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

The shield is optional, I've run RS422 (same type of signal) at least 1000 feet with just three wires, the third being the ground reference.  As we discussed before, the ground reference is only needed for stuff that may have a different ground reference, for stuff all in the same room, it wouldn't typically be needed.

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