Do you see a pulse frequency and a Time in Int on the Diagnostic page?
Do you have the correct port address set up?
Can you attach the xml for the profile you are using, you will find it in the Mach3 folder. If you use the standard Mill profile it will be called Mach3Mill.xml, you will need to copy that to a different location on your drive and rename it before the forum will accept it, suggest you rename to wtxrcdog.xml
Hood