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NexStar Communication Protocol

This document describes the serial commands supported by the Celestron NexStar hand control. This information

applies to the NexStar GPS, NexStar GPS-SA, NexStar iSeries, NexStar SE Series, NexStar GT, CPC, SLT, Advanced-

GT, and CGE 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.

Note: the GT hand control prior to version 104.0 should be treated as version 1.2 in the tables below. Version 104.0

should be treated as version 4.03.

Get Position Commands

The following commands retrieve the position of the telescope in either RA/DEC or AZM-ALT coordinates.

The position is returned as a hexadecimal value that represents the fraction of a revolution around the axis. Two

examples are given below:

•If the Get RA/DEC command returns 34AB,12CE then the DEC value is 12CE in hexadecimal. As a percentage

of a revolution, this is 4814/65536 = 0.07346. To calculate degrees, simply multiply by 360, giving a value of

26.4441 degrees.

•If the precise GET AZM-ALT command returns 12AB0500,40000500 then the AZM value is 12AB0500 in

hexadecimal. As a percentage of a revolution, this is 313197824/4294967296 = 0.0729 or 26.252 degrees.

The standard commands offer a precision of 1/65536 * 360 * 60 * 60 = about 19.8 arcseconds per unit while the precise

commands offer a precision of 1/16777216 * 360 * 60 * 60 = about 0.08 arcseconds per unit (only the upper 24 bits are

used).

Note: if the telescope has not been aligned, the RA/DEC values will not be meaningful and the AZM-ALT values will

be relative to where the telescope was powered on. After alignment, RA/DEC values will reflect the actual sky,

azimuth will be indexed to North equals 0 and altitude will be indexed with 0 equal to the orientation where the optical

tube is perpendicular to the azimuth axis.

Command Function PC Command Hand Control

Response

Applies to

Versions

Get RA/DEC “E” “34AB,12CE#” 1.2+

Get precise RA/DEC “e” “34AB0500,12CE0500#” 1.6+

Get AZM-ALT “Z” “12AB,4000#” 1.2+

Get precise AZM-ALT “z” “12AB0500,40000500#” 2.2+

GOTO Commands

The following commands direct the telescope to GOTO a specified RA/DEC or AZM-ALT position. As with the Get

Position commands, the values are in hexadecimal and represent the fraction of a rotation around the axis.

Note: GOTO RA/DEC commands will not work unless the telescope is aligned.

Command Function PC Command Hand

Control

Response

Applies to

Versions

GOTO RA/DEC “R34AB,12CE” “#” 1.2+

GOTO precise RA/DEC “r34AB0500,12CE0500” “#” 1.6+

GOTO AZM-ALT “B12AB,4000” “#” 1.2+

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