Well, I guess I'm not sure what all you have tried or how you have things set or configured. I would first try verifying the input through the test panels in MAX. Make sure you have your DAQ card set to NRSE mode, make sure you have your SC termination equipment set as the "Accessory" to the DAQ card under it's properties, double check your connections, then see if you can read the voltage through the MAX test panels. After you can read the voltage there, then you can try using a program. I hope this helps!
Russell