Automobile Electrical and Electronic Systems, 5th Edition

Electrical systems and circuits

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assembly, and these in turn will make a connection between the power ring

main and the lights. The events are similar to turn off the lights, except that the

code placed on the data bus will be different and will be recognized only by the

appropriate receivers as an off code.

3.3.2 Multiplex data bus

In order to transmit different data on one line, a number of criteria must be

carefully dened and agreed. This is known as the communications protocol.

Some of the variables that must be dened are as follows:

• Method of addressing.

• Transmission sequence.

• Control signals.

• Error detection.

• Error treatment. ...