| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a security system capable of distinguishing the moving direction of a family member carrying a responder and performing control according to the moving direction. <P>SOLUTION: The security system comprises a responder TG with specific individual identification information set therein, and an interrogator RW for acquiring the identification information through wireless communication with the responder TG. The interrogator RW comprises two LF transmitters 8a, 8b, and the respective LF transmitters 8a, 8b are arranged so that their respective communication areas may not overlap each other along a path outside a door, and transmit interrogation signals including their own ID number respectively. In a controller 5 of the responder TG, only when a plurality of interrogation signals respectively with a different ID number are received by an LF receiver 2 within a predetermined time frame, information indicative of all the received ID numbers and the ID number receiving order is transmitted from an RF transmitter 1 together with its own identification information. <P>COPYRIGHT: (C)2007,JPO&INPIT |
