So I am working on retrofitting a Dyna 2100 CNC with a GRBL 1.1 controller and would like to use the existing stepper drivers. Attached is a link to the stepper driver connections with the wiring diagram that I have. What I am wondering is what the brown wire going to the two pin connector is used for. I cann't read it on the wiring diagram and was wondering if anyone had the original manual with wiring diagram that shows what that actually is for. So far I have the following wiring map:

Red - +24V
Black - GND
Orange - +5V
Blue - Step
Green - Direction
White - limit

I am thinking that for now this should be all I need to get started, but knowing what the brown wire is would be helpful.

Thanks in advance to anyone that can help.

https://dan.bemowski.info/wp-content...ver_wiring.png

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