| 摘要 |
PROBLEM TO BE SOLVED: To prevent an inappropriate act before it happens by detecting an improper invasion of command data immediately by an easy arrangement of algorithm for transmission. SOLUTION: Algorithm to count the number of times of transmission and to transmit the same command data for N successive times at an appropriate timing when a main control board 150 produces command data and transmits them to a discharge control board 152 is provided. Algorithm to count receiving times at the discharge control board 152 and to determine if it receives the same command data for N successive times concurrent with the appropriate timing for the main control board 150 by synchronizing with the algorithm at the main control board 150 is provided. If a peculiar command data enters, the command data is considered not to be received for N successive times since the time for transmitting and the time for receiving hardly match. This is determined as an inappropriate act and is processed as an error. COPYRIGHT: (C)2003,JPO
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