Typically provides 5V to power the logic side of the board and communicate with the Mach3 software.
The interface board (often called a Breakout Board or BOB) acts as the intermediary. It takes the low-voltage signals from the computer and isolates, amplifies, and distributes them to the stepper motor drivers. It also handles inputs from limit switches and emergency stop buttons. Mach3 Interface Board Wiring Diagram
In a Mach3 wiring diagram, Step (pulses) and Direction (high/low) must always be paired. Never swap them. Typically provides 5V to power the logic side
The connection to the power input The interface board must be connected to the power supply. The requirement of the power is DC15- primadilna.cz Episode 23 CNC Mach3 wiring all you need to know. Mach3 Interface Board Wiring Diagram