| 摘要 |
PROBLEM TO BE SOLVED: To provide an easy-to-use fire alarm system in which a larger number of relays than the number of frequency channels can be used. SOLUTION: The system has a plurality of relays 2 for relaying fire sensing data obtained by receiving wireless signals transmitted from a plurality of fire sensors 1 that sense fire, to a monitoring panel 3 connected through a transmission line Ls. The time division multiplex time slots used by the fire sensors 1 for sending wireless signals to the relays 2 are allotted so that they do not overlap each other for the plurality of the relays 2 using the same frequency channel. Thereby, a larger number of the relays 2 than the number of the frequency channels can be used. In comparison with the case where the time slots used overlap each other, there are fewer restrictions concerning the positions of the fire sensors 1, thereby improving usability. COPYRIGHT: (C)2008,JPO&INPIT
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