PACIFIC SCIENTIFIC (PACSCI) STEP DRIVE 6410 Model 6410 is an economical, compact stepper drive that converts step and direction inputs into winding currents for two-phase stepper motors. The 6410 can operate with a single power supply. Output voltage is equal to the of the power supply. Output current is adjustable for 0.625 to 5A rms. The default output current is 5A rms.