Hello Nelson,

Friday, August 16, 2002, 9:56:46 PM, ste napisali:

Nelson> I am planning a system with a network of PICs.  The PICs will be daisy
Nelson> chained together (power and communications) in a standard office environment
Nelson> (fluorescent lights, networked PCs, telephones, HVAC, etc.)  The PICs will
Nelson> need to communicate about two bytes (status change of nine LEDs and which
Nelson> PIC sent the event) every 5-10 minutes.  Two of the events are pretty
Nelson> important and would need to be acknowledged by the other PICs.  Initially,
Nelson> the network will be 300' end to end with 18 PICs.  The network could expand
Nelson> to 2000' end to end and about 100-200 PICs.

I suggest you RS485 and 75176 transceiver. I do it lots of time in
noisy environment and didn't have any problems. Only hard thing is to
implement your own protocol... but that's not hard to much! And main
advantage is it's much cheaper of the CAN... at least here in
Yugoslavia!

--
sincerely,
 Branko
 branek@eunet.yu
 http://solair.eunet.yu/~branek
 ICQ: 15616778

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