Features Microcontroller: Our stepper motor driver has built in microcontroller function and smoothing filter function, the external input can operate normally without acceleration or deceleration. Chip and Setting: The stepper motor driver internally supports pointing mode with a 32 bit motor control dedicated smart chip, subdivision setting from 200 to 51200 and current setting from 0 to 6.5A. Algorithm and Isolated Differential Signal: The stepper motor driver adopts vector current, speed and position closed loop control algorithm with optical coupler isolated differential signal input, and the pulse response frequency can up to 200KHZ. Display and Key: The stepper motor driver adopts 4 digit LED digital tube display with 4 keys for intuitive and convenient operation. Multiple Protection: The stepper motor driver has protection functions such as over current, over voltage, over speed, over heat and tracking error. Specification: Item Type: Stepper Motor Driver Material: Aluminum Alloy Continuous Output Current: Minimum Value: 1A Maximum Value: 4.2A Input Supply Voltage: Minimum: 18VAC Typical: 24VAC Maximum: 80VDC  Logic Input Current: Minimum: 7mA Typical: 10mA Maximum: 20mA Overall Power Maximum: 120W Pulse Frequency: Minimum Value: 0 Maximum Value: 200kHz Insulation Resistance Minimum: 500MΩ Digital Output Port Logic Current Maximum: 100mA Digital Output Port Voltage Withstand Maximum: 24V Cooling Method: Natural Cooling Or External Heat Sink Use Environment: Use Situation: Avoid Dust, Oil Mist And Corrosive Gas As Much As Possible Temperature: 0℃-50℃ Humidity: 40-90%RH Vibration: 10-55Hz/0.15mm Storage Temperature: -20℃-+65℃ Weight: Approx. 300g / 11oz Package List: 1 x Stepper Motor Driver Note: AC input voltage in AC18V ‑ 80V, DC input DC24V ‑ 110V can work normally, power supply power is not higher than 200W, the higher the voltage input, the greater the current setting motor torsion, high speed performance, but the motor heat more, in principle, as long as to meet the use, the smaller the current setting the better. Package List 1 x Stepper Motor Driver