Loop back to sending computer and compare sent file to received file. It shouldn't matter that the cable is still on the roll(s).
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If the software can detect, compensate, avoid, or correct an anomalous condition in the system, it is, by definition, a software problem-regardless of the root cause. In the long run, for most classes of problems, it is cheaper to fix it in the SW
RS 485 test
Re: RS 485 test
