| 摘要 |
A data transfer system is provided for preventing a slave device from operating erroneously or running out of control upon resuming communication after communication is interrupted due to the occurrence of abnormal circumstances such as a power failure and the like. A master device transmits a stop condition to the slave device for terminating communication and performs a power failure-processing task when abnormal circumstances such as a power failure or a momentary power failure occurs. The master device transmits a stop condition for terminating communication upon either the occurrence of abnormal circumstances or the resumption of communication subsequent to the recovery of the abnormal circumstances, and transmits a start condition for reestablishing communication after transmitting a stop condition to the slave device. The slave device terminates communication upon receipt of either stop condition and reestablishes communication upon receipt of a start condition.
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