im almost finish with cnc, at this point im on the limit switchs of this build. the question i have is, on the breakboard there are 4 input pins and next to each side is grd, is that the 5v input. i w

When wiring the limit switches to our BoB(breakout board), depending in the older model or our revised version (https://www.buildyourcnc.com/item/electronicsAndMotors-parallel-breakout-relay#prettyPhoto/0/), the older version will need the COM (limit switch) connected to 5V and the NO/NC to your input pin, but with our newer version you will use GND(ground instead of 5V) to common and the same for NO/NC but the setup in the mach3/confi/ports&pins/ is still the same. Here is a tutorial where you can see how to set up the limit switches correctly (with our older parallel BoB): Part 1:(https://www.youtube.com/watch?v=5lER74YSmvA), Part 2:(https://www.youtube.com/watch?v=vagOQkunwsM)