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Originally Posted by Mr V
None of the FRC legal motor controls of the recent past have used the 5v signal wire in the PWM cable.
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The white wire is the signal wire, and the black wire is ground. Both are needed.
The red wire is power (not signal). It is needed only when the PWM cable is connected to a low-power servo motor. It is not needed for any of the motor controllers.
Quote:
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The way the motor controllers that I have looked at their schematics work is that the black and white wires are connected to an optoisolator. So all the signal does is light up an LED.
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The signal (white) wire carries the PWM command on it.