Do you have any idea what PNP and NPN mean?

I'm powering via the usb but I have the connection from the CNC board to a CIB breakout board. I think I'm having problems with the connection between the two cards as the breakout board has its own 5v supply.

Have you connected your stepper drives to the 25 sub connector from the CNC Card or connected to something else?

Cheers for the help,
Ant