5V, e-stop, resume, hold, abort on version 2.11 board

[tomsepe]

Please explain the pins on the bottom of the 2.11 version board.
5V -- NC
E-STOP -- NC
RESUME -- GND
HOLD -- GND
ABORT -- GND

I am assuming that a switch is connected between these pins to activate these features?

Does do each of these then send a specific Gcode command to the arduino running GRBL or are these pins connected to the raspberry pi?

I looked on the wiki but there was no detailed explanation of how to use these pins.

Thanks

[Bertus Kruger]

Abort, Hold, Resume are all linked pins that GRBL checks and acts on. No G-Code involved and part of GRBL code.

E-STOP is the emergency stop that reset the Microcontroller.,

Abort, Hold, Resume gets activated when connected to ground.