Celestron NexStar GPS - Auto Guiding for Astrophotography

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Auto Guiding
The NexStar GPS has a designated auto guiding port for use with a CCD autoguider. The diagram below may be
useful when connecting the CCD camera cable to the NexStar and calibrating the autoguider. Note that the four outputs
are active-low, with internal pull-ups and are capable of sinking 25 mA DC.
Figure 8-5 M27 -- The Dumbbell Nebula
4 exposures of 30 seconds each!
Figure 8-6 M51 -- The Whirlpool Nebula
9 exposures of 60 seconds each.
Figure 8-7 – Pin out diagram for Autoguider port.