| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an apparatus control system strong against security, and correctly recognizing control data from a normal portable unit. <P>SOLUTION: The portable unit 10 transmits the control data generated on the basis of an ID code for specifying oneself and a timer code updated every time of the transmission. A master machine 20 outputs an operation command signal to a security device from a security control part 27 when determining that the ID code and the timer code included in the received control data are correct by an ID code comparing part 23 and a timer code comparing part 24. When the timer code is not correct, its timer code is stored in a comparing timer code storage part 26, and is compared with a this time-received timer code stored in its comparing timer code storage part in the next reception, to determine whether or not to be in the correct relationship. Thus, even if the portable unit side timer code largely advances, its code is determined as correct by reception of second time. <P>COPYRIGHT: (C)2008,JPO&INPIT |
