Gemini Users Manual 49
5 Gemini Command Menu Reference
The Gemini Menu system consists of a tree of menus and submenus displayed on the
Hand Controller's 16-character LED display. There is a Main Menu (the first hierarchal
level) and several levels of submenus. As previously described, you can scroll through
menu choices using the up (DEC+) and down (DEC-) directional buttons on the Hand
Controller, and move from higher menu levels to submenus by pressing the right (RA+)
directional button (unless the RA REV button on the Hand Controller has been pressed).
Generally, pressing the RA+ button while at the lowest level of the menu tree causes
Gemini to select or execute the command or menu choice that is visible on the display.
When this occurs, the display either acknowledges the choice (e.g. "FINISHED"), returns
to a higher menu item (e.g. "Object Database"), or merely goes blank, requiring that the
MENU button be pressed again to return to the menu system. An exception is where the
menu item calls for multi-digit numeric input; in that case, pressing the RA+ button
moves the input cursor 1 digit to the right. Finally, pressing RA+ when the cursor is at
the digit on the far right enters the input data.
5.1 Startup Mode Menu
In addition to the menu system that is available during normal usage, there is a separate
menu that is displayed each time Gemini is powered on. This menu allows you to select
the startup mode of the system for that particular observing session. The choices are:
• Cold Start
• Warm Start
• Warm Restart
5.1.1 Cold Start
When Gemini is powered on for the first time or after a CMOS reset, a "Cold Start” is the
only startup option available. Once Gemini has been cold started, "Cold Start," "Warm
Start," and "Warm Restart" are displayed as menu items the next time Gemini is powered
on. "Cold Start" is the "start-from-scratch" choice because it deletes all previously
established star alignments, as well as the current pointing model derived from previous
alignments. It is the startup mode that must be used after the mount has been moved
from its previous polar-aligned position.
You can change the UTC Date/Time, Mount Type, Longitude and Latitude immediately
after a Cold Start. Refer to section 2.4.2.1 Cold Start Setup Options for an explanation of
how this is done.
Assuming Gemini was polar aligned (sections 2.4.1.1 and 3.4) and powered on with the
telescope in Startup Position (section 2.4.1.2), you can easily GoTo a first alignment star
from the "GoTo Bright Star" menu item, or select a star from the "Bright Stars" catalog
and perform a GoTo operation. Using either method, the star to be used for alignment is
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