![]() Can you tell us what they say? Maybe a close up photo from front and back of PCB near that connector would help us. ![]() At a guess I'd expect those to be the ones you need for the limits. I can also see some with labels starting with X/Y/Z but I can't make out the labels clearly. There are pins on the header that seem to be labelled A0-A7 and D13 - and the diagram on the above linked page tells you what those are used for. The standard grbl limit inputs are on D9 (X) D10 (Y) and D12 (Z). This isn't really a common board, and if there is no documentation for it it will be difficult for us to assist you. Ralph, the only reference to this "stock board" you mention that I could find is one AliExpress seller:
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