[CS900]

The C6 has a 0-10v analog output you must have something wrong with your connections if you only have a 5v output, do you have the 12v supply to the C6 Board

well I only get a 5V "swing". So if I have the adjustment pot set to it's min, the max output i'll get is 5V. If i adjust the pot up, I can get the full 10V output, but it'll never go below 5V.

I have it hooked up to a 12V power supply as well.

I'm trying to find someone with an oscilloscope to see what input frequency is as i adjust the commanded spindle speed. I think that'll at least tell me if it's a hardware issue or software, but i'm open to any thoughts .