| 摘要 |
<p>PROBLEM TO BE SOLVED: To keep the stable operation of a system by preventing dropping of line voltage though a receiver calls to plural terminal devices simultaneously in a disaster prevention system. SOLUTION: In the disaster prevention system 1 provided with the plural terminal devices and the receiver 2 for monitoring and controlling these terminal devices, each terminal device has an individual address set individually and a group address set by each prescribed group and is provided with a communication command discriminating circuit 22 for discriminating whether a signal from the receiver 2 is an individual address signal, a group address signal or an entire terminal signal and an energizing display circuit 25. When the circuit 22 discriminates the signal from the receiver 2 to be the individual address signal, each terminal device performs the displaying operation of the circuit 25 immediately. When discriminating the signal to be the group address signal or the entire terminal signal, each terminal device performs displaying operation after the lapse of a delaying time corresponding to the individual address.</p> |
