AUTOMATION DIRECT STP-DRV-4850 / STPDRV4850 (NEW IN BOX) STEPPER DRIVE, SURESTEP, ADVANCED MICROSTEPPING DRIVE, 5A PER PHASE, 2-PHASE, 24-48VDC INPUT, BIPOLAR, MOSFET, DUAL H-BRIDGE, 4-QUADRANT OUTPUT, 200-51200 STEPS PER REVOLUTION, (1) RS-232 (RJ11) PORT(S) "NEW" old stock. Outside cardboard box These are surplus items for training in a major technical training school. See our other equipment plus various Festo Lab-Volt trainer and testing systems and field device simulation modules. Some are listed some are not. Also other testing and training set ups in other auctions. These training systems can also be modified and wired for use with other systems you choose. The last 4 photos are of these testing and training systems in different auctions. Please contact us for any questions