| 摘要 |
PROBLEM TO BE SOLVED: To provide an anti-theft device that can switch on and off a monitoring state for each tag, and issues an alarm when a power supply is interrupted. SOLUTION: The anti-theft device comprises a plurality of tags 2 that function as a sensor attached to an article 1, and a monitoring device 4 to which the tags 2 are connected through a connection cable 3. The monitoring device 4 comprises a microcomputer 12, a sensor input circuit 14 having a plurality of ports 13 to which each tag 2 is connected, and an alarm issuing circuit 15 which issues an alarm. When the microcomputer 12 is started, it stores whether or not the tag 2 is mounted, or the state of the tag 2 at each port 13 of the sensor input circuit 14, stores the port 13 to which the tag 2 is not mounted, or which is in a non-monitoring state, as being in a resting state, sets the port to which the tag 2 is mounted, or which is in a monitoring-enabled state on the monitoring state in response to a signal inputted from the sensor input circuit 14, and drives the alarm issuing circuit 15 at the time of the abnormality of the tag 2 in response to a signal inputted from the sensor input circuit 14. COPYRIGHT: (C)2005,JPO&NCIPI
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