The Celestron RS-232 Cable is used to connect your PC or computer to NexStar computerized telescopes via a port in the hand control. The large adapter attaches to the serial port of your computer. If your computer does not have a serial port, you will need a Serial-to-USB Adapter (#18775) so that you can connect the RS-232 Cable via a USB port instead. The other end of the cable terminates in a phone-jack style plug, and simply snaps into the port designed for this purpose.Once you have connected your computer and telescope, you can update your hand control firmware. The latest updates can be found in the Support section of this website.Connecting a computer to your telescope will also allow you to navigate the telescope from your computer screen! There are many software programs available today that will not only display the night sky as it appears on any chosen observing night, but that will allow you to send your telescope to any object on the screen with the click of a button. Interface your NexStar telescope with your laptop or PC Control telescope by clicking on sky maps on computer monitor RS-232 jack on one end of cable, standard serial connector on other Certain telescopes allow downloading new data into database 62-inch length UPC 050234939201 Color Grey Model 93920 Brand Name Celestron Cable Type USB Item Shape Round Model Name 93920 Unit Count 1.0 Count Item Length 62 Inches Item Weight 0.11 Pounds Part Number 93920 Manufacturer Celestron Connector Type Rs-232 Number of Pins 9 Outer Material Plastic Number of Items 1 Connector Gender Male-to-Male Specification Met Electrical Safety, Connectivity, Cable Length Standards Compatible Devices Laptop, Monitor, PC Included Components NexStar RS-232 Cable Indoor Outdoor Usage Indoor, Outdoor Warranty Description 1 Year Parts and Labor Customer Package Type coiled in protective tubing Compatible Phone Models pc Connectivity Technology USB Ethernet Cable Category Cat 5 Recommended Uses For Product Connecting computerized telescopes for control, navigation, and firmware updates Global Trade Identification Number 00050234939201 Other Special Features of the Product Data Transfer, Downloadable Data