| 摘要 |
PURPOSE:To avoid reception of a signal from a transmission unit after specified time has elapsed to prevent trouble by providing a means for enabling reception of the arming signal from the transmission unit within said specified time since a door is closed. CONSTITUTION:A security device body 2 is equipped with an arming reception monitor 24 wherein a door from opening to closing is monitored based on an output of a door opening/closing sensor 31. When the door is closed, a reception signal RPS is set at high level to enable arming and time counting is started at the same time. After specified time has elapsed since time counting was started, the reception signal RPS is set at low level to disable arming. On the other hand, a security controller 25 refers to the level of the reception signal RPS, and when it certified that arming is enabled, it enters into a security operation state to have a burglar alarming unit 4 operated when unusualness occurs. After the above specified time has elapsed, the signal is not received even if a transmission unit 1 misoperates, so that trouble may be prevented. |
