| 摘要 |
PROBLEM TO BE SOLVED: To improve the reliability of the alarm system by informing a user and a terminal device of communication abnormality in such a case. SOLUTION: This system consists of an alarm means 1 which detects a leak of gas, etc., and outputs a control signal by radio, and also receives a monitor signal, a meter means 2 which receives the control signal to cut off the supply of gas, etc., and sends a monitor signal indicating the cutoff state by radio, and a network control means 4 which receives the control signal and monitor signal and informs a center device 6 of them, and also transfers the control signal from the center device 6 to the meter means 2. Then an alarm means 1 sends a state information signal showing its operation state to the network control means 4 at specific intervals. Consequently, the center device 6 can confirm the inspection of the alarm means 1 through the network control means 4. |
