End stops problems

Hardware
1

Hello everyone and thank you very much in advance.
I am finishing building a cnc for laser with arduino cnc shield v3 with grbl 1.1. Everything is correct but now I wanted to put the final stops with their N/O switches.

I have activated $21=1 and on the Arduino board I have connected only one switch for testing. The connection is such that: the COM cable connects to the black pin of the board and the N/O cable connects to the white pin (side by side in the end stops section of the board).

My surprise comes when with a single switch it makes me stop in all the axes, that is, I can have the switch connected to the board for +X, for example, and whether I move the machine along the +X, -X, + And, -And, with a single switch it stops them all for me.

Do you know what it could be due to?

Thank you.

2

Maybe its meant to be an emergency stop.

3

Thanks for the reply.
But then how do I make sure that shield does not interpret it as an emergency stop but as an end stop?

4

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