Has anyone heard of a resolution to the problem with connecting limits and e-stops on these boards.

I have a USB SS and C25, and I use limits and home switches, and a touch plate with no problems.  I just followed the instructions.  I did power the SS with a separate 5 v regulated wall wart instead of using USB power.  One other thing I did was to use 0.1 μf ceramic capacitors on the inputs to the C25 for noise filtering.

Unfortunately I am not presently close to my machine so I can't furnish other details today.

John Champlain