Yes it did help indeed! Thank you again. I can now send M3, M4, and M6 commands via the MDI in Mach.

The only thing that I have to do now is change the ' RPM DRO' To read and display the 'True RPM' Values.
I know that I have to use a screen editor to change the 'RPM' somehow from no. 39 to '1002'. Thing is, I'm using 'Screen4' and 'MachScreen' and I cannot find a procedure to do this.