This module implements the serial commands supported by the Celestron
NexStar hand control (HC) and SkyWatcher/Orion SynScan HC. This applies
to the Celestron: NexStar GPS, NexStar GPS-SA, NexStar iSeries, NexStar
SE Series, NexStar GT, CPC, SLT, Advanced-VX, Advanced-GT, CGE, CGEM etc.
SkyWatcher: EQ5, HEQ5, EQ6 (Pro), AZ-EQ5 GT, AZ-EQ6 GT, EQ8 etc. and the
corresponding Orion mounts.

Communication to the hand control is 9600 bits/sec, no parity and one stop bit via the RS-232 port on the base of the hand control.

For extended example how to use this perl module look in to the distribution folder for This program is a complete console tool to control NexStar telesctopes based on NexStarCtl module.

To control network based telescopes nexbridge must be used on the remote site.


  • Can control network exported mounts with nexbridge
  • nexstarctl - console tool to illustrate how to use the library and control your telescope
  • All published NexStar commands are supported
  • Full SkyWatcher / Orion support (HC firmware > X.38.6)
  • Record / Play PEC data
  • Download / uplod PEC data from/to the mount
  • Set / Get mount backlash settings
  • Set / Get autoguide rate
  • Some AUX commands are supported since v.0.10
  • Both Equatorial and Alt/Az mounts are supported
  • Coordinates can be converted to the current epoch
  • Works with Linux, Mac OS X, FreeBSD, Solaris and Windows

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