Zitat:
Original geschrieben von Erups
i discovered the problem was a short on one of the signal routes on the COM card!
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This to say the when you make your cards yourself, it is almost surely a problem on those pcbs... Maybe hard to find, maybe easy... Just rerun your look on every signal route and try to find errors.
There are 10 signals FSBUS uses:
2 are ground
2 are positive
1 is MCLR (and it works you say)
1 is RA
1 is RB
three remains, check them to see if there are no shorts or other errors.