| 摘要 |
PROBLEM TO BE SOLVED: To provide a security system for surely transmitting abnormality detection from an input device to a controller by solving the problem that even when abnormality detection information wirelessly transmitted from the input device can not be received by the controller due to radio disturbance, it can not be detected by the input device, and it is inconvenient in a conventional security system. SOLUTION: In the security system, an input device 1 and a controller 2 are connected through bi-directional radio communication, and when the controller 2 normally receives abnormality detection information from the input device 1, the controller 2 transmits a reception response to the input device 1 being the origin of transmission, and when the input device 1 does not receive any reception response within a fixed time after transmitting the abnormality detection information, the input device 1 retransmits the abnormality detection information. COPYRIGHT: (C)2005,JPO&NCIPI
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