> The most popular hardware interface for multidrop serial is EIA485 (also known
> as RS485). It's cheap and reliable. However there's no specified protocol that
> sits on top of it to talk to each of the individual PIC nodes. So you'll have
> to fish around for ways of doing it.

We're working on it.

http://enerd.ws/robots/robin/
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D. Jay Newman           ! DCX - it takes off and lands base first,
jay@sprucegrove.com     !       as God and Robert Heinlein intended.
http://enerd.ws/robots/ !

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