I haven’t used one of these, but the picture of the board does not match the instruction diagram.
The instructions indicate that the jumper is only available starting with version 3.02 of the board, but the picture is not of a 3.02 board.
This would lead me to believe that if it is a board prior to 3.02 then you don’t have the option of running Normally Closed.
This appears to be what you need to run the switches as Normally Open for a pre 3.02 board. Repeat for each axis.
There may be a problem with the Pin 11/12 swap that occurred between grbl 0.8? and 0.9?
