The macro itself uses G31 (in mach3 you could use g28.1 but that is not available to me in uccnc), and it performs a test to see which input is triggered so it needs 1 digital input, and 1 digital output pin. Sheetcam just calls the macro, it does not need to know or set the offset because the macro does that automatically based on whether the ohmic sensor or the floating head was triggered. Then get it to retract to the pierce height and continue the gcode sequence as normal. I used m3100 as I do my touchoff with G31). In sheetcam, all you do is ask it to do a touchoff via macro number (say M1000 or whatever unique number you choose. I don't have such a macro for mach3, but do have one for uccnc (which is c# and not cypress visual basic)
SHEETCAM G31 SOFTWARE
Whatever gcode interpreter software you are using) to automatically set the correct offset based upon which sensor is triggered and give you a message to inform you that the ohmic touchoff is not working or floating head has failed. I would suggest you create a touchoff macro in mach3 (mach4, uccnc, linuxcnc. Nacs Fab, Sorry I have not had the time to come back to you since the pm, but it would probably be beneficial to discuss on the open forum as someone else may benefit from this.
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