Thank you for the info.
I am trying to get an old machine build in 1992, to make a tool change it use to work with a G23 code.
We lost all the parameters that came with the machine, I was able to upload
a set of parameter similar to the original ones, the machine maker no longer has the original parameters, so they send me the ones I uploaded.
Now when it reads G23 I get "undefined G code".
It makes the tool change if I by pass the limit switch, I guess that's why it needs G23.