JPS61220093A - Fire sensor - 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] [Technique, ? ! FIELD J This invention relates to intelligent fire detectors.

[Background Art 1] Figure 2 shows a self-fire alarm system that uses this type of fire detector.In this system, each fire detector A, ... is assigned an individual address, and the addresses are sequentially assigned starting from the receiving 1flB. is accessed and analog information, which is the sensing information from each fire detector A, .

Each fire detector A, . . . is divided into a base part 1 and a head part 2, as shown in FIG.
The sensor unit receives the transmission signal from flB and determines whether or not the own address set in the address unit 3 and the calling address match, and the sensor unit converts it into a digital signal in the A/D converter 4, which will be described later. a transmission information converter 5 that converts 70 analog information into a transmission signal format and transmits it;
The head part 2 is equipped with a sensor part 7 such as a photoelectric smoke sensor, a smoke sensor that detects smoke ion concentration, or a heat sensor, and the detected sensor output is sent to the level detection part 4. At the same time, the power supply V is output from the above power supply section 6 to
cc is supplied, and can be detachably connected to the base part 1. When connected, the power terminal 8.9 shown in the tlfJ4 diagram, the sensor output terminal 10, and the spare terminal 11 are connected to the base part 1. Terminals 12 to 1 are provided corresponding to 1.
5.

By the way, as mentioned above, there are various types of sensor parts.
The ion type smoke sensor, photoelectric type smoke sensor, and heat sensing sensor have different output characteristics and transshoot targets, so if the type of sensor is wrong in the receiving 1flB, the system will not operate correctly.

Object of the Invention The present invention has been made in view of the above-mentioned problems, and its purpose is to provide a fire detector in which the sensor part can be identified on the receiver side and the system can be operated safely. It is on offer.

[Disclosure of the invention 1 The present invention will be explained below with reference to Examples.

11 animals FIG. 1 shows this embodiment. In this embodiment, an identification signal generation section 16 is provided in the head section 2, and this identification signal generation section 16 generates an impedance value according to the type of the sensor section 7. A variable resistor VR is provided to which a power supply voltage Vec is applied so that it can be changed, and the voltage value across the variable resistor VR is sent as an identification signal to the base part 1 via the preliminary terminal 11 and the terminal 15. ing. The base part 1 has an analog switch to switch between the analog output from the sensing operation from the sensor part 7 of the head part 2 and the analog output from the identification signal generating part 16, and an analog output from the switching circuit 17. A to digitally convert
The switching circuit 17 is equipped with a D converter 4 and a switching circuit 17 based on the control data sent at the time of access by the receiver B.
The input analog output is switched between the output of the sensor section 7 and the output of the identification signal generation section 16 using a control signal.

When necessary, each time access is made, or at the initial start of the system, the switching control data of the switching circuit 17 is transmitted from the receiving FIB to the sensor concerned, and either the sensor section 7 or the identification signal generation section 16 is selectively switched. It is sent back from the sensor. The receiving fiB discriminates the output of the sensor unit 7 of the sensor based on this sent information, determines the type, and selects the sensor unit 7 according to the type.
It processes the Anamigu information.

Effects of the Invention The present invention provides an identification signal generation section in the head section that changes the impedance value depending on the type of sensor section to generate analog outputs of different levels, and the base section has an identification signal generation section that generates analog outputs of different levels according to the type of sensor section. A switching circuit that switches between the output and the analog output of the sensor section, and A that takes in the analog output that is switched and output by the switching circuit and converts it into digital.
/D conversion circuit, which captures the digital signal from the A/D conversion circuit and transmits it to the receiver via the transmission information conversion section, and switches the switching circuit according to the control data from the receiver, so that it can be used for various sensors. Even if fire detectors equipped with two parts are used in the same system, they can be identified on the receiver side, which prevents incorrect installation and settings, allowing safe system operation. The installation has the effect of safely resuming operation because the type can be identified on the receiver side, and the A/D converter can be shared between the sensor section and the identification signal generation section, and it is easy to switch. Since the analog output is taken in by the receiver, the monitoring function of the device is not restricted by identification information, and since switching cannot be done by transmitting control data from the receiver side, it is easy to make it respond to the system operation. effective.

[Brief explanation of drawings]

Fig. 1 is a circuit configuration diagram of an embodiment of the present invention, Fig. 2 is an overall schematic configuration diagram of a self-fire alarm system, Fig. 3 is a circuit diagram of a conventional fire detector, and Fig. 4 is a base part and head. 1 is a perspective view of the unit, 1 is a base part, 2 is a head part, 5 is a transmission information converter, 4 is an A/D converter, 16 is an identification signal generator, 1
7 is a switching circuit. Agent Patent Attorney Ishi 1) Ai 7th 1 Figure 2v! J

Claims (1)

[Claims] (1) A sensor section that generates an analog output is provided in the head, and the analog information from the sensor section is converted into a multiplexed transmission signal on a base to which the head is detachably connected, and the signal is transmitted via a transmission line when called by the receiver. In a fire detector equipped with a transmission information conversion section for transmission to a receiver, an identification signal generation section is provided in the head section to generate analog outputs of different levels by changing the impedance value depending on the type of the sensor section,
The base section includes a switching circuit that switches between the analog output from the identification signal generation section and the analog output of the sensor section, and an A/D conversion circuit that takes in the analog output that is switched and output by the switching circuit and performs digital conversion. and
A fire detector characterized in that a digital signal from the A/D conversion circuit is taken in and transmitted to a receiver via a transmission information conversion section, and the switching circuit is switched according to control data from the receiver.