This is a PCB for CNC system, can work with MACH 3. It is for 3 axes, 4 axes, or 5 axes. For step motors or servo motors. For ATC function. For limiting, E-STOP. Spindle controlling. It is ok for any kinds of CNC machines, CNC router, CNC plasma, CNC waterjet and all CNC, it is also a popular type for DIY. Without signal interference.
