| 摘要 |
<p>PURPOSE:To surely detect a hit in any communication equipment with respect to the multiplex communication equipment in which a receiver side communication equipment returns a reply signal representing a reception state of data to a sender side communication equipment so as to detect, the communication state. CONSTITUTION:Plural communication equipments 10 are connected via a common bus line 12. A connector 30 is provided with a circuit setting a withstand voltage of a bus line 12 to be a betaV (>alphaV) when the connector 30 and an ECU 20 are in contact with each other and setting the withstand voltage of the bus line 12 to be reduced to an alphaV when the connector 30 and the ECU 20 are momentarily interrupted. Upon the receipt of data from the bus line 12, the ECU 20 discriminates whether or not reception is implemented normally, and provides an output of a reply signal whose peak level is a betaV when the data reception is normal and an output of a reply signal whose peak level is a 0V when the data reception is not normal. A communication equipment sending data discriminates the communication state depending on a peak level of the received reply signal.</p> |
