[grbl Issue#1247] Grbl 1.1 $N0 & $N1 problem

Hi ;

I am doing a cnc and i’m working with grbl, when I run the program will not look for the homing but it starts directly in the program gcode.

I want to know what is the utility of $N , $N0 & $N1 ? Because when i modified $N0 and $N1 the cnc works in a space defines without any problem.

Thanks to all