Fig 1.
North Hemisphere East Side
Figure 2		 North Hemisphere West side
Figure 3

Fig 1 and Fig 4 show the relationship of the different in limits between the northern hemisphere and the southern hemisphere.  The Limits are switched between the hemispheres as far as east and west is concerned, but stay the same for left and right.  Left and Right is determined by standing in front of the telescope with you back to your respective pole.  In figures 2, 3 and 5, 6, you see the angles that are default for the G8,G11, Titan and Titan 50.  The MI-250 angles are different, and should be 95 for the Left limit and 92 degrees for the Right limit.  Note: the Hemisphere is selected totally by the sign of the Latitude in the Gemini-2. Positive for Northern Hemisphere and negative for Southern Hemisphere.  It was the same in the Gemini-1 also.  No switches to change at all.


Fig 4.
114D Southern Hemisphere
Figure 5		 123 D Southern Hemisphere
Figure 6

WebInterface Set Safety Limits
Fig 7, Click on image for larger image
 

Fig 8
The limits can be set either using the Web interface, on the Mount Selection Page, See Fig 7.  or on the hand controller see figure 8 left. (it is under Menu-->Mount-->Limits
Note that the Web limits are set for left and right side, while the hand controller uses East and West.  If using the hand controller, follow these steps. Also the safety limits are referenced to the CWD startup position.  If you did not start up with a Cold start, or Warm Start with the mount at CWD, you must do this before setting the limits.
It a very bad idea to start up with a "Warm Restart" and assume that the Gemini 2 has remembered the CWD.  You can tell the Gemini-2 to part at CWD to make sure it knows where CWD is.
  1. Turn off tracking by placing the mount into Terrestrial mode.  Menu->Track->Terrestrial
  2. Move the RA using the Left-Right buttons to the Eastern Limit.  NOTE: ALWAYS START WITH THE EAST LIMIT. Loosen the clutch in Dec. Make sure you can spin the telescope as much as possible in Dec without it hitting the mount.  Use the Menu->Mount->Limits->"Set Limits Here" button, to set the Eastern Limit. 
  3. Move the RA using the Left-Right buttons to the Western Limit.  Loosen the clutch in Dec. Make sure you can spin the telescope as much as possible in Dec without it hitting the mount.  Use the Menu->Mount->Limits->"Set Limits Here" button, to set the Western Limit. You now have set the Limits

  1. The Western Goto Limit determines how far past the meridian that Gemini-2 will do a meridian flip.  It is calculated like this. Note that the Meridian is at 90 degrees.
    The point of Meridian Flip = Western Safety Limit - Western Goto Limit.
    An example is if you have the Western Safety limit set to 100 degrees - The Western GOTO limit of 2.5 degrees (default) you end up with a point of flip of 97.5 degrees, or 7.5 degrees past the meridian. Any target selected that is past this will do a meridian flip.  Any target on the East side (Northern Hemisphere) will not do a meridian flip.
  2. Note: Limits do not take effect till the mount is powered off and then back on.