Physical SET Z button on workbee cnc router

[glenmo]

Hi, I have a workbee on a Duet 2 eth that I have added trigger buttons to successfully and now I am trying to add a physical button that will "SET Z=0" with a view to building a small control pad that will move the gantry and set axis to 0 with physical buttons instead of using the DWC. I cannot find any GCODE that will allow me to set the current position of the axis to 0!
Have I overlooked the required gcode or is there another type of command that can be sent through USB / UART to do this? thanks.

[glenmo]

Looks like I found it G10 L20 P2 (P1?) Z0

[dc42]

@glenmo G92 Z0 would be simpler.