Olin Lathrop wrote:

 >I think today's answer to this is CAN.  It does handle the contention=20
issue
 >in hardware, and CAN modules come integrated into many=20
microcontrollers now,
 >including a bunch of 18F and 30F PICs.

This is very true as long as you cook your own HLP protocol.  CanOpen=20
for instance is *big* and complicated, and even more so then TCP/IP.=20
DeciceNet is a little better. CanKingdom  is open but also rather=20
complicated.
Personally I hate when the protocol stack takes up most of the flash.=20
And this is true for most CAN HLP's today.

/Ake

--=20
 ---
Ake Hedman (YAP - Yet Another Programmer)
eurosource, Brattbergav=E4gen 17, 820 50 LOS, Sweden
Phone: (46) 657 413430 Cellular: (46) 73 84 84 102
Company home: http://www.eurosource.se     =20
Kryddor/Te/Kaffe: http://www.brattberg.com
Personal homepage: http://www.eurosource.se/akhe
Automated home: http://www.vscp.org


--=20
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