JPS5999595A - Information transmission system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an information transmission system used in fire alarm systems, smoke prevention systems, and the like.

FIG. 1 is a block diagram showing an information transmission system in a conventional automatic fire alarm system. In the same figure, when any one of the plurality of sensors S, S2... is activated, the relay
operates, and its output contacts operate bells, indicators, etc. However, when a certain alarm S1 operates, a signal having a natural frequency f1 is generated from the oscillator Il+, /, and this signal is transmitted to the transmission line by capacitor coupling.
At the same time, on the receiver side, the frequency @ component is also collected by Njinsa coupling, the frequency discrimination circuit (1) discriminates the signal of the natural frequency f1, and the address display circuit (2) detects the signal of the sensor S1. It is designed to display an address. However, in information transmission systems using such natural frequencies, it is difficult to change the natural frequencies, and it is necessary to prepare filters and filters for each of the many natural frequencies, resulting in poor productivity. Ta. Therefore, conventionally, as shown in Figure 2,
Each sensor S3. Pulse code transmission circuit Ill for which addresses are individually set for each S2...

l112... are connected respectively, and each sensor S1 + S2
The operation of the pulse code transmission circuit 11. ,
The voltage detection circuit (31) converts each pulse code signal generated from 112... into a change in DC voltage, and the code processing circuit (4'rVc) detects and discriminates the two Hals codes, and outputs the address display circuit. ) has proposed a small India address system that displays the addresses of the operating sensors S, , S2, etc. However, in such a small India address system, the information transmitted from the sensor to the receiver is For example, it is possible to distinguish between a preliminary alarm and a main alarm by changes in the voltage level or current level.
There is a problem that it is not possible to transmit smoke detection concentration, and there is a problem that information based on level changes and information based on pulse codes cannot be used together.

The present invention has been made to solve these problems of the conventional example, and transmits a level signal whose level changes in multiple stages from a disaster prevention sensor to a receiver to generate a preliminary warning and a main warning. To provide an information transmission system which enables the discrimination of smoke detection signals and the transmission of smoke detection background signals, and also enables the transmission of a self-diagnosis command from a receiver to a disaster prevention sensor via a signal transmission line. The purpose is to

The configuration of the present invention will be described below with reference to illustrated embodiments. 8th
The figure is a block diagram showing a disaster prevention monitoring system using an information transmission method according to an embodiment of the present invention. As shown in the figure, 2
The wire-type fire alarm line (7) has standard detectors such as general smoke detectors (8), and isiterisience equipped with a self-check function and linear information sending function such as an intelligence sensor (9). It is mixed with a disaster prevention sensor. It also has a control monitoring line f + ol (ri) 2-wire power supply line and a 2-wire No. 11 transmission line, and is a monitoring and control terminal for starting and controlling the smoke prevention system ER and fire alarm bell B. A control command CD is sent from the central supervisory control device (6) to each supervisory control terminal repeater (1), and conversely, a control command CD is sent to each supervisory control terminal repeater (1). The operation confirmation signal T is sent to the central monitoring and control unit (6).The intelligence sensor (6) is still sending the operation confirmation signal to the fire alarm line (7) from the central monitoring and control unit (6). 9) Self-check signal S for
C, that is, a self-diagnosis command is sent as a non-transmission signal such as a pulse code, and conversely, a detection level signal DL is sent from the fire alarm line (7) to the central monitoring and control device (6). It is. That is, the intelligence sensor (9) transmits a transmission signal V consisting of a pulse code (M number).
It has a self-check function and a three-level smoke concentration detection function. The self-check function is a function that puts the internal circuit in the same state as when smoke is detected by inputting the self-check signal SC. In addition, the 8-level smoke concentration detection function is a function that distinguishes and detects smoke swirls of 5, 10%, and 15%, and detects the detection level signal IJL, which changes level in stages according to each smoke humidity. It is designed to be transmitted as a voltage level signal. Figure 4 shows the fire alarm line (7
) shows an example of the signal waveform transmitted over
(As shown, a small pulse waveform 14 is applied to the voltage level signal.)
The voltage signal on which No. 8 is superimposed is transmitted on the fire alarm line (7). The central monitoring and control device (6) identifies the multi-step voltage level signals transmitted on the fire alarm line (7) and issues an alarm corresponding to each voltage level signal. There are two types of alarms: preliminary alarms and main alarms.
6) The fire warning light on the display (12j) lights up and a fire warning signal sound is emitted, but in this case, the fire alarm bell B in each area will ring and the smoke prevention system L will be activated. Of the 8 levels of smoke detection concentration mentioned above, which level corresponds to the preliminary grh report and the main alarm can be set on the operation panel (13), and the main Control monitoring line tlO at the time of alarm)
It is also possible to set control patterns such as which load is to be operated among the loads connected to the machine using the operation unit (131).

The present invention is configured as described above, and includes a disaster prevention sensor that sends out a level signal whose level changes in multiple stages according to changes in the sensing state, and a disaster prevention sensor that identifies the multi-stage level signals and responds to each level signal. A superimposed signal that is transmitted by superimposing a self-diagnosis command on the level signal to make the internal circuit of the disaster prevention sensor the same state as during sensing operation by connecting the signal transmission line to a receiver that generates an alarm. Since it is possible to transmit from the receiver to the disaster prevention sensor, the reception from the disaster prevention sensor (M
The level signal that changes in level in multiple stages is transmitted to the machine to transmit the smoke detection level,
This has the advantage of being able to distinguish between warnings and actual warnings, and since the self-diagnosis command is transmitted from the receiver to the disaster prevention detector using the superimposed signal on this level signal, the level signal There is an advantage that there is no need to separate the transmission line and the line for transmitting self-diagnosis commands, and the number of lines can be saved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a conventional example, FIG. 2 is a block diagram of another conventional example, FIG. 3 is a block diagram of an embodiment of the present invention, and FIG. 4 is an operation waveform diagram of the same. (6) is the central monitoring and control equipment, (7) is the fire and information line, (9)
) is an intelligence sensor. Agent Patent Attorney Ishi 1) Choshichi

Claims (1)

[Claims] (1) A disaster prevention sensor that sends out a level signal whose level changes in multiple stages according to changes in the sensing state, and a receiver that identifies the multi-stage level signal and generates a report corresponding to each level signal. is connected via a signal transmission line, and a self-diagnosis command that puts the internal circuit of the disaster prevention sensor in the same state as during sensing operation is transmitted from the receiver to the disaster prevention sensor by a superimposed signal that is transmitted superimposed on the level signal. An information transmission method characterized by the fact that it is possible.