Hello mpam-mpam;
We can help you better if you give us information about your project:
-Model of CPU and I/O cards configuration
-Type and Model of Stepper motor you want to control
-Application: speed or torque control, maximum speed and acceleration, precision required ...
It would also help if you could give us an understanding of what you know about stepper motor control; then we can start working with you.
Hope this helps,
Daniel Chartier