Where is pin 2 and 3 on mach3 USB breakout

The Mach3 USB Breakout board (USB Interface) does not have numbered pins like on the parallel breakout board. Instead, the pins are labeled to the device (driver, relay, etc.) that they plug into. The communication from Mach3 is sent over USB cable D- and D+ (data lines). The communication is in the form of instructions rather than steps pulses and direction signals like on the parallel breakout board. The instructions are signals like "move the x axis to this coordinate" and the microcontroller on the board interprets that instruction and creates its own step and direction signals to the terminals on the board that plugs into the drivers and other devices. If you follow the diagram below you should not have any problems. https://www.buildyourcnc.com/Documents/Electric%20Wiring%20Diagram.pdf Remember to provide power to the I and O terminals as per the diagram. Additional Information: Additional Information: How would you connect a laser to the USB control board? Additional Information: How would you connect a laser to the USB control board? Additional Information: How would you connect a laser to the USB control board? Additional Information: How to wire a laser to usb mach3 control board?