The Celestron Serial Programming Cable allows you to utilize online firmware updates you may need, and connects between the PC port on the telescope's drive base and your PC's serial port. It is intended for use with the NexStar I, NexStar GPS, Advanced Series, CGE & CPC series telescopes. For use with a USB port, you must purchase a serial-to-USB converter from your local electronics retailer. 84" (213 cm) in length.
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