| 摘要 |
PURPOSE:To control an input/output device effectively, by transmitting a control signal until the signal reaches a prescribed number of times at a prescribed time interval, when a CPU can not detect the reception signal within a prescribed time due to an interference signal, and monitoring a reception signal. CONSTITUTION:An input/output control section 11 of the CPU 1 and input/output devices 2 transmit various control signals, confirming signals and required data via a bus 3. The CPU 1 starts measurement 126, if no confirming signal is returned from the devices 2 to the bus 3 after the CPU 1 transmits the control signal to the devices 2 via the bus 3. When it is detected 121 that this time reaches a prescribed time, the control signal is retransmitted. Thus, the transmission of the control signal and the monitoring of the reception signal are done until the retransmission reaches a prescribed number of times in a prescribed time interval. Then, the reception signal interfered owing to the generation of a temporary interference signal is transmitted and detected normally. |
