The Astro-Physics control boxes GTOCP1, GTOCP2, and GTOCP3 have a focuser port that can be used to send voltages to a motorized focuser using a DC synchronous motor.  Focusers requiring a driver cannot be controlled through the servo control box, but should have their own ASCOM drivers. Consult your mount's manual for more information.

To access the telescope setup window you can use the Windows menu: Start->Program Files->Astro-Physics->ASCOM Driver->Setup Focuser:

SetupFocuser

If you are using Windows Vista, Windows 7, or later operating system you may see a UAC dialog asking if it is OK to run APSetup.exe. You must click Yes to continue.

FocuserControlA