Brent Brown wrote:
> Are you sure about that, or maybe you're getting your wires crossed
> with
> CAN bus? My understanding of RS485 (correct me if I'm wrong) is that
> when transmitting a '1', one line is actively driven high (5V) and
> the other is actively driven low (0V), and the reverse for sending a
> '0'. Nothing passive about it. There will be higher current draw with
> two or more devices attempting to
> drive the bus at the same instant. Transceivers such as the MAX485 are
> current limited and thermally protected.

Yes, you may be right about that.  However the main point is that RS-485 is
a single signal transmitted by a differential pair, and can not be "just
hooked up" to a PIC UART.


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