Help with selecting hardware for CNC retrofit

Measured DC voltage over "+" and "-" see attached picture.
Also same voltage over "+" and ground "GND".

- and gnd ? Always 0 ?

Yes, no voltage difference over "-" and "gnd" when I run the motor.
I will check the motorspeed tomorrow when it runs on max (3V) and see if it comes up to 2000rpm/min as the motordata says.

Nice, so it is an analog drive with +-5V or +-10V , so a Mesa 7i92 with Mesa 7i77 should do just fine or go for the Mesa 7i97 as it has both on the same board.
BTW, if you go the Mesa 5i25 or Mesa 6i25 with Mesa 7i77 route, there is no need for a parallel port.

Norrby wrote:

Yes, no voltage difference over "-" and "gnd" when I run the motor.
I will check the motorspeed tomorrow when it runs on max (3V) and see if it comes up to 2000rpm/min as the motordata says.
 

That's typical because the drive input is differential (for noise immunity) 
but the analog out from the controller is single ended.

It wasn't so easy to see the amount of rpm's but I did some more testing and managed to start a program with a lot higher speed than I was able to do in manual mode, so the driver card is -10V/10V.
Ok good, I think I'll go for the mesa 7i92M and 7i77.
Thanks for the great support!