| 摘要 |
An ECU outputs request signals with different identifiers to a communication line one after another in a manner that one of there quest signals is firstly outputted, and each of the other request signals is outputted when the ECU detects a response signal transmitted through the communication line. Each of receivers independently sets a monitoring period of time, receives the request signals from the communication line and performs an identifier setting judgment every request signal. In this judgment, the receiver monitors the communication line during the monitoring period of time starting upon reception of the request signal unless the receiver has outputted a response signal, outputs a response signal to the communication line when the receiver detects no response signal transmitted through the communication line in the monitoring, and sets an identifier included in the request signal when the receiver outputs the response signal.
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