| 摘要 |
PROBLEM TO BE SOLVED: To continue wireless communication without the large deviation of timings with a transmitter-receiver even when each fire detector can not receive prescribed signals from the transmitter-receiver, and to newly establish synchronization with the transmitter-receiver by the reception timing of the prescribed signal when the prescribed signal is received from the transmitter-receiver thereafter. SOLUTION: When a repeater 2 is stopped, each fire detector 3 can not establish the synchronization with the repeater 2 on the basis of the reception timing of transmission request signals. At the time, each fire detector 3 performs a normal operation at a timing by the operation clock of an oscillator 43 in the state of neglecting synchronization establishment performed on the basis of the reception timing of the transmission request signal. Thereafter, the repeater 2 is restored and transmits the transmission request signal to each fire detector 3 by the next super frame. When each fire detector 3 receives the transmission request signal, the synchronization establishment based on the transmission request signal is restarted and a synchronization error during the stop period of the repeater 2 is adjusted. COPYRIGHT: (C)2008,JPO&INPIT
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