JPH0218520B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention connects a plurality of repeaters to a signal line drawn out from a receiver, and connects a plurality of repeaters to a signal line drawn out from a receiver, and connects a fire alarm, gas leak alarm, etc. to each residential unit via each repeater. The present invention relates to a relay device for alarm equipment in an apartment complex that connects to a receiver and relays an alarm signal from the alarm to a receiver.

In recent years, alarm equipment for fires, gas leaks, etc. in communal housing such as public corporations and condominiums has been provided by installing repeaters in each dwelling unit that function as alarm receiving boards for fires, gas leaks, etc. within the dwelling unit. An equipment configuration has been proposed in which a detector for detecting fires, gas leaks, etc. inside the dwelling unit is connected to the detector via a line, and a repeater in each dwelling unit is connected to a central receiver via a line for centralized monitoring.

By the way, in such an alarm system in which a repeater is installed in each dwelling unit, it is necessary to take into account track monitoring between the fire, gas leak, etc. detector and the repeater, and between each repeater and receiver. Instead, multiple residential unit fire or gas leak detectors can be connected to one repeater.
For example, there was a demand for a relay device with a new function different from conventional equipment that is organized by floor, and there was also a desire to further reduce the cost burden on each residential unit as alarm equipment for general residences.

The present invention has been made in view of the above, and includes a plurality of repeaters connected to a signal line drawn out from a receiver, and a fire, gas leak, etc. In a relay device for alarm equipment in an apartment building that connects to an alarm and relays the signal of the alarm to a central receiver, the relay outputs the alarm signal for fire, gas leak, etc. to the receiver, the sensor side line and The purpose is to accurately monitor each of the receiver side lines and to further reduce the cost burden on each dwelling unit.

In order to achieve this object, the present invention first connects a plurality of repeaters in parallel between a pair of signal lines led out from a receiver, and then connects each repeater in turn with a crossover wire to connect the repeaters to each other in turn. Forms a closed loop that sends a line conduction signal during normal power supply.

Next, each repeater is equipped with a first photocoupler that detects a break in the sensor side line and interrupts the closed loop formed by the crossover line, and a low-impedance photocoupler that connects the pair of signal lines from the receiver with an alarm signal for fire, gas leak, etc. A second photocoupler is provided, and the final stage repeater is further provided with a terminating resistor connected to the end of the signal line from the receiver by supplying the line conduction signal from the previous stage repeater.

On the other hand, the receiver includes an alarm reception circuit that detects low impedance between the signal lines of either repeater and receives an alarm, and a circuit that detects discontinuity due to disconnection of the terminating resistor at the final stage repeater and detects line faults. The system is equipped with a fault receiving circuit that notifies the user of the problem.

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a circuit diagram showing one embodiment of the relay device of the present invention, taking fire alarm equipment as an example.

First, to explain the configuration, 1 is a receiver,
The signal line 3 and the common line 4 are each led out from the receiver 1 to the repeaters 10a, 10b...10n, and to the repeater 10a located at the first stage.
Power line 2 that supplies power voltage as a line conduction signal
is being drawn out.

The receiver 1 includes repeaters 10a, 10b,...10n
A transistor Q ₄ and a resistor R ₇ detect the current flowing through the signal line 3 in response to a fire alarm signal from either of the
It has a current detection circuit consisting of ~ _R9 , a transistor
When _Q4 is turned on, reception relay 6 is activated.

Furthermore, a continuity detection circuit for continuity detection including an ammeter 7 and a resistor R ₁₀ is connected in parallel with the current detection circuit including the transistor Q ₄ .

Next, to explain the configuration of the repeaters 10a, 10b,...10n using the repeater 10a as a representative, the power line 2 from the receiver 1 is connected to the terminal IN, the signal line 3 is connected to the terminal L, and the common line 4 is connected to terminal C. Terminals B ₁ , B ₂ , F ₁ , and F ₂ are connected to signal lines from the alarm panel installed in each dwelling unit.
When the fire detector detects a disconnection, the fault signal is sent to the terminal.
Between B ₁ and B ₂ , fire alarm signals when the occurrence of a fire is detected are connected to terminals F ₁ and F ₂ , respectively.
In addition, a light emitting element PC 1 is connected between terminals B ₁ and B ₂ , and the light emitting element PC ₁ emits light in the normal monitoring state and stops emitting light when a disconnection is detected, and receives the light emitted by the light emitting element PC ₁ . The light-receiving element _PC3 , which is electrically conductive, forms a first photocoupler together with the light-emitting element _PC1 . The photodetector PC ₃ is connected to a continuity detection circuit consisting of resistors R ₁ and R ₄ and a transistor Q ₂ and monitors the normal path of the line, and when normal, the photodetector PC 3 turns on the transistor Q ₂ when the photodetector PC ₃ receives light. A line conduction signal from the power line 2 is supplied to the next stage, and on the other hand, when the incidence of light is cut off in the event of a failure, the transistor _Q2 is turned off to cut off the conduction signal line relayed to the next stage repeater. Transistor forming continuity detection circuit
The collector of Q ₂ is drawn out to terminal OUT, and the emitter is drawn out to terminal IN. On the other hand, the terminal
Connected to F ₁ and F ₂ is a light emitting element PC ₂ that emits light upon receiving a fire alarm signal from the dwelling unit alarm panel. A light receiving element _PC4 , which receives and conducts the light emitted by the light emitting element _PC2 , forms a second photocoupler integrally with the light emitting element _PC2 . This light receiving element PC ₄
is connected between the base and collector of transistor Q ₁ , and together with resistors R ₂ and R ₃ constitutes _a fire alarm detection circuit. The impedance between the signal lines 3 and 4 is made low. Furthermore, a transistor Q ₃ is provided in parallel with the transistor Q ₁ , and the transistor Q ₃ is connected to the terminal resistor R ₀₁ provided to monitor disconnection of the fire detector as the collector side, and when the transistor Q ₃ is turned on, the terminal is terminated. It has the function of connecting the resistor R ₀₁ between the signal lines 2 and 3 from the receiver 1. This transistor Q ₃
The base of is connected to a voltage dividing circuit made up of resistors _R5 and _R6 , and the other end of resistor _R6 is drawn out to terminal E.

Note that the circuit section equipped with the terminating resistor R ₀₁ and the transistor Q ₃ is provided to monitor disconnection of the fire detector side line installed in the dwelling unit, but it is terminal E
is not used in the next stage repeater 10a, and is not used in the final stage repeater 1 which will be explained later.
At 0n, the terminals are connected to realize the monitoring function of the fire detector side line.

The circuit configuration of the repeater 10a is the same for the other repeaters 10b to 10n.

Next, signal line connections between the repeaters 10a, 10b, . . . 10n will be explained.

First, signal line 3 and common line 4 from receiver 1
Each of the repeaters 10a and 10a
b, . . . 10n are also connected to repeater terminals L and C, respectively.

On the other hand, the line connection between the repeaters 10a and 10b is such that the terminal OUT of the repeater 10a is connected to the terminal IN of the next stage repeater 10b with a crossover wire 5, and the terminal OUT of the repeater 10b is also connected in the same way. It is connected to the terminal IN of the next-stage repeater (not shown), and also to the terminal of the previous-stage repeater for the last-stage repeater 10n.
A crossover wire 5 from OUT is connected to terminal IN.

Furthermore, repeaters 10 other than the final stage repeater 10n
The terminals E in the terminals a, _10b , .

Next, the operation will be explained.

First, the operation in the normal monitoring state will be explained.
In normal monitoring conditions, all fire detectors are not activated and repeaters 10a, 10b...10n
The light emitting element PC ₂ connected between the respective terminals F ₁ and F ₂ has stopped emitting light.

On the other hand, the light emitting element PC ₁ of each repeater connected between each terminal B ₁ and B ₂ emits light upon receiving the continuity detection signal from the fire detector side, and
Taking example a, when the light emitted by the light emitting element PC ₁ is received, the light receiving element PC ₃ receives power from the receiver 1 and becomes conductive, and the conduction current of the light receiving element PC ₃ flows into the base current of the transistor Q _2. transistor by flowing
Q ₂ turns on.

When this transistor Q ₂ is turned on, power is supplied to the terminal IN from the power line 2 from the receiver 1, so the power as a line conduction signal is transferred from the terminal OUT of the repeater 10a to the next stage via the transistor Q ₂ . is supplied to the terminal IN of the repeater 10b.

Similarly, in the repeater 10b, when the power is supplied to the terminal IN, the light receiving element _PC3 , which receives the light from the light emitting element _PC1 , becomes conductive, and the transistor _Q2 is turned on, and the next stage The line conductor signal is transmitted to the repeater.

Therefore, power as a line conduction signal is supplied to the terminal IN from the previous stage repeater 10n of the final stage repeater 10n, and the power is supplied to the terminal OUT via the transistor _Q2 which is turned on due to the conduction of the light receiving element _PC3 . Power is supplied to the terminal E, and power is further supplied to the terminal E via the signal line. Transistor with this power supply
Q ₃ turns on in response to the divided voltage from resistors R ₅ and R ₆ , and as a result, terminating resistor R ₀₁ is inserted and connected to the ends of signal line 3 and common line 4 from receiver 1 by turning on transistor Q ₃ In this state, a monitoring current determined by the terminating resistor _R01 is passed between the signal line 3 and the common line 4, and the line is monitored on the receiver 1 side.

Next, disconnection detection in the normal monitoring state will be explained.

First, if the connecting line of the fire detector installed in each dwelling unit is disconnected, for example, if the connecting line of the fire detector connected to the repeater 10a via the dwelling unit alarm panel is disconnected, terminal B ₁ , _B2 , the signal supply to the light emitting element _PC1 is cut off, and the light emission is stopped. When the light emitting element PC ₁ stops generating light, the light receiving element PC ₃ turns off, the base current of the transistor Q ₂ stops flowing, the transistor Q ₂ also turns off, and the transmission of the line conduction signal to the next-stage repeaters 10b...10n starts. Cut off.

Therefore, the final stage transistor Q ₂ is also turned off, and the power supply to the transistor Q ₃ is cut off, so that the transistor Q ₃ is turned off. By turning off the transistor _Q3 , the terminating resistor _R01 of the repeater 10n inserted and connected between the signal line 3 and the common line 4 is disconnected, and it is detected that the monitoring current no longer flows in the receiver 1. This allows you to know if the line on the fire detector side is disconnected.

On the other hand, if the power line 2 from the receiver 1 or the crossover line 5 connecting between repeaters is disconnected,
Regardless of the disconnection location, the final stage repeater 1
When the power supply to the terminal E of 0n is cut off, the transistor Q ₃ is turned off, and the monitor current no longer flows through the terminating resistor R ₀₁ , so that the receiver 1 detects a disconnection.

Furthermore, if the signal line 3 or the common line 4 is disconnected, the power supply to the terminating resistor R ₀₁ of the final stage repeater 10n is cut off, or the transistor
When Q ₃ is turned off, the monitoring current is cut off, and the disconnection can be detected in the receiver 1 in the same way.

Incidentally, disconnection in the receiver 1 is detected by observing the meter deflection of the ammeter 7, for example.
Other known means are also possible.

Next, we will explain the operation when the fire detector is activated. For example, if a fire detector connected to the repeater 10a via the dwelling alarm panel detects a fire and is activated, the light emitting element PC ₂ connected between terminals F ₁ and F ₂ is driven to emit light. . The light emitted by the light emitting element PC ₂ is received by the light receiving element PC _{4 .}
Due to the conduction of , a base current flows through the transistor Q ₁ and the transistor Q ₁ is turned on. By turning on this transistor _Q1 , the impedance between the pair of signal lines 3 and 4 from the receiver 1 becomes low, and the current due to the decrease in line impedance flows to the receiver 1.
The divided voltage of the resistors R ₈ and R ₉ turns on the transistor Q ₄ and drives _the relay 6, and the relay contact of the relay 6 (not shown) indicates that a fire has been received.

The relay output of the fire alarm signal caused by the activation of the fire detector is the same for the other relays 10b, . . . 10n.

Furthermore, if failures due to fire and disconnection occur simultaneously or one after another, for example, a failure occurs due to disconnection of the connection line of a fire detector connected to the repeater 10a, and the fire detector of another repeater 10b is damaged. If a fire is detected and a fire alarm signal is output between terminals F ₁ and F ₂ , light emitting element PC ₂ connected between terminals F ₁ and F ₂ of repeater 10b detects the fire alarm signal and emits light. , the transistor Q ₁ is turned on by the conduction of the light-receiving element PC ₄ , and the impedance between the pair of signal lines 3 and 4 from the receiver 1 is made low regardless of disconnection detection in other repeaters. Therefore, if a fire and a fault occur simultaneously, the fire alarm will be received and displayed with priority.

FIG. 2 is a circuit diagram showing another embodiment of the relay device of the present invention, taking gas leak alarm equipment as an example.

First, to explain the configuration, 11 is a receiver, and from the receiver 11, repeaters 20a, 20b...2
A common line 12 and a signal line 13 are drawn out from each of the terminals 0n and connected to terminals C and L, respectively. Also, a repeater 20a located at the first stage
Meanwhile, a power line 14 for supplying power to the receiver as a line conduction signal is drawn out and connected to the terminal OUT.

The receiver 11 is provided with a voltage detection circuit 16 for detecting the signal voltage transmitted from each repeater 20a, 20b, ... 20n via the signal line 13, and the voltage detection circuit 16 detects the signal voltage. The determination is made to indicate whether there is a gas leak, normality, or failure.

On the other hand, each of the repeaters 20a, 20b, . . . 20n has gas leak detectors 30a, 30b, .
0n is connected to the signal line, and this gas leak sensor 30
a, 30b,...30n are powered by commercial AC 100V, and have at least three different types of signals corresponding to the detection state: 6 volts during normal operation, 12 volts when gas leak is detected, and zero volts when the commercial AC 100 V is cut off. Output voltage.

Next, the configuration of the repeaters 20a, 20b, ... 20n will be explained using the repeater 20a as a representative. Resistors R ₁₁ and R ₁₂ are connected in parallel with the gas leak detector 30a, and the resistors R ₁₁ and R ₁₂ are connected in parallel. Piezo voltage transistor Q ₁₁
It's giving a base. The collector of the transistor _Q11 is connected to a light emitting element _PC11 that stops emitting light when a failure occurs in the gas leak sensor 30a, forming a failure detection circuit. This light emitting element PC ₁₁ forms a first photocoupler together with a light receiving element PC ₁₂ which will be described later. Resistor R ₁₄ in parallel with the fault detection circuit with light-emitting element PC ₁₁ and transistor Q ₁₁
A Zener diode ZD ₁₁ that conducts at a signal voltage of 12 volts when gas leakage is detected is connected through the Zener diode ZD 11 , and the anode side of the Zener diode ZD ₁₁ is connected to a resistor R ₁₅ and the base of a transistor Q ₁₂ .
The collector of transistor _Q12 is connected to a light emitting element through a gas leak indicator light LD using a light emitting diode.
Connected to PC ₁₃ . A light receiving element PC ₁₄ , which receives and conducts the light emitted by the light emitting element PC ₁₃ , forms a second photocoupler integrally with the light emitting element PC ₁₃ . Also, a pair of signal lines 1 from the receiver 11
A transistor Q ₁₃ is connected between the transistor Q ₁₃ and the base of the transistor Q 13, and a light receiving element PC ₁₄ is connected between the base and the collector of the transistor Q 13, and the transistor Q ₁₃ is turned on by the conduction of the light receiving element PC ₁₄ . The base of the transistor Q ₁₄ connected in parallel with the transistor Q ₁₃ is biased by the divided voltage of the resistors R ₁₉ and R ₂₀ , and the other end of the resistor R ₂₀ is connected to the relay terminal E. The emitter of the transistor _Q14 is connected to the terminal C, and the collector is connected to the terminal L via the terminating resistor _R21 .

On the other hand, a light receiving element PC ₁₂ , which receives the light emitted by the light emitting element PC ₁₁ and conducts it, is inserted and connected between terminals IN and OUT, detects a fault signal from the fire detector 30a, and supplies it to the next stage repeater. It is possible to interrupt the line conduction signal.

Note that the terminal E drawn out from the circuit including the transistor Q ₁₄ and the resistors R ₁₉ and R ₂₀ is connected to a signal line only at the final stage repeater 20n, as will be explained later.

Next, to explain the interconnection of each repeater 20a, 20b...20n, first, each of the common line 12 and signal line 13 from the receiver 11 is connected to the repeater 20a, 20b...20n.
Similar to 0a, the repeaters 20b, . . . , 20n are also connected to the repeater terminals C and L, respectively.

On the other hand, in the line connection between repeaters 20a and 20b, the terminal IN of repeater 20a is connected to the next stage repeater 20b.
The terminal OUT of the repeater 20b is connected to the terminal OUT by a crossover wire 15, and the terminal IN of the repeater 20b is similarly connected to the terminal OUT of the next stage repeater (not shown) by the crossover wire 15.
Similarly, the terminal OUT of the final stage repeater 20n is connected to the crossover wire 1 from the terminal IN of the previous stage repeater.
5 is connected.

In addition, repeaters 20 other than the final stage repeater 20n
Terminal E in a, 20b, ...20n- ₁ is in an open state, but terminal IN of the same repeater 20n is connected to terminal E only in the final stage repeater 20n by a crossover wire 15. There is. With this crossover connection, in the final stage repeater 20n, a terminating resistor R ₂₁ is connected between terminals C and L via a transistor Q ₁₄ , and a pair of signal lines 13 from the receiver 11 and Terminal resistor R ₂₁ between common wire 12
A monitoring current determined by is flowing.

Next, the operation will be explained.

First, gas leak detectors 30a, 30b...30n
Under normal monitoring conditions, when the gas leak detector 30 outputs a normal signal voltage of 6 volts, all gas leak detectors 30
The light emitting elements PC ₁₁ of the repeaters 20a, 20b, ... 20n emit light due to the normal signal voltage of ₆ volts of the lights a, 30b, . …2
The light is received by the 0n light receiving element _PC12 . on the other hand,
In the final stage repeater 20n, the power from the receiver 11 is applied to the light receiving element PC ₁₂ via resistors R ₁₉ and R ₂₀ , and therefore the repeaters 20a, 20b,
...Each light receiving element PC ₁₂ installed in 20n
A closed loop is formed through which current flows as a line conduction signal. With this current, the voltage divided by the resistors _R19 and _R20 of the final stage repeater 20n is applied to the base of the transistor _Q14 , and the transistor
Q ₁₄ turns on. When the transistor _Q14 is turned on, a current flows through the terminating resistor _R21 , and the voltage divided between the terminating resistor _R21 and the resistor _R22 of the receiver 11 indicates the input voltage of the voltage detection circuit 16 through the signal line 13 to a normal state. The signal voltage is volts, and each repeater 20a, 20
b, . . . 20n, each of which is connected to the gas leak detectors 30a, 30b, . . . 30n is in a normal state.

Next, disconnection detection in the normal monitoring state will be explained.

First, if the connection line of the gas leak detector installed in each dwelling unit is disconnected, for example, the repeater 20
Assume that the connection line of the gas leak detector 30a connected to the gas leak detector 30a is disconnected, the power supply is cut off, and a failure state occurs.

At this time, the output of the gas leak sensor 30a becomes a fault signal voltage of zero volts, and at the same time as the fault is detected, the transistor _Q11 is turned off, and the light emitting element _PC11 is also turned off, stopping the emission of light. When the light emitting element PC ₁₁ stops emitting light, the light receiving element PC ₁₂ turns off, cutting off the closed loop in which the line conduction signal was flowing, and terminating resistor R ₂₁ inserted between the pair of signal lines 12 and 13 from the receiver 11. is disconnected, zero volt is output to the voltage detection circuit 16 of the receiver 11 through the signal line 13, and the receiver 11 can detect the disconnection.

On the other hand, if the power supply line 14 or the crossover line 15 from the receiver 11 is disconnected, the power supply to the terminal E of the final stage repeater 20n is cut off, regardless of the disconnection location, and the transistor _Q14 is disconnected. When the terminal is turned off and the terminating resistor R ₂₁ is disconnected, the receiver 11 detects a disconnection.

Furthermore, regarding disconnection of the signal line 13 or common line 12, the transistor of the final stage repeater 20n
When the power supply to Q ₁₄ is cut off and transistor Q ₃ is turned off, the receiver 11 can similarly detect a disconnection.

Next, the operation when the gas leak detector is activated will be explained. For example, the gas leak detector 3 of the repeater 20b
Gas leak is detected at 0b and the gas leak signal voltage is 12V.
When the output voltage is output, the Zener diode ZD ₁₁ in the repeater 20b becomes conductive, and the base voltage based on the voltage divided by the resistors R ₁₄ and R ₁₅ is applied to the transistor Q ₁₂ , and the transistor Q ₁₂ is turned on. When the transistor Q ₁₂ is turned on, the gas leak indicator lamp LD using a light emitting diode lights up, and the light emitting element PC ₁₃ also becomes conductive and emits light. Light emitting element PC ₁₃
The light emitted is received by the light receiving element PC ₁₄ ,
When the light-receiving element PC ₁₄ becomes conductive, a base current flows through the transistor Q ₁₃ and turns it on, making the impedance between the pair of signal lines 12 and 13 from the receiver 11 low.
Due to this decrease in line impedance, the signal line 13
is approximately 24 volts, which is the same as the common line 12, and when the Zener diode ZD ₁₂ of the receiver 11 is conductive, a voltage of 12 volts indicating a gas leak is given to the voltage detection circuit 16, and the voltage detection circuit 16 detects the gas leak signal voltage.
12V is detected and a gas leak reception indication is performed on the receiver 11 side.

Furthermore, if a failure and a gas leak occur at the same time or in succession, for example, a failure occurs in the gas leak detector 30a connected to the repeater 20a, and the repeater 20
Assuming that the gas leak sensor 30b in b detects a gas leak, the light receiving element PC ₁₄ and transistor Q ₁₃ in the repeater 20b that detected the gas leak are turned on, and the voltage between L and OUT (approximately 24 volts) is determined and the signal is received. Specified by Zener diode ZD ₁₂ in machine 11.
It is converted to 12V, and if a gas leak and a fault occur simultaneously, the gas leak will be given priority and displayed.

As explained above, according to the present invention, a plurality of repeaters are connected to a signal line drawn out from a receiver, and fire, gas leak, etc. In a relay device for alarm equipment in an apartment building, the present invention first connects a plurality of repeaters between a pair of signal lines led out from the receiver, and connects to an alarm device and outputs the alarm signal of the alarm device to a receiver. are connected in parallel, and each repeater is successively interconnected with crossover wires to form a closed loop that transmits a line conduction signal during normal operation with power supplied from the receiver.

Next, each repeater is equipped with a first photocoupler that interrupts the closed loop formed by the crossover wire by detecting a break in the line on the sensor side, and a first photocoupler that cuts off the closed loop caused by the crossover wire by detecting a disconnection in the line on the sensor side. A second photocoupler is provided to provide an impedance, and a terminating resistor is provided at the final stage repeater to be connected to the end of the signal line from the receiver by supplying the line conduction signal from the previous stage repeater.

On the other hand, the receiver includes an alarm reception circuit that detects low impedance between the signal lines of either repeater and receives an alarm, and a circuit that detects discontinuity due to disconnection of the terminating resistor at the final stage repeater and detects line faults. Since a fault receiving circuit is installed to notify the central receiver of alarm signals for fire, gas leak, etc., it is possible to relay output of alarm signals such as fire or gas leak, etc., and to monitor faults in the alarm side line and receiver side line for fire or gas leak etc. Each of the above is realized by the circuit configuration of the relay device, and the effect is that a relay device can be obtained that appropriately and reliably performs the system functions of alarm equipment in an apartment complex.

In addition, as a unique effect of the present invention, even if the connecting line of a fire or gas leak detector is disconnected and becomes a failure state, priority is given to the alarm signal of an emergency fire or gas leak in another dwelling unit. By adopting a circuit configuration that receives and displays the warning information in the event of an emergency, it is possible to issue an appropriate and sufficient warning in the event of an emergency, and to promptly carry out emergency countermeasures or evacuation activities in an apartment complex.

Furthermore, by using the first and second photo couplers and separating and independent the signal transmitter and receiver for the fire or gas leak alarm signal and disconnection signal, malfunctions due to noise etc. are prevented. A stable signal can be obtained and the reliability of the alarm equipment can be further improved.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing an embodiment of the relay device of the present invention, taking fire alarm equipment as an example, and FIG.
FIG. 3 is a circuit diagram showing another embodiment of the relay device according to the present invention, which is intended for gas leak alarm equipment. 1, 11... Receiver, 2, 14... Power line,
3, 13... Signal line, 4, 12... Common line,
5, 15... crossover wire, 6... relay, 7... ammeter, 16... voltage detection circuit, L, E, C, IN,
OUT, B ₁ , B ₂ , F ₁ , F ₂ ... terminal, 10a, 10
b,...10n...repeater, 20a, 20b,...2
0n...Repeater, 30a, 30b,...30n...
Gas leak detector, PC ₁ , PC ₂ , PC ₁₁ , PC ₁₃ ... light emitting element, PC ₃ , PC ₄ , PC ₁₂ , PC ₁₄ ... light receiving element,
LD...Gas leak indicator light, _R11 to _R20 , _R22 ...Resistor, _R01 , _R21 ...Terminal resistor, _Q1 to _Q4 , _Q11 to _Q14
...Transistor, ZD ₁₁ , ZD ₁₂ ...Zena diode.

Claims (1)

[Claims] 1 A plurality of repeaters are connected to the transmission line drawn out from the receiver, and each of the repeaters is installed in each dwelling unit and is operated by the power supply of each dwelling unit to prevent fires, gas leaks, etc. A relay device for alarm equipment in an apartment complex connects an alarm device and relays and outputs an alarm signal from the alarm device to the receiver, wherein the transmission line connects each repeater to the receiver in parallel. and a crossover wire that sequentially connects the power source from the receiver to each repeater as a line conduction signal, and each of the repeaters detects a fault signal from the alarm and connects the crossover wire to each repeater in turn. A first photocoupler that interrupts the line connection, and a second photocoupler that detects an alarm signal from the alarm and makes the impedance between the pair of signal lines low, the first and second photocoupler The system consists of a light-emitting element operated by the power supply of the alarm installed in each dwelling unit and a light-receiving element operated by the power supply of the receiver. and a terminating resistor connected between the pair of signal lines from the receiver when the line conduction signal is normally supplied to the final stage repeater; The system includes an alarm receiving circuit that detects low impedance and receives an alarm, and a fault receiving circuit that monitors continuity between the pair of signal lines and notifies a line fault when non-conduction between the signal lines is detected. A relay device for alarm equipment characterized by: