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Re: distance of pwm cable carrying seria data
Nope 4-6 feet isn't too long a run for PWM cables.
You really don't want to go beyond 6 foot as that is about the maximum(recommended).
I would double check all the connections, make sure none are lose etc...
I would also look where these cables run and what they run near.
They could be picking up noise from motors, electrical wiring etc...
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