The Astro-Physics GTOCP1, 2 and 3 control boxes 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 focuser'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:

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.