Ahh yes, it looks like CNC4PC changed from step/dir to PWM in the current revision (9)
so you should used the 5i25_c11x2.bit bit file if you have a REV 8 C11G card and
5i25_c11gx2 if you have a REV 9 C11G card.

Whether via step rate or PWM the C11 BOB outputs an analog signal proportional
to the step rate or PWM duty cycle, so the analog 0..10V output of the BOB should be
wired to the drives analog (potentiometer) input for speed control. In addition you will need to
connect (in hal) the appropriate pins for spindle on and spindle direction