JPH0348397A - Fire sensing terminal equipment - Google Patents

Abstract

PURPOSE:To reduce the number of connection terminals between a head and a base by using sort terminals and alarm generating test terminals in common. CONSTITUTION:A transmission control part 4 for selectively executing fire monitoring operation, sort returning operation or alarm generation testing operation in accordance with a control signal received from the external through a transmission line l and a terminal switching part 6 receiving an alarm generation testing signal from the control part 4 to its sort terminal P3 at the time of alarm generation testing operation are formed on a base B. An alarm generation testing part 2 for forcedly setting up a fire alarm 1 to an alarm generation state in accordance with an alarm generation testing signal obtained from the terminal P3 is formed on the head H. Thereby, an alarm generation test based upon remote control can be executed by using only four terminals, i.e. a power supply terminal P1, an analog signal terminal P2, a sort terminal P3, and a remote control terminal P4, as connection terminals between the head H and the base B. Consequently, the number of connection terminals between the based H and the base B can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a fire detection terminal device, which is used in an automatic fire alarm system using time division multiplex transmission technology.

[Prior Art] Figure 2 is a schematic diagram of an automatic fire alarm system using a time division multiplex transmission method. This system consists of N terminals T. , T2,..., TN are monitored by one receiver (or repeater) R. Each terminal T. -T
8 are connected to the receiving fiR via transmission line l. and heads H1 to H. which are detachably attached to the bases B to BH. Consisting of Heads H and ~HN have built-in fire detectors that generate analog fire detection signals. Base B, ~B. converts the analog fire detection signal obtained from the heads H, ~HN into a digital signal, and sends this digital signal back to the receiver R. Head H, ~H. The built-in fire detectors include a smoke concentration sensor that generates an analog signal according to the smoke concentration, a room temperature sensor that generates an analog signal according to the room temperature, or a smoke sensor that generates an analog signal according to the room temperature. There are several types of infrared sensors, such as infrared sensors that generate analog signals depending on the amount of infrared radiation detected. Therefore, at the time of initial polling in which the receiver R first polls each of the terminals T1 to TN, each of the terminals T, to T. A signal indicating the type of fire detector provided by the terminal device R is sent back to the receiver R, and each terminal device T1 to T. Create a table showing the correspondence between addresses and types of fire detectors. Then, during subsequent polling, the terminal device T1
~ Based on the above table, it is determined whether the signal returned from the TN is a smoke concentration signal, a room temperature detection signal, or an infrared detection signal. A signal indicating the type of fire detector is sent to the head H1~
H. From base B, ~B. head H1 to give
~HN includes a type terminal in addition to an analog signal terminal. In addition, heads H, ~H. Since it receives power from the bases B1 to BN, it has a power terminal and a common terminal (ground terminal). Therefore, head H, ~}{N
and bases B and ~BN are connected with 4 terminals. [Problems to be Solved by the Invention] In an automatic fire alarm system, it is necessary to periodically check whether each fire detector can issue an alarm normally.

However, in a system that mixes many types of fire detectors as described above, it is necessary to generate smoke, raise the room temperature, and generate infrared rays caused by flames near the fire detectors. Moreover, since each fire detector is distributed over a wide area, it is necessary to generate many types of simulated fires in different locations, making it difficult to conduct periodic inspections. Therefore, from the receiver R to each terminal T, ~
It is conceivable to transmit alarm test signals to the TN and conduct alarm tests of various types of fire detectors by remote control without actually causing a simulated fire. However, in the above system, each terminal T, ~TN is connected! B1 to BN and head H. -HN, there is a problem in that one extra connection terminal must be added in order to transmit the alarm test signal from the bases B1 to BN to the heads H and -HH. The present invention has been made in view of these points, and its purpose is to provide a head equipped with a built-in fire detector that outputs analog signals necessary for fire detection, and a device that digitizes and transmits the analog signals. The purpose of this invention is to reduce the number of connection terminals between the head and the base by sharing the type terminal and the alarm test terminal in a fire detection terminal consisting of a base and a head. [Means and Means for Solving the Problems] In order to solve the above problems, the fire detection terminal according to the present invention outputs an analog signal necessary for fire detection, as shown in FIG. It has a built-in fire detector 1 and an alarm test section 2 that forcibly sets the fire detector 1 to an alarm state, and a power terminal P1 for receiving power supply and an analog signal from the fire detector 1. The type terminal P2 includes an analog signal terminal P2 for outputting a signal, a type terminal P3 for outputting a type signal indicating the type of the fire detector 1, and a common terminal P4 shared by each of the terminals P1 to T3. P3
is connected to the control input of the alarm test section 2, and a first resistor R1 for indicating the type of the fire detector 1 is connected between the type terminal P3 and the common terminal P4; A base B is detachably connected to the base B, receives address signals and control signals via an external transmission line l, and sends back a reply signal, and the base B has an address setting section 3 that sets a unique address. When the address signal received via the external transmission line 1 matches the address set in the address setting unit 3, the fire monitoring operation, type reply operation, and alarm are performed according to the control signal corresponding to the address signal. A transmission control unit 4 that selectively executes a test operation, and a first resistor R.
1 and a second resistor R2 that divides the reference voltage Vref to control the type signal, and a transmission control unit 4 that digitizes the analog signal obtained at the analog signal terminal P2 during fire monitoring operation and alarm test operation. The A/D converter 5 digitizes the type signal obtained at the type terminal P3 during the type reply operation and uses it as a reply signal for the transmission control unit 4, and the A/D converter 5 receives the type signal from the transmission control unit 4 from the type terminal during the alarm test operation. The device is characterized in that it includes a terminal switching section 6 that provides an alarm test signal to P3.

[Function] In this way, the present invention provides a transmission system that selectively executes the fire monitoring operation, the type reply operation, and the alarm test operation in accordance with the control signal received from the outside via the transmission line l. The control unit 4 and the type terminal P from the transmission control unit 4 during the alarm test operation.
A terminal switching section 6 for supplying an alarm test signal to the type terminal P3 is provided on the base B, and the head H is configured to forcibly set the fire detector 1 to the alarm state in response to the alarm test signal obtained from the type terminal P3. Since the alarm test section 2 is provided, the connection terminals between the head H and the base B remain the same as the four terminals: power terminal P1, analog signal terminal P2, type terminal P3, and common terminal P4, and the alarm test can be performed by remote control. It becomes possible to do this. [Embodiment] FIG. 1 is a block diagram of a fire detection end wood device T according to an embodiment of the present invention. This fire detection terminal T consists of a head H for fire detection and a base B for signal transmission. The head H has an analog fire detector 1 built-in. The fire detector 1 may include, for example, a smoke concentration sensor that generates an analog signal according to the smoke concentration, a room temperature sensor that generates an analog signal according to the room temperature, or a 4.3μ wavelength sensor included in the flame. There are several types of infrared sensors, such as infrared sensors that generate analog signals depending on the amount of infrared rays detected.

Therefore, the head H has a built-in first resistor R1 to indicate the type of fire detector 1. The resistance value of this resistor R1 is set to a different value depending on the type of fire detector 1. The alarm test section 2 forcibly sets the fire detector 1 to an alarm state during an alarm test operation to be described later. The alarm state of the fire detector 1 is a state in which, for example, a smoke concentration detection signal of a certain concentration or more, a room temperature detection signal of a certain temperature or more, and an infrared detection signal of a certain amount or more are output as analog signals. The fire detector 1 and the alarm test section 2 are operated by being powered by a power supply voltage supplied between the power terminal P1 and the common terminal P4. The analog signal obtained from the fire detector 1 is given to the base B via the analog signal terminal P2. In addition, the type terminal P3 is also used as an alarm test signal terminal, and during the type reply operation described later, a voltage corresponding to the value of the resistor R1 is generated as an analog signal at the type terminal P3, and is used for the alarm test operation described later. Sometimes, the alarm test signal is input to the control input of the alarm test section 2 using the resistor R1 as an input resistance. The base B includes a transmission control section 4 connected to an external transmission line l. The transmission line l is a two-way cable such as a coaxial cable.
As shown in FIG. 2, a plurality of terminals T, -TN and one receiver R are connected in parallel between the lines. Reception tl! From R, a start signal indicating the start of signal transmission, an address signal for specifying the terminal to communicate with, a control signal for controlling the operation of the terminal, and a reply signal from the terminal are received. A time division multiplexed transmission signal including at least a response time zone and an end signal indicating the end of signal transmission is sent to the transmission line l. Address signals and control signals are, for example, long voltage pulses.
", the short voltage pulse consists of a multi-bit (e.g. 8 bits) serial signal that means "O". In the reply time period, for example, a voltage is applied between the lines of the transmission ml on the receiver R side, and the terminal device By short-circuiting the lines of the transmission line l via a resistor on the side of Reply to receiver R. Address signals and control signals are sent from the receiver R as low-impedance voltage signals, and at the bases B+ to BN of each terminal T1 to TN, a rectifier and a smoothing capacitor are connected between the transmission lines e. Obtains operating power. A reference voltage Vref is generated from this operating power supply, and power is supplied to the power supply terminal P1.

The address signal included in the time-division multiplex transmission signal sent from receiver R changes so as to poll each terminal device T, ~TN cyclically, and only one terminal device with a matching address signal is polled. It performs control operations and reply operations according to control signals. In order to allocate this address signal, the base B is equipped with an address setting section 3. The address setting unit 3 is composed of a DIR switch, an E2FROM, etc., and unique address signals are set for each of the terminals T1 to TN so as not to overlap. When the transmission control unit 4 receives the start signal from the transmission line l, it receives the following address signal and compares it with its own address signal set in the address setting unit 3. If the address signals do not match, wait for the next start signal to be received. If the address signals match, the control signal that follows is received;
Depending on the control signal, fire monitoring operation, type reply operation, and alarm test operation are selectively executed. Each operation will be explained below.

(i> Type reply operation When the receiver R performs the first polling after system installation,
A control signal specifying the type reply operation is sent to each terminal T1 to TN.
give to In this case, the terminal device T polled by the reception lllR divides the reference voltage Vref by the resistor R2 in the base B and the resistor R1 in the head H, and divides the voltage at the type terminal P3 into A/ The D converter 5 converts the signal into a digital signal and sends it back to the receiver R. This results in
The receiver R stores the correspondence relationship between the address of each terminal T1 to TI1 and the type of fire detector 1 built into the terminal T, to TN as a table. (ii> At the time of polling after the second time of fire monitoring operation, the receiving fiR gives a control signal specifying the fire monitoring operation to each terminal device T. to TN. In this case, the terminal device T.
The analog signal obtained from the fire/disaster detector 1 via the analog signal terminal P2 is converted into a digital signal by the A/D converter 5 and sent back to the receiver R. As a result, the receiver R can digitize and receive analog signals necessary for fire detection from each terminal T+ to TN.
By referring to the table information created at the time of initial polling, it is determined whether the received signal is a signal indicating the smoke concentration, a signal indicating the room temperature, or a signal indicating the detected amount of infrared rays.

(iii) Alarm test operation Next, during periodic inspection, the receiver R provides a control signal specifying an alarm test operation to each terminal T, -TH. In this case, the terminal device T polled by the receiver R switches the terminal switching section 6 under the control of the transmission control section 4, and the terminal device T switches the terminal switching section 6 from the transmission control section 4 to the terminal switching section 6 and the type terminal P3. Input the alarm control signal to the alarm test section 2. Although the content 6 of this alarm control signal is not particularly limited, it is sufficient that the signal is different from the predetermined voltage signal obtained at the type terminal P3 during the fire monitoring operation or type reply operation.

This alarm control signal causes the alarm test section 2 to operate, and the fire detector 1 is forcibly set to the alarm state. In other words,
The analog signal output from the fire detector 1 has the voltage level at the time of fire occurrence.

This analog signal is sent to A via analog signal terminal P2.
/D converter 5, converted into a digital signal,
It is sent back from the transmission control unit 4 to the receiver R. This results in
The receiver R is capable of conducting an alarm test of the fire detector 1 built into each of the terminals T, -TN by remote control. [Effects of the Invention] As described above, the present invention includes a head equipped with a built-in fire detector that outputs an analog signal necessary for fire detection;
A fire detection terminal device consisting of a base that digitizes and transmits the above analog signal, has an alarm test section built into the head that forcibly sets the fire detector to an alarm state, and receives signals from the outside via a transmission line. It is based on a transmission control section that selectively executes fire monitoring operation, type reply operation, and alarm test operation according to the received control signal, and a terminal switching section that switches the function of the type terminal under the control of the transmission control section. The type terminal is built in and used as a type terminal for giving a type signal from the head to the base during type reply operation, and as a firing test signal terminal for giving a firing test signal from the base to the head during firing test operation. This has the effect of reducing the number of connection terminals between the head and base.

[Brief explanation of drawings]

Figure 1 is a block diagram of an embodiment of the present invention, and Figure 2 is a schematic elliptical diagram of a conventional automatic fire alarm system.

Claims (1)

[Claims] (1) A built-in fire detector that outputs analog signals necessary for fire detection and an alarm test section that forcibly sets the fire detector to an alarm state, and a power terminal for receiving power supply; The type terminal includes an analog signal terminal for outputting an analog signal from the fire detector, a type terminal for outputting a type signal indicating the type of the fire detector, and a common terminal shared by each of the above terminals. a head which is connected to the control input of the alarm test section and has a first resistor connected between the type terminal and the common terminal for indicating the type of the fire detector, and the head is removably connected, It consists of a base that receives address signals and control signals via an external transmission line, and sends back a reply signal, and the base includes an address setting section that sets a unique address, and a base that receives address signals and control signals via an external transmission line. a transmission control unit that selectively executes a fire monitoring operation, a type reply operation, and an alarm test operation in accordance with a control signal corresponding to the address signal when the address signal matches the address set in the address setting unit; A second resistor that divides the reference voltage together with the first resistor to create a type signal, and a second resistor that digitizes the analog signal obtained at the analog signal terminal during fire monitoring operation and alarm test operation and controls the transmission control unit. An A/D converter unit that digitizes the type signal obtained at the type terminal during the type reply operation and uses it as a reply signal for the transmission control unit; and an A/D converter unit that digitizes the type signal obtained at the type terminal during the type reply operation and outputs an alarm test signal from the transmission control unit to the type terminal during the alarm test operation. A fire detection terminal device comprising: a terminal switching unit that provides