[Jonathan L.]

Try simplifying. Instead of plugging the encoder into the Talon SRX, plug it into the DIO ports on the roboRIO and use the LabVIEW example program for Encoders found by going to Help -> Find Examples and looking in the "Digital" folder. The wiring diagram for connecting the encoder to the DIO ports is on the front panel of the example program.

If that works, then you know the encoder is working and you can worry about the Talon SRX.