Celestron C6-NGT Computerized Manual

Celestron Teleskop C6-NGT Computerized

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Side 1/8

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+

GOTO precise AZM-ALT “b12AB0500,40000500” “#” 2.2+

Sync

To Sync to an object via serial commands, the user should center a known object in an eyepiece. Then the Sync serial

command should be sent, using the celestial coordinates (RA and DEC) for that object. This causes future GOTO or

Get Position commands to use coordinates relative to the Sync’d position, improving pointing accuracy to nearby

objects. (we probably don't need to mention "from the planetarium package" since it also improves pointing accuracy if

they GoTo objects via the hand control.) The format for the RA/DEC positions in the Sync command is identical to the

GOTO RA/Dec command.

Command Function PC Command Hand

Control

Response

Applies to

Versions

Sync RA/DEC “S34AB,12CE” “#” 4.10+

Sync precise RA/DEC “s34AB0500,12CE0500” “#” 4.10+

Tracking Commands

The following commands retrieve or set the tracking mode.

Depending on the mount type, following tracking modes are available:

0 = Off

1 = Alt/Az

2 = EQ North

3 = EQ South

Note: On the CGE and Advanced GT hand control versions 3.01 through 3.04 the value for EQ North is 1 and EQ

South is 2. This has been corrected to match the other models in current hand control versions.

Command Function PC Command Hand Control

Response

Applies to

Versions

Get Tracking Mode “t” chr(mode) & “#” 2.3+

Set Tracking Mode “T” & chr(mode) “#” 1.6+

Slewing Commands

The following commands allow you to slew (move) the telescope at fixed or variable rates.

For variable rates, multiply the desired rate by 4 and then separate it into a high and low byte. For example if the

desired tracking rate is 150 arcseconds/second, then:

trackRateHigh = (150 * 4) \ 256 = 2, and

trackRateLow = (150 * 4) mod 256 = 88

For fixed rates, simply use a value from 1-9 (or 0 to stop) to mimic the equivalent hand control rates.

Note: in most configurations, issuing the slew commands will override (or conflict with) the tracking mode of the

mount. Hence it is always best to disable tracking first using the Tracking Commands, issue the slew command, then

re-enable tracking. The main exception to this is when tracking equatorially - the fixed rate slews at 1 or 2 will not

override tracking. This can be useful to simulate autoguiding.

Note: on GT models, the fixed rate slews at rate 9 move at 3 degrees per second instead of the maximum rate.

Produkt Specifikationer

Mærke:	Celestron
Kategori:	Teleskop
Model:	C6-NGT Computerized

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