Kirk Wallace wrote: > Typically, how long can the cable be between the UniversalPWM controller > and servo amps? The amps have differential PWM and direction inputs. I > assume they are RS-422 compatible? (Just keep below 10 mA through 1 > kOhms?) My servo amps have opto-coupled inputs. Depending on what you are using, you may need to worry about fluctuations in the ground when the amps are sending current pulses to the motor. The actual length of the cable may not be a major issue, rather the coupling of external EMI fields. Cables over ten foot or so would do well to be terminated with the cable's characteristic impedance at the receiving end.
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