What you need to look at is the type of control signals you would need to send to the drivers/ motors. NI has motion control cards that are tightly integrated with LabVIEW that will control the motion, but the drive needs to be able to take a step and direction input, or a clockwise/counter clockwise pulse. The PCI cards are 7334 for stepper only, or 7344 for both stepper and servo. If the drives can only be accessed through serial ports, then you'll have to use Compumotor's commands to actually control them.