Thread: Can't enumerate the entire bus
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Unread 02-14-2011, 10:59 AM
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Re: Can't enumerate the entire bus
Hmm... This sounds like cabling and/or termination problems. Make sure that your terminators haven't shorted out. The picture that has you putting the 100 Ohm resistor in the RJ-12 jack is misleading. If you use that approach, it's real easy to bend the resistor leads and short them out leading to a lot of CAN weirdness.

I typically create a small pigtail coming out of the RJ-12 and solder the terminator resistor to that and insulate it w/ some heat shrink. I also put the terminator resistor in the DB9 shell (run 6C wire from the RJ-12 to the DB9 and put the terminator in the shell where it's protected). That approach has lead to very solid CAN performance.

HTH,

Mike
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