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Meade Telescope Serial Command Protocol
Revision 2010.10
7 October 2010
Introduction
This paper documents the Meade Telescope Serial Control Protocol utilized to remotely command and control Meade
Telescopes.
This command language contains a core of common commands supported by all telescopes. Due to different
implementation and
technological advances the command has extension that are not supported by all model. The differences are noted in
the descriptive
text for the commands. Finally, there are a series of new commands proposed for the Autostar II. These commands are
indicated in
the Appendix A at the end of this document.
Telescope Command Groupings: ------------------ Supported ------------
Command Group Command Designator Symbol AutoStar LX200<16" LX 16" AutoStar II
Alignment Query <ACK> x x x x
Alignment* A x x x x
Active Backlash $B - - - x
Reticule Control* B x p p x
Sync Control C p p p x
Distance Bars D x x x x
Fan* f - - p x
Focus Control Commands F p p p x
GPS Commands g - - - x
Get Information G x x x x
Home Position Commands* h x - x x
Hour H x x x x
Initialize Telescope I - - - x
Library L p p p x
Movement M x p x x
High Precision P x x x x
Smart Drive Control* $Q x x x x
Quit Command Q x x x x
Field De-rotator r - - p x
Rate Control R p p p x
Set Information S x x x x
Tracking Frequency T p p p x
User Format Control U p x x x
Way point (Site) W x x x x
Help Commands ? - x x -
Notes:
Commands accepted by the telescopes are shown in the table above indicated by an x entry. This means that
the telescope will accept these commands and respond with a syntactically valid response where required.
A "p" indicated only a subset of this command class is supported. Due to the differing implementations of
the telescopes, some of the commands may provide static responses or may do nothing in response to the
command. See the detailed description of the commands below to determine the exact behavior.
Meade Telescope Protocol
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ACK - Alignment Query
ACK <0x06> Query of alignment mounting mode.
Returns:
A If scope in AltAz Mode
D If scope is currently in the Downloader [Autostar II & Autostar]
L If scope in Land Mode
P If scope in Polar Mode
EOT – Firmware Download Request
EOT <0x04> Enter the Meade firmware downloader.
Autostar & Autostar II - This command is a propriety entrance to the firmware downloader. Details of its operation are
contained in Meade internal documents. The existence of this code should not be disclosed outside of the
company.
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