PWM Cable Voltage

[ATannahill]

Please tell us what you are trying to do. I do not know anything about Roboview but I also do not know anything about connecting a limit switch to a PWM port and having a beneficial result. You might need to take a step back and ask a simpler question (i.e. "How do I wire a limit switch?")

A factual answer is that the wires has no voltage. Voltage is the difference in potential energy between two points being evaluated (such as the ends of the wires). For there to be a potential difference you need to have something between the points (a resistor, a capacitor, air, etc.), the wire (while technically a resistor) is not significant enough to cause a voltage between the two points.

The pins on the roboRIO PWM ports do have voltage when compared to the negative input terminal. When the cable is plugged in properly (black on the outside) the black wire has 0 volts, the red wire has 5 volts and the white wire carries a signal voltage meaning it changes between 0 and 5 volts based on software on the roboRIO.

If that sounds confusing, feel free to ignore it and just address my first paragraph.