Feature: 1. APPLICABLE MODEL: Stepper motor controller board fully supports for MACH3, for KCAM4, for EMC2, the upper computer software support parallel port control, all 12 data transmission output pins of all parallel ports can be drawn, and 5 stepper motor drivers can be controlled 2. INPUT AND CONTROL: CNC stepper motor breakout board has 5 input interfaces, which can access limit switch, emergency stop switch and reset knife; 5 input LED indicate the input status, all 1 way use 12A relay control, normally open, normally closed out, convenient user connection 3. POWER SUPPLY AND SIGNAL: The power supply of CNC control board adopt 5V USB power supply or external power supply to facilitate access to external power supply; Enable signal amplification, filtering, and enhancement processing on external drivers 4. SPEED AND INTERFACE: CNC breakout board support pulse and directional signal shaping to enhance the on load capability and the data transmission speed is up to 10 MBit/S. The output pin header with expansion interface can be 2.54mm pin header 2.54mm XH‑Block 5. SAFE HEAT DISSIPATION: CNC control board has prevent reverse circuit, even if the power is accidentally inserted, will not burn the chip, and is safer to use. The base adopt a dense tooth radiator, which has strong heat dissipation and ensure stable operation of equipment 6. OPTOCOUPLER ISOLATED INPUT: The input signal of the control board adopt high speed optocoupler isolation to ensure that does not lose step, and the pulse direction signal adopt the same level 6N137 dual high speed optocoupler 7. FLEXIBLE AND CONVENIENT: Stepper motor controller board support a variety of half current mode and half current selection, more flexible to use. The attenuation mode can be adjusted to ensure the smooth operation of the motor. There is a list of setting methods on the board for easy use 8. EXQUISITE EXTERIOR SIZES: The CNC breakout board cooling pad is 75mmx65mm, the four mechanical mounting positioning holes are 67mmx58mm, and the mounting holes are 4mm in diameter Specification: Item Type: CNC Stepper Motor Controller Board Power Supply: 5V USB Data Transfer Speed: Maximum 10 MBit/S Expansion Port: Approx. 2.54mm / 0.1in Voltage: 12-60V Cooling Pad Size: Approx. 75 x 65mm / 2.95 x 2.56in 4 Mechanical Mounting Positioning Holes Size: Approx. 67 x 58mm / 2.64 x 2.28in Mounting Holes Diameter: Approx. 4mm / 0.16in. Package List: 1 x Controller Board 1 x Connecting Cable