SECURITY CONTROL DEVICE, PORTABLE MACHINE AND SECURITY CONTROL SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a security device capable of restraining the occurrence of communication failure caused by disturbance such as noise, while restraining an increase in electric power consumption.

SOLUTION: This security control device 20 has a receiving part 23 constituted so as to receive a response signal, by selectively becoming a reception standby state from a plurality of kinds of reception frequencies set equal to a transmission frequency of various response signals transmitted from a portable machine 10. The security control device 20 also has a communication control part 21 for transmitting a channel change signal for changing the transmission frequency of the various response signals on condition of releasing preset security by manual operation and changing and controlling the reception frequency of the receiving part 23 to the same frequency as the transmission frequency of the portable machine 10 changed by its channel change signal.

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