| CPC H04L 12/40032 (2013.01) [H03K 17/6871 (2013.01); H04L 12/40045 (2013.01); H04L 41/0668 (2013.01); H04L 2012/40215 (2013.01); H04L 2012/40273 (2013.01)] | 18 Claims |
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1. An electronic component in a vehicle comprising:
a bus transceiver having a pair of transceiver output terminals adapted to be coupled to a multi-wire multiplex bus, wherein the multiplex bus transmits multiplex messages in the vehicle as complementary signals;
a DC power input terminal adapted to be coupled to a power line supplying DC electrical power to a plurality of electronic modules in the vehicle;
a subtractor generating a single-ended difference signal according to a voltage difference between the pair of transceiver output terminals;
a balanced signal generator having a single input adapted to receive an alternating component of a voltage at the power input terminal, wherein the balanced signal generator has a pair of balanced outputs providing a differential signal to the transceiver output terminals according to a remote difference signal transmitted to the power line by one of the plurality of electronic modules;
a first switch adapted to selectably couple the single-ended difference signal from the subtractor to the power input terminal when in a conductive state;
a second switch adapted to selectably couple the single input of the balanced signal generator to the power input terminal when in a conductive state; and
a controller configured to 1) detect a fault associated with the multiplex bus, 2) switch the first and second switches into the conductive states when the fault is detected, and 3) otherwise switch the first and second switches out of the conductive states;
whereby when the fault is detected then the multiplex messages are transmitted on the power line with an unaltered message frame.
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