Gemini Hand Control

Section 2.4.1 - Using The Gemini Hand Control

The Gemini Hand Control is optionally available to allow control of the Gemini controller while at the telescope. The Hand Control provides a digital read-out and IN and OUT focus functionality.  A MODE button is also provided to switch between the Focuser and the Rotator.  Pressing the MODE button will toggle between a splash screen with the hand control firmware version number, Focuser, Rotator, and the Home screen.  The home mode allows you to rehome the focuser or the rotator.

The Hand Control should be connected to the Hand Controller port of the Gemini control box using either the short or long 4-pin coiled cable included with the package.  Most any telephone handset cable will work but a ferrite core choke may be required for longer cables if the "Waiting for Data" error appears and persists.  

The Hand Control can be plugged in or disconnected anytime without concern about damaging either the Gemini control box or the Hand Control.  Using a serial protocol, the PIC in the Hand Control communicates with the main PIC in the Gemini box receiving position updates and sending new position requests.  All position changes are instantly communicated to the control PC so that each display system is simultaneously updated with the current focuser position.