new tractor computer controls

Very interesting. Fire alarm systems have a similar buss
type communication with an EOL, end of line resister. The EOL is located literally at the furthest point. It provides a small supervisory current. If that is lost the computer goes into trouble.
The two wires are isolated from ground so that will also cause a trouble alarm. That can be seen as a voltage difference between one wire and ground, both wires should be the same. Finding an open or grounded wire in a large building can take a long time.
 

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