| 摘要 |
PROBLEM TO BE SOLVED: To allow a remote operation to simply and easily control a power supply to a disaster prevention instrument such as a fire sensor and the like to be operative by a battery power.SOLUTION: A fire sensing device 10 operating by a battery power 28 as a disaster prevention instrument comprises: a radio tag 30; a sensing device control unit 12; an instrument circuit unit 14; and a power switch unit 26. An external operation device 100 is configured to transmit a telegraphic message to the radio tag 30 of the fire sensing device 10, and store power injection information and power shut-off information. When reading the power injection information from the radio tag 30 in a state where the power switch unit 26 is turned off, the sensing device control unit 12 is configured to implement a turn-on control of the power switch unit 26 to control the sensing device. Furthermore, when reading the power shut-off information from the radio tag 30 in a state where the power switch unit 26 is turned on, the sensing device control unit 12 is configured to implement a turn-off control of the power switch unit 26, and transit to an operation having a sleep mode of low power consumption set.SELECTED DRAWING: Figure 2 |
