OK got it now, my bad I was getting confused with a picture I had seen of your breakout board and thought the PLCM-E3 had plugs on for the stepper drivers.

Looking at the PLC4X BoB, do you have a manual in English ?
Also you have PP port on one end and 9 pin serials on other side.

Why not fit screw connectors to the board instead of 9 pin serials, seems messy having to use the extra connector boards just to get cables out ?