| 摘要 |
A control apparatus to which plural power devices are connected via a communication line. The power devices send data indicating a self-diagnostic result to the control apparatus by serial communications via the communication line. A CPU ignores serial communication data when a low-voltage detection circuit detects an abnormal drop in power source voltage. A period for ignoring data is set to time at which a completion of serial communication with all the power devices is determined by counting the number of communications by a counter. Even in case where an influence by the drop in power source voltage remains after recovery of the power source voltage due to communication delay, data that may includes abnormality is ignored and only self-diagnostic data with high reliability is used.
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