> How do you deal with the "group commands" ? I.e. how do you
> define, address them? thanks, I still have some doubts about how
> to implement it best in my network

I'm working through a few things with the network wallah. Each PIC
has a unique ID in EEPROM. Either it can be put in at programming
time, in which case I'll add it to the label, or it can be assigned by the
network, meaning the network s/w will have to keep track of where
they are. It's also possible, and probably likely to be added as a feature,
that a general call on the network will make all the PICs respond with
their ID. Perhaps each will respond 100ms * ID after the call, have to
look at the timing at some point. Each station that the group of PICs
is at has an IP address, so the network knows the physical location of
a particular PIC is. The network itself is already well established
 
> And one possible answer to your Prallelizing" is: why don't you
> use MAX485?

Yes, that's a possibilty. One transceiver with enables. I'll have to
check for price on Monday



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