JPH0377554B2 - - 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 detects the detection status of a gas leak detector connected to each repeater, that is, normal, gas leak, The present invention relates to a repeater for a gas leak alarm system in an apartment complex so as to transmit at least three different signal voltages to a receiver side depending on a trouble.

Conventionally, as this type of gas leak alarm equipment, for example, there is a signal transmission device disclosed in Japanese Patent Application No. 129696/1983 by the same applicant, and this device normally outputs 6 volts,
Connect a gas leak detector that outputs a voltage signal of 12 volts due to a gas leak, and 0 volts in the event of a problem where the commercial AC 100 V power is cut off, to the relay, and directly adjust the voltage of the relay with the output voltage of the gas leak detector. The comparators are activated and each signal voltage is transmitted to the receiver via the relay located at the front stage.

However, in the case of gas leak alarm equipment in apartment buildings, the number of repeaters connected to each signal line drawn out from the receiver increases, and the output voltage of the gas leak detector is transmitted via the previous stage repeater. In the above-mentioned device for transmitting signal to a receiver, there is a large loss in signal voltage when passing through a repeater located at the previous stage, which limits the number of repeaters that can be installed, and it is difficult to achieve a long transmission distance.

The present invention was made in view of these problems, and involves connecting a plurality of repeaters to a signal line drawn out from a receiver, and detecting a gas leakage sensor connected to each repeater according to the detection state of the gas leak detector connected to each repeater. In a gas leak alarm equipment repeater that transmits at least three different signal voltages to the receiver side, when the gas leak signal voltage of the gas leak detector is detected, the signal is drawn in parallel to each repeater. 1st from the receiver
The gas leak signal voltage is relayed to the signal line of the gas leak detector, and when the normal signal voltage of the gas leak detector is detected, the signal voltage supplied via the second signal line from the receiver is sent to the subsequent repeater. The normal signal voltage is sequentially relayed, and the terminal element installed in the final stage repeater converts it to a specified voltage, and the first signal from the receiver is
By outputting to the signal line from the receiver, the loss of the relay signal voltage is small and the number of signal lines between the receiver and each repeater does not increase, so even if many repeaters are connected to the signal line from the receiver. It is an object of the present invention to provide a repeater for gas leak alarm equipment in an apartment building that can reliably relay each signal voltage corresponding to a detection state.

Hereinafter, the present invention will be explained based on the drawings.

The figure is a circuit diagram showing an embodiment of the present invention.

First, to explain the configuration, 1 is a receiver,
A repeater 10 installed in each dwelling unit is used instead of a receiver 1.
A, 10b...10n, the first signal line 2 is drawn out, and the repeater 1 located at the first stage
0a, a second signal line 2' that supplies the power supply voltage as a signal voltage is drawn out, and is further connected to a common line 3.
is drawn out to each repeater 10a to 10n.

The receiver 1 is provided with a voltage detection circuit 5 for detecting the signal voltage transmitted from each repeater 10a to 10n via the first signal line 2, and the voltage detection circuit 5 discriminates the signal voltage. The system is designed to display gas leak, normal status, or trouble reception information.

On the other hand, gas leak detectors 20a, 20b...20n are connected to signal lines to each of the repeaters 10a to 10n, and these gas leak detectors 20a to 20n are powered by commercial AC 100V, and are powered at 6 volts during normal operation to detect gas leaks. It outputs at least three different signal voltages depending on the detected state: 12 volts at times, and 0 volts when the commercial AC 100V is cut off.

Next, the configuration of the repeaters 10a to 10n is
To explain point a as a representative, the output line of the gas leak detector 20a is connected to resistors R ₁ and R ₂ via a Zener diode ZD ₁ that conducts at a signal voltage of 6 volts during normal operation.
are connected to apply the divided voltage of resistors R ₁ and R ₂ to the base of transistor Q ₁ , and the collector of transistor Q ₁ is connected to the base of transistor Q ₂ via resistor R ₃ .

This Zener diode ZD ₁ and transistor Q ₁
The circuit having this becomes a circuit that detects the normal signal voltage of 6 volts from the gas leak sensor 20a.

The emitter of transistor Q ₂ , which has the collector of transistor Q ₁ connected to its base, is connected to terminal IN, which is connected to the second signal line 2' from receiver 1, and the collector of transistor Q ₂ is drawn out to terminal OUT, and is connected to the terminal IN, which is connected to the second signal line 2' from receiver 1. It is connected to the terminal IN which is the emitter side of the transistor Q ₂ of the next stage repeater 10b by the wire 4, and the transistor Q ₂ is connected to the gas leak detector 20a.
is turned on by a normal signal voltage of 6 volts, and receiver 1
A normal signal voltage circuit is constructed which connects the signal voltage from the second stage as a normal signal voltage to the next stage repeater.

On the other hand, a transistor Q ₃ , a Zener diode ZD ₂ and a resistor are connected to the signal line of the gas leak detector 20a.
A voltage detection circuit consisting of R ₅ and R ₆ is provided, and the Zener diode ZD ₂ becomes conductive when the gas leak detector 20a outputs a gas leak signal voltage of 12 volts to drive the transistor Q ₃ at a constant voltage, and the diode D ₁ A gas leak signal detection circuit is formed which sends a gas leak signal voltage of 12 volts from the receiver 1 to the first signal line 2 via the receiver 1.

Further, a resistor R ₇ and a Zener diode ZD ₃ having a Zener voltage of 6 volts are connected in series between the terminal EL ₁ and the terminal C of the repeater 10a, and the terminal is connected from the cathode side of the Zener diode ZD ₃ through the diode D ₂ . Connected to EL ₂ .

This circuit including the resistor R ₇ , the Zener diode ZD ₃ and the diode D ₂ is connected to the signal line only at the final stage repeater 10n, as will be explained later.

Next, to explain the interconnection of each repeater 10a to 10n, the terminal OUT of the repeater 10a is connected to the terminal IN of the next stage repeater 10b by a crossover wire 4,
The terminal OUT of the repeater 10b is also connected to the terminal IN of the next stage repeater (not shown) by a crossover wire 4, and the terminal IN of the final stage repeater 10n is connected to the crossover wire 4 from the terminal OUT of the previous stage repeater. Connected.

In addition, in the final stage repeater 10n, the terminal OUT, which is the collector side of transistor Q ₂ , is connected to the terminal OUT.
Connect to EL ₁ and connect terminal EL ₂ to the first terminal from receiver 1.
This signal line connection connects the Zener diode in the final stage repeater 10n.
ZD ₃ is the first connection from receiver 1 via diode D ₂ .
This serves as a terminating element that is inserted and connected to the terminal end of the signal line 2 and common line 3.

Next, the action will be explained.

First, in the steady monitoring state where the gas leak detectors 20a to 20n output a normal signal voltage of 6 volts, the normal signal voltage of the gas leak sensor 20a is 6 volts.
Zener diode of repeater 10a by bolt
ZD ₁ becomes conductive, transistor Q ₁ is turned on by the voltage divided by resistors R ₁ and R ₂ , and transistor Q ₂ is turned on by turning on transistor Q ₁ .

When this transistor Q ₂ is turned on, the signal voltage (power supply voltage) supplied from the receiver 1 via the second signal line 2' is relayed and output from the transistor Q ₂ to the next stage repeater 10b as a normal signal voltage. ,
Also in the repeater 10b, the transistor Q ₁ ,
Since _Q2 is on, the normal signal voltage from the repeater 10a is further relayed and output to the next stage repeater.

Therefore, the transistor of the final stage repeater 10n
Repeaters 10a and 10b are also used for the emitter of _Q2 .
A signal voltage is supplied from the second signal line 2' from the receiver 1 which is sequentially relayed from ..., and similarly, transistors Q ₁ and Q ₂ are turned on by the normal signal voltage of 6 volts from the gas leak detector 20n. Because
A signal voltage is supplied to the Zener diode ZD ₃ via the transistor Q ₂ and the resistor R ₇ and is converted to a specified voltage of 6 volts in the Zener diode ZD ₃ ,
A specified voltage of 6 volts is sent to the first signal line from the receiver 1 via the diode _D2 .

Therefore, the voltage detection circuit 5 of the receiver 1 detects the Zener voltage of the Zener diode ZD ₃ as a termination element in the final stage repeater 10n, and since this detected voltage is 6 volts, each repeater 10a to 1
It receives and displays that the gas leak detectors 20a to 20n of 0n are in a normal state.

Next, if the gas leak sensor 20a of the repeater 10a detects a gas leak and outputs a gas leak signal voltage of 12 volts, the Zener diode _ZD2 in the repeater 10a becomes conductive, and the constant voltage control of the transistor _Q3 A gas leak signal voltage of 12 volts is outputted to the first signal line 2 from the receiver 1 via the diode _D1 , and this signal voltage is detected by the voltage detection circuit 5 to indicate gas leak and reception.

Furthermore, for example, the gas leak detector 20 of the repeater 10a
If the commercial AC 100V supply to a is cut off and a trouble signal voltage of 0 volts is output, the transistor that was turned on at a normal signal voltage of 6 volts.
Q ₁ and Q ₂ are turned off, and the subsequent repeaters 10b to 1
Cut off the relay connection of the normal signal voltage to 0n,
Therefore, the signal voltage supply to the terminal IN of the final stage repeater 10n is cut off, and the transistor
Since Q ₂ is turned off and the signal voltage is no longer supplied to the Zener diode ZD ₃ as a termination element,
The signal voltage of the first signal line 2 from the receiver 1 becomes 0 volts, and this signal voltage of 0 volts is detected by the voltage detection circuit 5 of the receiver 1, and a trouble is received and indicated.

Furthermore, there is trouble with repeater 10a, repeater 10
If a gas leak is detected at the same time in b, the gas leak signal voltage of the repeater 10b that detected the gas leak
The signal voltage of the first signal line 2 is determined by 12 volts, so that if a gas leak and trouble occur simultaneously, the gas leak will be given priority for reception and display.

As explained above, according to the present invention, a plurality of repeaters are connected to a signal line drawn out from a receiver, and at least three types of signals are detected depending on the detection state of the gas leak detector connected to each repeater. In a gas leak alarm system repeater that transmits different signal voltages to the receiver side, when the gas leak signal voltage of the gas leak detector is detected, the signal voltage from the receiver connected in parallel to each repeater is The gas leak signal voltage is relayed to the first signal line, and when the normal signal voltage of the gas leak detector is detected, the second signal voltage is output from the signal line.
The signal voltage supplied through the signal line of When the trouble signal voltage of the gas leak detector is detected, the relay connection of the normal signal voltage to the subsequent repeater is prohibited, and the converted voltage of the termination element installed in the final repeater is set to 0 volts. Since the signal is output to the first signal line from the receiver, the relay output according to the detection state of the gas leak detector in each repeater can be directly relayed and output to the signal line from the receiver. Voltage loss is determined only by the signal line from the receiver, and the number of repeaters that can be connected to one line from the receiver can be easily increased. Since the signal voltage from the power supply is converted by a terminating element and relayed to the receiver, the effect of transmission loss can be significantly reduced even when the signal voltage is low, and there are three wires between the receiver and multiple repeaters. It also has the effect of simplifying equipment construction since only a signal line connection is required.

[Brief explanation of drawings]

The figure is a circuit diagram showing one embodiment of the present invention. 1... Receiver, 2... First signal line, 2'...
2nd signal line, 3... common line, 4... crossover wire,
5... Voltage detection circuit, 10a, 10b, 10n...
...Repeater, 20a, 20b, 20n...Gas leak detector, _Q1 to _Q3 ...Transistor, _ZD1 , _ZD2 ...
...Zena diode, ZD ₃ ...Zena diode (terminal element).

Claims (1)

[Claims] 1. A plurality of repeaters are connected to a signal line drawn out from a receiver, and at least three different signal voltages are outputted depending on the detection state of a gas leak detector connected to each repeater. In a repeater of gas leak alarm equipment configured to transmit data to a receiver side, when a gas leak signal voltage output from a gas leak sensor is detected, the gas leak signal voltage is transmitted to a first signal line from the receiver. a gas leak signal detection circuit that relays and outputs a signal voltage, and a next-stage repeater that uses a signal voltage supplied from the receiver via a second signal line as a normal signal voltage when a normal signal voltage of the gas leak sensor is detected. a normality detection circuit that is relay-connected to the normality detection circuit of the receiver; A repeater for gas leak alarm equipment, characterized in that it is equipped with a termination circuit that outputs to a signal line.