Reply to "Using an optocoupler to connect insulated rail to input pin of shift register"

gunrunnerjohnOGR Forum Member SUPPORTING MEMBERDIGITAL SUBSCRIBER

Twisted pair is actually fairly important for RS485 signals. Since the signals are differential, the twisted pair prevents EMI from upsetting the signal unless it's very strong. The EMI is induced in equal and opposite directions on the twisted pair, that results in minimal signal degradation. At high data rates, twisted pair also prevents excessive radiated EMI from the lines. RS422 and RS485 really need twisted pair if it's going any distance.

4/5/175:19 PM

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