NexStar Resource Site

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Ports and Connectors on CGE Pro Scopes

Click here for a diagram by Larry McNish depicting NexStar cable/port connections.

  • RS-232 Port - located on the bottom of the hand control.  The primary usage of this port is for controlling your scope with the wide variety of astronomy software available for PCs, Macs and PDAs.  A secondary usage is for updating the motor control firmware in the mount - details are found here.  The connector is a 4 conductor RJ-22 - the slim connector used for most telephone handset cords.  The signaling is standard RS-232 levels.  Click here for details on the cable used to connect this port to a PC.
  • HAND CONTROL Port - located on the electronics pier.  The primary usage of this port is for connecting the hand control, however, this port is actually the same as the two AUX ports on the pier, and so, the hand control can be connected to those ports as well.  The connector is a 6 conductor RJ-12.  The signaling is TTL and so a serial port on a PC should not be connected to this port.
  • AUX-1 and AUX-2 Ports- located on the electronics pier.  These ports are designated for "smart accessories", for example, the optional CN-16 GPS module - Celestron part number 93967.  Also as noted above, the hand control can be connected here rather than in the fork arm.  The connector is a 6 conductor RJ-12.  The signaling is TTL and so a serial port on a PC should not be connected to this port.
  • AUTO GUIDE Port - located on the electronics pier.  This port is designed for connecting a standard autoguider - generally based on a CCD camera.  The connector for this port is an RJ-12 and the pin designations are found here.  Also, you can build or buy a manual hand control that allows manual guiding or fine movement control and connect it to this port - details are found here.
  • PC Port - located on the electronics pier.  This port can be used with two software packages from Celestron.  The first is for upgrading the motor control firmware, though with hand control version 4.13 or higher, motor control firmware can be updated via the RS-232 port on the bottom of the hand control as well.  The second is for a PC-based virtual hand control called NexRemote - details are found here.  All other software on the market either communicates via the RS-232 Port discussed above or communicates with NexRemote which in turn communicates with the scope via this port.  The connector for this port is an 8 conductor RJ-45.  The signaling is standard RS-232 levels.  When using NexRemote with the PC port, you need a "programming cable", not the standard RS-232 cable used to connect to the port on the bottom of the hand control.  Click here for details on the cable used to connect this port to a PC.
  • DEC Port - located on the electronics pier.  Used to connect the declination motor and encoder to the electronics pier.
  • RA Port - located on the electronics pier.  Used to connect the right ascension motor and encoder to the electronics pier.
  • DC IN Connector - located on the electronics pier.  This is the connector for the power source driving the scope - details on this connector are found here.


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