| 摘要 |
The diagnostic apparatus for diagnosing communication apparatuses connected thereto. The diagnostic apparatus periodically monitors a control data sent from the communication apparatuses and determines a communication apparatus to be diagnosed based on the monitoring result. The diagnostic apparatus is adapted to transmit a plurality of test signals to the communication apparatus to be diagnosed and the communication apparatus returns a response signal to the diagnostic apparatus as an acknowledge corresponding to the test signal. The diagnostic apparatus determines whether or not the response signal corresponding to the test signal is received within a predetermined period. The diagnostic apparatus diagnose whether or not a communication error occurs between the diagnostic apparatus and the communication apparatus based on the determining results.
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