https://warp9td.com/images/BOB_Vendo...line/ST-V2.pdf

The brown cable is connected to the 24v outlet offered from the BoB. Now i've tested the sensors and they should light when they have at least 12v passing through them but they are not when connected to the breakout board so It could just be a simple output setting that is not toggled in the mach 3 settings that I am not aware of.

The negative is connected to the ground on the board below the input for the limits.

Rob