Just noticed on your signature that you have an LX200... So you don't need a star-mate mate...
All you need is a DSI or LPI and you'll be away!! The DSI/LPI software has built in autoguiding features. It will connect directly to you mount via the serial cable.
For your EQ6, you can use the same software and camera, but here you'd need the star-mate LX200 emulator (or similar hardware) to interface to the mount.
Hope this helps.
Cheers