Gemini Users Manual 7
Additionally, a second submenu item "Reset to Defaults" was introduced there to allow
you to reset only the Safety Limits to their default values (both east and west) without
having to reset all the other Setup values.
Another new submenu, “Set GoTo”, allows you to define a point past which Gemini will
always GoTo the object so that the telescope tube is on the east side of the mount.
Gemini will allow the mount to track past this point, but will not GoTo any object west of
this point without a meridian flip, if needed, to put the telescope tube on the east side of
the mount. The default value, displayed as 0 degrees, sets the GoTo limit to the western
safety limit minus 2.5 degrees, allowing for at least 10 minutes of tracking.
1.3.12 Selectable PC Synchronization Behavior
Gemini accepts two different kinds of Sync commands over the serial line. The LX200
protocol :CM# command shifts the internal coordinate system to reflect the latest position
correctly, "Synchronizing" it to an object. On the other hand, the additional ":Cm#
command uses the detected positional difference to enhance the internal pointing model.
The software running on a connected computer can choose between either.
Since there are still some software packages on the market not supporting the Additional
Align feature, Gemini's software now allows you to set the way :CM# and :Cm#
commands are interpreted. The Setup→Communication menu item now contains a "Sync
or Align" submenu. "Sync Only" selects Gemini's standard behavior as described above,
while "Sync→Add. Al." swaps the functionality of both commands, allowing
enhancement of the pointing model even with PC software not supporting this explicitly.
1.3.13 Precision Guiding Commands
The serial command protocol has been extended to allow precise movement commands to
be sent to Gemini. These commands include:
• Move at guide speed for a specific number of milliseconds
• Move at guide speed for a specific number of steps
• Move at guide speed for a specific number of arcseconds.
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