to SW4
The display data signal corresponding to leaving the office, attendance, meeting, business trip, etc. is transmitted from 0a. The personal operation device 43 is also provided with a two-color LED display 2.

Note that, in this access display device, the color of the LED display 2 of the personal operation device 43 and the leaving, attending, meeting,
It is assumed that the business trip and the like are set as shown in FIG. In the thus constructed common line multiplex transmission display device, the controller 1 includes the address data d11, d21,... Of the terminals 3a, 3b, 3c set in advance under the control of the central processing unit 10, and the like. Each terminal 3a, 3b,
The carrier wave is modulated by the differential PSK modulation circuit 8 by the transmission signals D1, D2, ... With the display data d12, d22 ,.
The carrier signal modulated from is used as a voltage signal of a high voltage of ± 24V (48V). Two common lines Two common lines L1 and L2
Are sent cyclically.

The high-voltage voltage signal sent out is sent to each terminal 3
When it reaches the terminals a, 3b, 3c, for example, the terminal 3a, it is received via the power / data transmitter / receiver 4, rectified by the rectifier circuit 6 into a DC voltage of about 24V, and used as the power supply source for the terminal 3a, while demodulating The circuit 5 demodulates it into address data and display data. The demodulated address data is input to the central processing unit 10a, and after comparing with the address data d1 of the terminal 3a which has been previously given, it accepts the next display data only when they match. In this case, if the addresses match, the display operation is performed by turning on / off the two-color LED display 2 of the terminal 3a according to the display data.

In order to inform the controller 1 that the data has been reliably received, the central processing unit 10a confirms reception of its own address data d11 and subsequently the display data sent out (color data). A reply signal D11 with (data) d13 is sent as a current signal by the current sending circuit 7 and sent back from the rectifying circuit 6 and the power / data sending / receiving section 4 to the controller 1 via the two common lines L1 and L2.

In the controller 1, the current-voltage conversion circuit 1
2, the current signal as the reply signal D11 sent from each terminal 3a, 3b, 3c is current-voltage converted. The reply signal D11 converted into the current-voltage is the low-pass filter (L
PF) 11 to the central processing unit 10 as a reception signal D11. The central processing unit 10 completes a series of operations by recognizing the received signal. Central processing unit 1
0 repeats these operations.

When the address data d11 sent from the controller 1 matches its own address data d1,
When the two-color LED display 2 of the personal operation device 43 in the terminal 3a is in the state of "OFF" in FIG. 10A, the operator presses the operation button 13a to indicate that "business trip" is in progress. When the operation switch SW1 is activated (FIG. 9,
As shown in FIG. 4) and FIG. 6, the "orange" color display signal is transmitted.

The "orange" color display signal is transmitted to the controller 1 via the modular jack 48 and the common lines L1 and L2. The “orange” display signal is sent from the controller 1 to the personal controller 43, the central controller 45, and the display 47.
"Orange" color display signal is common line L1, L2, modular
It is transmitted to the personal controller 43 via the jack 48,
The green LED 1 and the red LED 2 of the two-color LED display 2 are simultaneously lit and displayed in “orange”, and the common lines L 1 and L 2, the power supply box 44 for the centralized controller, the modular jack 48
Via the common line L1, L
2. The power is transmitted to the display 47 via the power supply box 44 for the centralized controller and the relay amplifier 46, and the display corresponding to the operator is displayed in "orange".

In this case, when the operation switch SW1 operates,
The central processing unit 10a sends a return signal D11 of its own address data d11 and subsequently display data (color data) d13 as a current signal by the current sending circuit 7 in order to notify the controller 1 of this. , The rectifier circuit 6 and the power / data transmission / reception unit 4 return to the controller 1 via two common lines L1 and L2. In the controller 1, the current-voltage conversion circuit 12 performs current-voltage conversion of the current signal as the return signal D11 sent from the terminal 3a. The current-voltage converted return signal D11 is a low-pass filter (LP
F) 11 is input to the central processing unit 10 as a reception signal D11. The central processing unit 10 recognizes the received signal,
Perform display processing.

The transmission / reception control circuit 1a of the controller 1
From each of the terminals 3a, 3b, 3c to the address data and the display data for performing the display operation on the two-color LED display 2 of each of the terminals 3a, 3b, 3c, the voltage signals as D1 and D2, and the terminals. The current signal as the reply signal D11 sent from 3a, 3b and 3c is sent and received in synchronization.

That is, since the controller 1 performs full-duplex transmission, as shown in FIG. 5, in the polling operation, the timing at which the next display data is transmitted is the reply signal corresponding to the previous display data. It is possible to reply repeatedly. Therefore, it is possible to send and receive data even when the previous reply signal and the next display data overlap.
The polling cycle can be shortened, and the data processing speed can be increased.

Although the above embodiment has been described only with respect to the terminal 3a, the same applies to the other terminals 3b and 3c, and a description thereof will be omitted.

[0033]

As is apparent from the above description, according to the common line multiplex transmission display device of the present invention, it is possible to change the color display of the display unit with one operation. Further, this reduces the time for occupying the common lines L1 and L2, and the operation can be completed in a short time.

[Brief description of the drawings]

FIG. 1 is a block diagram of one embodiment of a common line multiplex transmission display device of the present invention.

FIG. 2 is a circuit configuration diagram of a controller using the common line multiplex transmission display device of the present invention.

FIG. 3 is a circuit configuration diagram of a terminal using the common line multiplex transmission display device of the present invention.

FIG. 4 is a configuration diagram of an operation device using the common line multiplex transmission display device of the present invention.

FIG. 5 is a data organization diagram used in the common line multiplex transmission display device of the present invention.

FIG. 6 is an operation explanatory view of the common line multiplex transmission display device of the present invention.

FIG. 7 is a block diagram of a conventional entry / exit display device.

FIG. 8 is a partial detailed circuit diagram of a conventional entry / exit display device.

FIG. 9 is a system configuration diagram of a conventional entry / exit display device.

FIG. 10 is an explanatory diagram of an operation of a display in a conventional exit display device.

FIG. 11 is a data organization diagram used in a conventional entry / exit display device.

FIG. 12 is a data configuration diagram used for a conventional entry / exit display device.

FIG. 13 is an explanatory diagram of transmission of data used in a conventional exit display device.

[Explanation of symbols]

 1 ... Controller 1a ... Transmission / reception control circuit 2 ... Two-color LED display 3a, 3b, 3c ... Plurality of terminals 4 ... Power supply / data transmission / reception unit 5 Demodulation circuit 7 Current transmission circuit 8 Modulation circuit 9 Power supply / data transmission circuit 12 ... Current-voltage conversion circuit L1, L2... Two common lines d11, d21... Address data d12, d22. ..Confirmation data that received display data d1... Preset address data D1 and D2........... ..... Four operation switches arranged in parallel

Continuation of front page (51) Int.Cl. ⁶ Identification code FI H04L 12/40 H04L 11/00 320

Claims (1)

[Claims] 1. A controller (1) and a two-color LED display (2)
Are connected by two common lines (L1, L2), and the controller sends the address data (d11, d2) to the terminals via the common lines.
, ...) and subsequently display data (d12, d22, ...) Performing a display operation on the display unit of the terminal are sequentially and cyclically transmitted, and the transmission signals (D1, D2, ...) The terminal performs a display operation on the two-color LED display of the terminal when the address data sent out via the common line coincides with the preset address data (d1) of the terminal, and On the other hand, in the common line multiplex transmission display device for transmitting a reply signal (D11) of the address data (d11) and subsequently confirmation data (d13) for confirming reception of the transmitted display data, The controller has a modulation circuit (8) for modulating a carrier with the transmission signal, and a power / data transmission circuit (9) for transmitting the modulated carrier signal to each terminal as a high-voltage signal, Each terminal Four operation switches (SW1 to SW4) arranged side by side, which are pressed according to leaving, attending, meeting, business trip, etc.
A power / data transmission / reception unit (4) for receiving a high-voltage modulated carrier signal sent from the controller, and demodulating the high-voltage modulated carrier signal received by the power / data transmission / reception unit. Leave the company with the two-color LED display of the terminal,
A demodulation circuit (5) for performing a color display operation corresponding to presence, a meeting, a business trip, etc .; And a current sending circuit (7) for sending as a current signal to the controller, the controller current-voltage converting circuit (12) for current-voltage converting the current signal as the reply signal sent from each terminal. And a common line multiplex transmission display device.