I did some of the rewiring yesterday, but today I decided to have a play with the LCD screen as I woke up with a pain in my shoulder and didn't fancy playing about in the cold workshop.

It was really satisfying to get it all working, the Mach3 plugin communicates with the custom HID device and this then displays the information on the LCD screen. Here's a sample picture...

Click image for larger version.  Name: screen.jpg  Views: 944  Size: 87.8 KB  ID: 11859

I still might change what information is displayed on the screen, but that should be no problem now the basic hardware and code are working.