| 摘要 |
PURPOSE:To provide a disaster preventing system capable of sending a fault such as a disconnection between a sensor and a radio transmitter in the case of arranging the radio transmitter and a radio receiving repeater for repeating an alarm signal from the sensor to a fire receiver. CONSTITUTION:The radio receiving repeater 10 is provided with an L-C line terminal connected to the fire receiver 3 and fault detecting terminals OMEGAL, OMEGAC, etc., and a fault detecting resistor R2 is connected to the terminals OMEGAL, OMEGAC. If a CPU 11 opens a relay contact (ta) when a radio receive 22 does not receive periodical information from a radio transmitter 21 in a normal state, when a signal indicating a defective connection state with the sensor 1 is received, or when the CPU 11 detects the voltage drop of an auxiliary battery, the resistor R2 is disconnected from the L-C line, a disconnected state is generated in the receiver 3 and the receiver 3 detects the fault.
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