Hi, what I'm trying to do is find out the link, if there is one, between the screen button's or enter blocks. Don't know how to insert a pic so anyway on the Mach3 Big Blue Screen we have the probe setup and the "plate thickness" enter block, my question is what is the GetDRO number for this block? Similarly there is a "edge finder dia" on the Offsets screen, what would the GetDRo number be for this be. The reason for my questions is I'm writing a script to find the x, y, and z edge. I have one which is working but don't understand why?