JPH07110893A - Communication system - Google Patents

Abstract

PURPOSE:To reduce current consumption by allowing a receiver to intermittently monitor a control signal transmitted from a transmitter and intermittently turned on after receiving the control signal. CONSTITUTION:Since the transmitter transmits an intermittent signal S12 to be turned on for X sec and turned off for Y sec to the receiver at the time of receiving an abnormal state detecting signal sent from a gas detector, the current consumption of the transmitter can be suppressed to a low level. On the other hand, the receiver monitors the signal S12 sent from the transmitter at the interval of time T2, and when the signal S12 is ON at received input check timing, monitors the signal S12 continuously for regulated time T3. When the signal S12 is transmitted during the period of the time T3, the receiver sends a control signal S15 to a microcomputer meter. At the time of receiving the signal S15, the microcomputer meter executes processing such as the interruption of gas. Since the signal S12 is intermittently monitored for (X + Y) sec, the current consumption of the receiver can be suppressed to a low level.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication system for notifying a microcomputer meter of an abnormal situation such as a gas leak.

[0002]

2. Description of the Related Art When an abnormal situation such as a gas leak occurs,
As a communication system for notifying a terminal device such as a microcomputer meter of occurrence of an abnormal situation and performing processing such as gas shutoff, there is one as shown in FIG.

The communication system shown in FIG. 4 has a gas detector 10
1, transmitter 103, receiver 105, microcomputer meter 10
Have 7. FIG. 5 is a waveform diagram of signals at various parts of this communication system.

When the gas detector 101 detects an abnormal situation such as a gas leak, it sends a signal S1 that is turned on to the transmitter 103. When the signal S1 sent from the gas detector 101 is turned on, the transmitter 103 outputs a signal S2 which is turned on to the receiver 10
Send to 5. When the signal S1 continues for a specified time, the transmitter 103 regards the gas detector 101 as normal operation and instantaneously interrupts the signal S2.

The receiver 105 performs an intermittent operation in order to reduce the current consumption. In order to perform reception input timing check at intervals of time T2, signal S4 is used as a reference, and signal S4 is used as a reference.
The signal S2 at the moment when is turned on is monitored. That is, the signal S2 output from the transmitter 103 is monitored at intervals of time T2, and if the signal S2 is on at the reception input check timing, the reception state is entered from that moment and the signal S3 is turned on. When the signal S2 is momentarily turned off, the control signal S5 is sent to the microcomputer meter 107 which is a terminal. When the control signal S5 is turned on, the microcomputer meter 107 performs processing such as shutting off gas.

[0006]

However, in such a conventional communication system, since the transmitter 103 continuously transmits the signal S2 to the receiver 105,
There is a problem that the current consumption increases. Further, regarding the receiver 105, once the signal S3 is turned on, there is a problem that the current consumption increases because the signal S2 is in a receiving state until it is momentarily turned off.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a communication system with low current consumption.

[0008]

In order to achieve the above-mentioned object, the present invention provides a detector which outputs an abnormal situation detection signal when an abnormal situation is detected, and an X state when the abnormal situation detection signal is issued from the detector. A transmitter that repeatedly transmits a first control signal that is turned on for 2 seconds and turned off for Y seconds, and is turned on intermittently at a predetermined time interval and receives the first control signal from the transmitter when turned on If yes, (X + Y)
A receiver for monitoring the first control signal at an interval of a second and sending the second control signal to the terminal device when the first control signal is received after a lapse of a certain time. It is a communication system.

[0009]

In the present invention, since the control signal sent from the transmitter is a signal which is turned on intermittently, the current consumption of the transmitter can be reduced. Since the receiver intermittently monitors the first control signal after receiving the control signal sent from the transmitter, the current consumption can be reduced.

[0010]

Embodiments of the present invention will now be described in detail with reference to the drawings. The communication system according to this embodiment has the same configuration as that shown in FIG. FIG. 1 is a block diagram showing a configuration of a transmitter 1 according to an embodiment of the present invention. The transmitter 1 includes a discrimination circuit 3, a control circuit 5, a clock circuit 7, a power supply control circuit 9, a power supply 11, and a transmission circuit. 13 and an antenna 15.

The discrimination circuit 3 activates the control circuit 5 when an abnormal situation detection signal is sent from the gas detector. Control circuit 5
Controls the clock circuit 7 to activate the power supply control circuit 9 for X seconds and then stop it for Y seconds. The power supply 11 is activated by the power supply control circuit 9 for X seconds and then stopped for Y seconds. The transmission circuit 13 is activated by the power source 11
The antenna 15 sends a signal that is on for 2 seconds and off for Y seconds.
To the receiver 21 via.

FIG. 2 is a block diagram showing the configuration of the receiver 21. The receiver 21 includes an antenna 23, a receiving circuit 25,
It has a reception detection circuit 27, a control circuit 29, a clock circuit 31, a power supply control circuit 33, a power supply 35, and an output circuit 37.

The clock circuit 31 has a power supply control circuit 3 at a constant cycle.
Start 3. The power supply control circuit 33 activates the power supply 35 each time the clock circuit 31 prompts the activation. Receiving circuit 25
Is activated by the power supply 35 and receives the signal sent from the transmitter 1 via the antenna 23. Reception detection circuit 27
Analyzes the message sent from the transmitter 1, and if the message is the desired message, it controls the control circuit 29 to stop the power supply 35 for (X + Y) seconds. The output circuit 37 sends a signal instructing the microcomputer meter to shut off or the like.

Next, the operation of this communication system will be described with reference to FIG. FIG. 3 is a waveform diagram of signals at various parts in this communication system. When the gas detector detects an abnormality, the signal S11 is turned on, and this signal S11 is sent to the transmitter 1. In the transmitter 1, when the signal S11 is sent, the discrimination circuit 3 activates the control circuit 5, and the control circuit 5
The clock circuit 7 is controlled by the power source 11 and the power supply 11 is turned on for X seconds and turned off for Y seconds. Therefore, the signal S12 that is on for X seconds and off for Y seconds is transmitted from the transmission circuit 13 to the receiver 21.

In the receiver 21, the clock circuit 31 has a constant interval T.
In step 2, the power supply control circuit 33 is activated, and the power supply 35 activates the reception circuit 25 every time the power supply control circuit 33 is activated. At the moment when the receiving circuit 25 is activated (time t1), the transmitter 1
If the signal S12 sent from is on, the reception detection circuit 27 analyzes the received message, and if it is the target message, the control circuit 29 stops the power supply 35 for (X + Y) seconds.

After (X + Y) seconds have elapsed, the clock circuit 1 is powered by the power source 3
5 is started, and the receiving operation is started again. In this way, the signal S12 is monitored at intervals of (X + Y) seconds from the time t1, and after the elapse of a predetermined time T3, the signal S12 sent from the transmitter 1 is monitored.
When is on, the signal S15 is sent from the output circuit 37 to the microcomputer meter. Upon receiving the signal S15, the micom meter performs processing such as shutting off gas.

As described above, in the present embodiment, when the transmitter 1 receives the abnormal situation detection signal sent from the gas detector, X
Intermittent signal S12 that is on for seconds and off for Y seconds
Is sent to the receiver 21, the current consumption of the transmitter 1 can be kept low.

On the other hand, the receiver 21 monitors the signal S12 sent from the transmitter 1 at intervals of time T2. If the signal S12 is on at the reception input check timing, the signal S12 is maintained for the specified time T3. Is continuously monitored, and if the signal S12 is being sent during the specified time T3, the control signal is sent to the microcomputer meter. In this case, the signal S12
Is intermittently performed at intervals of (X + Y) seconds, so that the current consumption of the receiver 21 can be kept low.

In this embodiment, an example of communication between the gas detector and the gas microcomputer meter is taken, but the present invention can be widely applied to other communication systems.

[0020]

As described above in detail, according to the present invention, current consumption can be reduced.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a transmitter 1 according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a receiver 21.

FIG. 3 is a waveform diagram of each part of the communication system according to the present embodiment.

FIG. 4 is a schematic configuration diagram of a communication system.

FIG. 5 is a waveform diagram of each part in the conventional communication system.

[Explanation of symbols]

 1 ... Transmitter 3 ... Discrimination circuit 5 ... Control circuit 7 ... Clock circuit 9 ... Power supply control circuit 11 ... Power supply 13 ... Transmission circuit 15 ... Antenna 21 ... … Receiver 23 ……… Antenna 25 ……… Receive circuit 27 ……… Reception detection circuit 29 ……… Control circuit 31 ……… Clock circuit 33 ……… Power supply control circuit 35 ……… Power supply 37 ……… Output circuit

Claims (1)

[Claims] 1. A detector that emits an abnormal situation detection signal when an abnormal situation is detected, and a first control signal that is turned on for X seconds and turned off for Y seconds when the abnormal situation detection signal is issued from the detector is repeatedly transmitted. And the transmitter that is turned on intermittently at a predetermined time interval and receives the first control signal from the transmitter when turned on, the first control is performed at intervals of (X + Y) seconds. Monitor the signal,
A communication system comprising: a receiver that sends a second control signal to the terminal device when the first control signal is received after a lapse of a certain time.