| 摘要 |
PURPOSE: A circuit for checking transmission and reception states is provided to easily check a communication state of a communication interface, i.e., the transmission and reception states, without a separate external check device. CONSTITUTION: An itself diagnosis control unit(20) does not transmit a transmission signal, which is outputted a transmission unit of a communication interface(10), to the outside, and transmits the transmission signal to a reception unit of the communication interface(10) by a communication control signal. The itself diagnosis control unit(20) checks transmission and reception states between the transmission unit and the reception unit of the communication interface(10). |
