Chinese 3040 limit switch help

[Trev133]

Hi. I am attempting to fit home/limit switches to my 3040 CNC router. No problem fitting the switches but I am struggling to work out where to connect the wires on the board. I have attached some photos. If anyone has experience of this controller it would be great or if someone could guide me as to what to check on the controller with a meter to identify the connection points. Help really appreciated.

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[CNCMAN172]

My guess is the limit switches will connect to those White plugs near the bottom of the phone. Need a copy of their manual to be sure.

Russ