Seth, the 1A-1B and 2A-2B nomenclature is the standard motor naming convention for the poles of the motor. Pole 1 gets connected to 1A and 1B, Pole 2 gets connected to 2A and 2B. If the motor rotates backward from the desired direction or the Duet board reports “short to ground” then swap the A-B on one of the poles.
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