Vehicle communications transceiver with loop-back diagnostic mod

Details Vehicle communications transceiver with loop-back diagnostic mod Vehicle communications transceiver with loop-back diagnostic mod

1995-06-06

2000-02-29

Ton, Dang

Multiplex communications

Diagnostic testing

Loopback

H04J 116

Patent

active

060318236

ABSTRACT:
A vehicle communications network is provided which includes a ground translation circuit and interfacing transmitter circuits that achieve smooth current sourcing transitions. Included is a communications bus such as a J1850 having multiple-access for interfacing with a plurality of electronics, preferably within a vehicle. Each transceiver has a transmitter and receiver interfaced with the bus. The transceiver is coupled via a resistive element to the communications bus and sources current onto the bus when the transmitter output voltage exceeds the bus voltage. The added resistance advantageously reduces changes in current which may otherwise exist on the communications bus when current sourcing switches on and off.

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Henry W. Ott, "Noise Reduction Techniques in Electronic Systems" Second Edition, 1988, pp. 37-42.

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