| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce the time up to a fire alarm emission by plural linked fire alarms while elongating the service life of battery. <P>SOLUTION: A control section 1 of a fire alarm TR located at a fire activates a radio transmission/reception section 2 before a timer completes counting of an intermittent reception interval Tx to transmit a radio signal including an activation message within a transmission period including the cont completion time. On the other hand, immediately after the timer completes the count of the intermittent reception interval Tx and when the control section 1 activates the radio transmission/reception section 2, a fire alarms TR, which is not located at the fire, receives the radio signal including the activation message. That is, in plural fire alarms TR, the timing of completion of the count of the intermittent reception interval Tx is aligned with each other. Since the radio signal including the activation message can be received within one transmission period, the service life of the battery is increased and the time required for activating the linked fire alarms can be reduced. <P>COPYRIGHT: (C)2013,JPO&INPIT |
