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