Zaber's T-NM products are computer controlled NEMA size 17 motors with 0.028 degree resolution. They are stand alone units requiring only a standard 15V power supply. Multiple units can be daisy-chained to a single RS-232 serial port or USB port (using an adapter) on any computer. They can also be daisy-chained with any other T-Series products. Convenient 6-pin mini din cables on the unit allow for direct interconnection between units in close proximity. For longer distances, standard cable extension can be used.