I have an Interact l MK II with a Heidenhain TNC 2500 control. Everything is up and running and I am using Heidenhain software to load and download programs with no problem. I have a paper copy of the parameters but I would like to down load them. The manual says to go to the external button, which I do, but I only see my programs. I also go to the parameters and look there, but I hit the external button and nothing comes up except the selection screen. What am I missing?