FEATURES OF LEADSHINE M542 • Low cost and good high-speed torque and Supply voltage up to +50VDC .• Output current up to 4.2A , Optically isolated input signals , Pulse frequency up to 300 KHz l Automatic idle-current reduction.• 3-state current control technology l 15 selectable resolutions , Suitable for 2-phase and 4-phase motors, DIP switch current setting with 8 different values l CW/CCW mode available (optional).• Over-voltage and short-circuit protection l Small size