11. Perform the same operations as in step 9 to complete an   Additional Align   on 
that star. 
12. You should now be ready to observe. 
2.2  Installation 
If you bought your mount with Gemini already installed, 
you can skip the motor installation section.  However, you 
should review the other sections covering cables and 
power. 
2.2.1  Motor Installation 
If you bought your Gemini as an add on to an existing 
mount, you will first need to replace the existing motors 
with the Gemini servomotors.  Follow the instructions that 
came with your Gemini kit to remove the existing motors 
and install the Gemini servomotors. 
2.2.2  Cable Installation 
You will have one of two different types of motor cables 
for your Gemini.  You may have two flat 8 connector 
ribbon cables with an RJ 45 connector on each end, or you 
may have two round cables with 6 pin DIN connectors at 
each end.  These cables are used to connect the drive 
electronics to the servomotors.  Both cables are electrically 
identical, but one is longer than the other.  Plug one end of the shorter cable into the 
connector on the right ascension motor and the other end into the connector on the drive 
electronics labeled   RA Servo.    Now take the other cable and plug one end into the 
connector on the declination motor and the other end into the connector on the drive 
electronics labeled   Dec Servo.    It is very important that you always plug the RA motor 
into the RA Servo connector and the Dec. motor into the Dec Servo connector. 
2.2.3  Encoders 
Gemini can take advantage of optional encoders on your mount.  Plug the encoder cable 
into the 8 pin socket below the HC input. The layout is compatible with the Y cable of 
the usual DSCs, like the Losmandy DSC or the NGC Max.  The encoder ratios and 
directions can be set using the   Setup
Encoder   menu item.  The default setting is 
(minus)  4096 for both axes, as used for the G 11 mount. The sign indicates whether the 
encoder is moved in the same or the opposite direction as the axis to which it is 
connected.  Refer to the table below for other Losmandy mount encoder settings.  
   
Gemini Users Manual 
7






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