o<touch_plate> sub
#1 = 28.6 (plate thickness)
G21 (use metric units)
G49 (cancel tool offset)
G10 L20 P0 Z0 (clear current offsets)
G91 (switch to incremental mode)

; this section commented out for sim
;G38.2 Z-10 F[#<_hal[gscreen.search_vel]>]  (probe down)
;G1 Z1.0  (go up 1 mm)
;G4 P0.5 (pause 0.5 sec.)
;G38.2 Z-1.2 F[#<_hal[gscreen.probe_vel]>] (probe down slower)

; this section used for sim, comment out otherwise
G1 Z-10 F[#<_hal[gscreen.search_vel]>]

G10 L20 P0 Z#1  (store offset in offset table)
G90 (absolute distance mode)
G53 G0 Z0 (move Z up to 0)
o<touch_plate> endsub
M2