| 摘要 |
PROBLEM TO BE SOLVED: To provide a wireless fire alarm system capable of suppressing consumption of a battery when a fire sensor is newly registered or synchronized again. SOLUTION: In the wireless fire alarm system, the fire sensor 6 transmits a synchronization request signal for requesting synchronization information required to be synchronized with a receiver 1 and the receiver 1 immediately transmits a synchronization reply signal including the number of time slots to the head time slot B of the next super frame SF to the sire sensor 6 irrespective of a time slot position when the synchronization request signal from the fire sensor 6 is received. Then, the head slot B of the next super frame SF is surely received and synchronized with the receiver 1 by receiving two slots of the number of time slots after counting in the fire sensor 6. At this time, power supply to a radio receiving part is stopped from reception of the synchronization reply signal of the receiver 1 to reception of the two slots and the consumption of the battery is suppressed. COPYRIGHT: (C)2008,JPO&INPIT
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