| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a locking apparatus which at least can be unlocked in a fashion being out of contact therewith, and has its key device prevented from being illegally copied, and to provide a writing apparatus for use therein. SOLUTION: When an operating button 21 of the key device 10 is operated, the key device 10 outputs a calling code from a light emitting portion 23. Upon reception of the calling code, a lock control device 11 outputs 99 random responsive codes and a single responsive code inherent in the locking apparatus of this group. The location of the inherent code is determined by random numbers. Therefore, it is not easy for an outsider to know which is the inherent code in this locking apparatus. When the inherent code is output, the key device 10 receives the code, and generates and outputs a recognizing code S. Upon reception of the recognizing code S, the lock control device 11 unlocks a door 1 if the recognizing code is a correct one. On the other hand, if the lock control device 11 receives an erroneous recognizing code or it does not receive any response, it notifies a host computer 15 of the erroneous response or no response.</p> |
