JPH0542719B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an intelligent fire detector.

[Background technology] Figure 2 shows a self-fire alarm system that uses this type of fire detector.
Individual addresses are assigned to A ₁ ..., and receiver B sequentially accesses the addresses and sends back analog information, which is sensing information from each fire detector A ₁ ..., via transmission line C to determine whether a fire has occurred or not. It is now possible to determine whether

Each fire detector _A1 ... is divided into a base part 1 and a head part 2, as shown in FIG.
receives the transmission signal from receiver B, determines whether or not its own address set in the address section 3 matches the calling address, and converts it into a digital signal in the A/D converter 4, which will be described later. It is equipped with a transmission information conversion section 5 that converts the analog information of the sensor section 7 into a transmission signal format and transmits it, and a power supply section 6, and the head section includes a photoelectric smoke sensor and a sensor that detects smoke ion concentration. It is equipped with a sensor section 7 such as a smoke sensor or a heat sensor, and outputs the detected sensor output to the level detection section 4, and also the power supply section 6.
The power supply Vcc is supplied from the base part 1, and it can be detachably connected to the base part 1, and when connected, the power supply terminals 8, 9, the sensor output terminal 10, and the spare terminal 11 shown in FIG. 4 are connected. are electrically connected to terminals 12 to 15 provided corresponding to the base portion 1.

By the way, as mentioned above, there are various types of the sensor section 7, including an ion type smoke sensor, a photoelectric type smoke sensor,
The output characteristics and the objects to be transduced differ depending on the heat sensing sensor, and therefore, if the type of sensor in the receiver B is incorrect, 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 section can be identified on the receiver side and the system can be operated safely. It is on offer.

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

Embodiment 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. Variable resistor VR to which the supply voltage Vcc is applied so that it can be changed
The voltage value across the variable resistor VR is sent to the base portion 1 via the spare terminal 11 and the terminal 15 as an identification signal. The base section 1 includes a switching circuit 17 consisting of an analog switch that switches between the analog output from the sensing operation from the sensor section 7 of the head section 2 and the analog output from the identification signal generation section 16, and the analog output of the switching circuit 17. The switching circuit 17 converts the input analog output into a control signal based on the control data sent at the time of access by the receiver B to the output of the sensor section 7 or the identification signal. The output of the generator 16 can be switched and selected.

Then, transmit the switching control data of the switching circuit 17 from the receiver B to the sensor concerned whenever necessary or accessed, or at the initial start of the system,
Either the sensor section 7 or the identification signal generating section 16 is selected and the signal is returned from the sensor. The receiver B discriminates the output of the sensor section 7 of the sensor based on this sent information, determines the type, and processes the analog information of the sensor section 7 accordingly.

[Effects of the Invention] As described above, the present invention provides an identification signal generating section in the head section that generates an analog output at a level corresponding to the type of the sensor section separately from the sensor section by setting an impedance value. a switching circuit that selectively outputs either the analog output from the identification signal generation section or the analog output from the sensor section;
A/D converts the output of the switching circuit into a digital signal
A conversion circuit is provided in the base section, and the transmission information conversion section selects the output of the switching circuit based on the control data transmitted from the receiver at the time of the call from the receiver, and also selects the output of the switching circuit based on the control data transmitted from the receiver at the time of the call from the receiver, and the A corresponding to the selected analog output. Since the output of the /D conversion circuit is sent back to the receiver, even if fire detectors equipped with various sensor parts are used in the same system, they can be identified on the receiver side. Setting errors can be prevented and the system can be operated safely, and since the type can be identified on the receiver side even when reinstalling after removal during maintenance, operation can be resumed safely. Furthermore, both the fire-related information from the sensor unit and the information related to the sensor unit type are output as analog outputs, and the fire-related information and the sensor unit type information are output based on the control data transmitted when the receiver calls. one of them is selected by a switching circuit,
The A/D conversion circuit converts the signal into a digital signal and then transmits it to the receiver, and while the same format of signal is transmitted to the receiver, the signal is sent back to the receiver according to the control data from the receiver. The meaning of the signal will change. That is, both the sensor section and the identification signal generation section generate analog outputs,
By selecting one of the analog outputs with the switching circuit, the A/D conversion circuit and the transmission information conversion section can be shared for both types of information, which has the advantage of simplifying the circuit configuration. Moreover, if the receiver captures information regarding the type of each sensor section at an appropriate time, it will be able to receive only fire-related information from the sensor sections from now on.
Compared to the case where information regarding the fire and information regarding the type of sensor section are transmitted at the same time, the amount of information transmitted per call is reduced. As a result, even while transmitting information regarding the type of sensor unit, urgent information regarding a fire can be transmitted quickly without reducing the transmission speed. In addition, since the identification signal generation section only changes the impedance value depending on the type of sensor section, there is an advantage that the configuration of the identification signal generation section is simplified.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram of an embodiment of the present invention, Fig. 2 is a schematic diagram of the entire self-fire alarm system, Fig. 3 is a circuit diagram of a conventional fire detector, and Fig. 4 is a diagram of the base and head. 1 is a perspective view of the parts, 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, and 17 is a switching circuit.

Claims (1)

[Claims] 1. A sensor section that generates an analog output is provided in the head section, and a base section to which the head section is detachably connected converts the analog information from the sensor section into a multiplexed transmission signal and transmits it via the transmission line when called by the receiver. In a fire detector equipped with a transmission information conversion unit that transmits information to a receiver, an identification signal generation unit that generates an analog output at a level corresponding to the type of sensor unit separately from the sensor unit by setting an impedance value. A switching circuit provided in the head section that selectively outputs either the analog output from the identification signal generation section or the analog output from the sensor section, and an A/D that converts the output of the switching circuit into a digital signal.
A conversion circuit is provided in the base section, and the transmission information conversion section selects the output of the switching circuit based on control data transmitted from the receiver at the time of a call from the receiver, and also corresponds to the selected analog output. A fire detector characterized in that the output of an A/D conversion circuit is sent back to a receiver.