| 摘要 |
PROBLEM TO BE SOLVED: To extend a remaining time to battery shutoff as much as possible to enhance reliability even if a low battery alarm is given. SOLUTION: When a low battery monitoring part 60 detects a low battery from a voltage drop of a battery power supply 40, the alarm outputs the low battery alarm indicating an interlocking source by a notification part 36, stops the transmission operation of an event signal to the other alarm by a transmission circuit 42 and reception operation for receiving an event signal from the other alarm by a reception circuit, and reduces the current consumption of the battery power supply 40. COPYRIGHT: (C)2011,JPO&INPIT
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