| 摘要 |
PROBLEM TO BE SOLVED: To prevent an illegal increase in the credits of tokens by the insertion of an illegal gadget into a token selector. SOLUTION: In a sub control board 30, a CPU 220 executes an arithmetic processing according to a program stored in a memory part 223 for judging abnormality to record the time for starting or ending the reception per round of reception into a RAM of the memory part 223 for judging abnormality while a token reception command signal is received given times from the main control board 20 and the time intervals are calculated between the rounds of reception about the time recorded and when the time intervals calculated are found in continuity within prescribed errors in the time series sequence, the occurrence of abnormality is assumed. This can prevent an illegal increase in the credits of tokens by the insertion of the illegal gadget into the token selector. COPYRIGHT: (C)2007,JPO&INPIT
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