... Stepper Controller with Drives UIROBOT 1.UIM240 parallel port step driver2.Miniature Size 42.3mm*42.3mm*13. ... Constant, PWM controlMicrostepping: Full-, Half-, Quarter- and 16th-step (2)Photocoupler Isolation voltage: 2500 Vrms (min)Photocoupler Input current: ... adjustable through on-board POT(2) adjustable through on-board DIP switchCommunication: 3-wire, Step, Direction, and Enable signals Handling ...