(filename touch_off.ngc)
 otouch_off sub
 G90 (absolute)
 G0 X30
 G0 Y30
 G91 (incremental)
 G38.2 Z-2.0 F10 (probe)
 G90 (absolute)
 G92 Z0 (Set Z0 also add thickness off touch plate)
 G91 (incremental)
 G1 Z-10 (move z axis up)
 otouch_off endsub
 M2 (end program)