Thread: Can't enumerate the entire bus
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Unread 02-14-2011, 11:08 AM
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AKA: Oliver Graff
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Re: Can't enumerate the entire bus
Quote:
Originally Posted by taichichuan View Post
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
I use the wires to make a terminator plug approach as well. I also made another one just to be sure. The only thing I haven't swapped out is the DB9 to rj12 connector although I tested it with a multimeter and the resistance on the middle two pins seems fine as well as the continuity between the proper serial and RJ12 pins. I'm pretty stumped.
Oliver
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