Hi byveldesc,
Can you provide me with some of the different sources you have read, and can you explain exactly how you are trying to use the myRIO with the Suppo 20A ESC? I'm not sure I'm following exactly what you are trying to do, but I believe that you are sending a PWM signal from the myRIO to the ESC, and that the ESC is not responding as desired? If that's the case, I'm not sure this is the best location to get support for this. While we're more than happy to help you troubleshoot any issue you have with your myRIO, it seems like you are able to get your myRIO to function as expected and your ESC is not responding as desired. These forums are more or less for support with NI's products. I know you are working with a myRIO, but if your trouble actually lies with the Suppo 20A ESC, we won't really be able to support you on that front.
-KingPGeorge