JPH07147567A - Radio communication system - Google Patents

Abstract

PURPOSE:To obtain the radio communication system with high reliability by checking automatically a fault of the radio communication system itself. CONSTITUTION:A transmitter 3 generates a check signal from a timer circuit 11 at a specified time interval, modulates the signal at a modulation transmission circuit 15 and the modulated signal is sent as a radio wave. A receiver 5 receives and demodulates the radio wave and when a text information analysis circuit 25 detects the signal to be a check signal, a check timer circuit 27 is reset. When a fault takes place in the communication system itself, the receiver 5 cannot receive the check signal. Thus, the check timer circuit 27 is not reset within a specified time and the check timer circuit 27 sends a signal representing a communication fault to a terminal equipment 7 via a terminal equipment control circuit 29 and the terminal equipment 7 makes operation of the safety side such as interruption of gas supply.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless communication system used for gas microcomputer meters and the like.

[0002]

2. Description of the Related Art Conventionally, there is a wireless communication system in which a gas leak detector is installed in a house, and when there is a gas leak, an abnormality is reported to a gas microcomputer meter outdoors to shut off the gas.

FIG. 5 is a schematic configuration diagram of such a wireless communication system. This wireless communication system includes a detector 101,
It is composed of a transmitter 103, a receiver 105, and a terminal 107. The detector 101 is installed indoors, detects that a gas leak has occurred, and notifies the transmitter 103 of this. Transmitter 103
Informs the receiver 105 of the occurrence of an abnormal situation by a wireless signal.
When the receiver 105 receives the wireless signal sent from the transmitter 103, it sends a control signal to a terminal 107 such as a gas microcomputer meter, and when the control signal is sent, the terminal 107 shuts off the gas.

FIG. 6 is a block diagram showing the configuration of the transmitting side of FIG. 5, and FIG. 7 is a block diagram showing the configuration of the receiving side.

As shown in FIG. 6, the transmitter 103 includes an antenna 107, a signal detection circuit 109, and a message information setting circuit 11.
1, a modulation transmission circuit 113, and a power supply circuit 115. When the detector 101 detects an abnormal situation (gas leak), the signal detection circuit 109 detects an abnormal situation occurrence signal sent from the detector 101 and transmits it to the electronic message information setting circuit 111. The telegram information setting circuit 111 creates a telegram that informs that an abnormal situation has occurred (gas leakage has occurred), and the modulation transmission circuit 113 modulates this telegram and an abnormal situation occurrence signal is transmitted from the antenna 107 by radio waves. The power supply circuit 115 supplies power to the signal detection circuit 109, the message information setting circuit 111, and the modulation transmission circuit 113.

As shown in FIG. 7, the receiver 105 includes an antenna 117, a reception demodulation circuit 119, and a telegram information analysis circuit 12.
1, a terminal control circuit 123, and a power supply circuit 125. The reception demodulation circuit 119 demodulates the radio wave received by the antenna 117, and the telegram information analysis circuit 121 analyzes the telegram contents.
The terminal control circuit 123 outputs a control signal to the terminal 107 according to the content of the electronic message. That is, a control signal requesting gas shutoff or the like is output to the terminal 107 such as a gas microcomputer meter.

[0007]

However, in such a wireless communication system, the causes such as the failure of the transmitter 3 and the receiver 5 and the deterioration of the spatial condition of the wireless communication section between the transmitter 3 and the receiver 5 are caused. Therefore, the abnormal situation occurrence signal of the detector 101 may not be transmitted to the terminal 107. That is, when a communication failure occurs in the wireless communication system, even if the detector 101 detects an abnormal situation, the terminal 107 does not shut off the gas.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a highly reliable wireless communication system capable of automatically checking the abnormality of the wireless communication system itself. It is in.

[0009]

In order to achieve the above-mentioned object, the present invention provides a detector for detecting an abnormal situation, and a transmitter for transmitting an abnormal situation occurrence signal when the detector detects an abnormal situation, In a wireless communication system comprising a receiver for receiving the abnormal situation occurrence signal, and a terminal device controlled by a control signal sent from the receiver,
The transmitter has means for sending a check signal at a predetermined interval, and the receiver has means for sending a signal indicating a communication error to the terminal device when the check signal cannot be received at a predetermined interval. It is a wireless communication system characterized by

[0010]

According to the present invention, the transmitter sends a check signal at a predetermined interval, and if the receiver cannot receive the check signal at a predetermined interval, it sends a signal indicating a communication error to the terminal device.

[0011]

Embodiments of the present invention will now be described in detail with reference to the drawings. The schematic configuration of the wireless communication system according to the present embodiment is similar to that shown in FIG. A wireless communication system having a gas leak detector and a gas microcomputer meter as a terminal will be described below.

FIG. 1 is a block diagram showing the configuration of the transmitting side of a wireless communication system according to an embodiment of the present invention. When the detector 1 detects a gas leak, it sends an abnormal situation occurrence signal to the transmitter 3. The transmitter 3 has a signal detection circuit 9, a timer circuit 11, a message information setting circuit 13, a modulation transmission circuit 15, a power supply circuit 17, and an antenna 19. Signal detection circuit 9
When the abnormal situation occurrence signal sent from the detector 1 is detected, the electronic message information setting circuit 13 causes the electronic statement information setting circuit 13 to create an electronic statement indicating the occurrence of the abnormal situation. The modulation transmission circuit 15 modulates this message and the abnormal situation occurrence signal is transmitted from the antenna 19 as a radio wave. The timer circuit 11 emits a signal at a certain prescribed time interval, and the electronic message information setting circuit 13 creates a check signal upon receipt of this signal, and the modulation transmission circuit 1
The check signal is modulated by 5 and transmitted from the antenna 19. That is, a check signal is sent from the transmitter 3 to the receiver 5 at a certain specified time interval. Power supply circuit 17
Supplies power to the signal detection circuit 9, the timer circuit 11, the message information setting circuit 13, and the modulation transmission circuit 15.

FIG. 2 is a block diagram showing the configuration of the receiving side of the wireless communication system. The receiver 5 includes an antenna 21, a reception demodulation circuit 23, a message information analysis circuit 25, a check timer circuit 27, a terminal control circuit 29, and a power supply circuit 31.

The reception demodulation circuit 23 demodulates the radio wave signal received by the antenna 21. The telegram information analysis circuit 25 analyzes the telegram contents of the demodulated signal, and if it is an abnormal situation occurrence signal, it sends an abnormal situation occurrence signal to the terminal control circuit 29, and the terminal control circuit 29 shuts off the gas to the terminal 7. Send control signal of.

Further, the electronic message information analysis circuit 25 is a demodulation circuit 23.
If the signal sent from is a check signal, the check timer circuit 27 is reset. The check timer circuit 27 is reset by the electronic message information analysis circuit 25. If the check timer circuit 27 is not reset even after the stipulated time is exceeded, a signal indicating that wireless communication cannot be normally performed (communication abnormality) is sent to the terminal control circuit 29. . The terminal control circuit 29 transmits this signal to the terminal 7. Next, the general operation of this embodiment will be described. FIG. 3 and FIG. 4 are waveform charts of signals of respective parts in a state where normal wireless communication is possible between the transmitter 3 and the receiver 5. When the detector 1 detects an abnormal situation such as a gas leak, it outputs a signal as shown in FIG. The signal detection circuit 9 detects the signal sent from the detector 1, and the electronic message information setting circuit 13 creates an electronic message indicating that an abnormal situation has occurred.
The electronic message is modulated by the modulation transmission circuit 15 and transmitted from the antenna 19 as a radio wave.

The reception demodulation circuit 23 of the receiver 5 is the antenna 2
The radio signal received in 1 is demodulated, and the transmitted message is obtained (FIG. 3 (b)). The electronic message information analysis circuit 25 analyzes the electronic message content, and when the electronic message content is abnormal, the terminal control circuit 29 sends a control signal requesting gas shutoff to the terminal 7 (FIG. 3 (c)). The gas is cut off at the terminal 7.
In the transmitter 3, the timer circuit 11 creates a check signal at a certain specified time interval (FIG. 4 (a)), and the telegram information setting circuit 13 electronically outputs the check signal (see FIG. 4).
(B)), via the modulation transmission circuit 15 and the antenna 19,
This check signal is transmitted as a radio wave to the receiver side.

In the receiver 5, the reception demodulation circuit 23 demodulates the reception signal (FIG. 4 (c)), the telegram information analysis circuit 25 analyzes the contents of the telegram, and if it is a check signal, the telegram information analysis circuit 25. Sends a reset signal to the check timer circuit 27 (FIG. 4 (d)). The check timer circuit 27 is reset when a reset signal is sent.

When the reset signal is sent from the electronic message information analysis circuit 25 within the specified time, the check timer circuit 27 does not send a signal indicating communication abnormality to the terminal control circuit 29.

Due to the failure of the transmitter 3, the failure of the reception demodulation circuit 23 in the receiver 5, the deterioration of the spatial condition of the wireless communication section between the transmitter 3 and the receiver 5, and the like, the transmitter 3 and the receiver 5 are affected. If normal wireless communication cannot be performed between them, the check signal generated by the timer circuit 11 will not reach the receiver 5. Therefore, since the check timer circuit 27 is not reset within the specified time, the check timer circuit 27 sends a signal indicating communication abnormality to the terminal 7 via the terminal control circuit 29. The terminal 7 performs a safe operation such as shutting off a valve through which gas passes when a signal indicating communication abnormality is sent.

As described above, in this wireless communication system, the transmitter 3 and the receiver 5 are out of order, and the transmitter 3 and the receiver 5 are broken.
When normal wireless communication cannot be performed due to deterioration of the spatial condition in the wireless communication section between the two, a signal indicating communication abnormality is sent to the terminal 7, the gas flow is cut off, and the user performs wireless communication. You can know the abnormal operation of the system. Conventionally, the user and the administrator of the wireless communication system have confirmed the normal operation state of the system by regularly performing the periodic inspection for confirming the normality of the wireless communication. If a communication system is used, this inspection work can be omitted. Further, since the operation check of the wireless communication system is constantly performed, the reliability of the wireless communication system can be improved.

In the above description, the detector 1 is a gas detector and the terminal 7 is a gas microcomputer meter. However, the present invention is not limited to such gas auxiliary equipment.
It is also widely applied to other wireless communication systems.

[0022]

As described above in detail, according to the present invention, it is possible to automatically check the abnormality of the wireless communication system itself and provide a highly reliable wireless communication system.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a transmitting side of a wireless communication system according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a receiving side of a wireless communication system according to an embodiment of the present invention.

FIG. 3 is a waveform diagram of signals at various parts.

FIG. 4 is a waveform diagram of signals at various parts.

FIG. 5 is a schematic configuration diagram of a wireless communication system.

FIG. 6 is a block diagram showing a configuration of a transmitting side of a conventional wireless communication system.

FIG. 7 is a block diagram showing a configuration of a receiving side of a conventional wireless communication system.

[Explanation of symbols]

 1 ………… Sensor 3 ………… Transmitter 5 ………… Receiver 7 ………… Terminal 9 ………… Signal detection circuit 11 ………… Timer circuit 13 ………… Telegram information setting circuit 15 ………… Modulation transmission Circuit 17 ... Power supply circuit 19, 21 ... Antenna 23 ... Reception / demodulation circuit 25 ... Telegram information analysis circuit 27 ... Check timer circuit 29 ... Terminal control circuit 31 ... Power supply circuit

Claims (2)

[Claims] 1. A detector for detecting an abnormal situation, a transmitter for transmitting an abnormal situation occurrence signal when the detector detects an abnormal situation, a receiver for receiving the abnormal situation occurrence signal, and a receiver for receiving the abnormal situation occurrence signal. In a wireless communication system comprising: a terminal device controlled by a control signal sent, the transmitter has means for sending a check signal at a predetermined interval, and the receiver cannot receive the check signal at a predetermined interval. In this case, the wireless communication system is provided with means for transmitting a signal indicating communication abnormality to the terminal device. 2. The wireless communication system according to claim 1, wherein the detector detects a gas leak, and the terminal device closes a valve for passing gas by a signal indicating the communication abnormality for safety.