On Thu, 12 Jun 2003 09:12:56 +0100, you wrote:
>Looking at the CAN driver schematics I can see why Peter thinks they may=
 be
>a single ended system. It would appear that they are not a "true
>differential" drive with one side going to both positive and negative
>voltages. The driver chip has a transistor which pulls the CANH line to
>positive, and another to pull the CANL line to ground, but it looks like=
 the
>"other" state is open circuit. It would seem the receiver is a true
>differential item with the threshold set high enough to minimise =
receiving
>any noise.
>
I'm using some TI CAN transceivers on a network here. The idle state
is both lines at 2.5 volts (5V bus). For the active state one line goes
to 1.5 volts and the other 3.5 volts.

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