Celestron C5-S, C8-S, C9.25-S Appendix D RS-232 Connection, Communication Protocol

Page 58

Appendix D - RS-232 Connection

You can control your telescope with a computer via the RS-232 port on the computerized hand control and using an optional RS-232 cable (#93920). Once connected, the telescope can be controlled using popular astronomy software programs.

Communication Protocol:

The Advanced GT communicates at 9600 bits/sec, No parity and a stop bit. All angles are communicated with 16 bit angle and communicated using ASCII hexadecimal.

Description

PC Command ASCII

Hand Control Response

Notes

Echo

Kx

X#

Useful to check communication

Goto Azm-Alt

B12AB, 4000

#

10 characters sent. B=Command,

 

 

 

12AB=Azm, comma, 4000=Alt. If

 

 

 

command conflicts with slew limits,

 

 

 

there will be no action.

Goto Ra-Dec

R34AB, 12CE

#

Scope must be aligned. If

 

 

 

command conflicts with slew limits,

 

 

 

there will be no action.

Get Azm-Alt

Z

12AB, 4000#

10 characters returned,

 

 

 

12AB=Azm, comma, 4000=Alt, #

Get RA-Dec

E

34AB, 12CE#

Scope must be aligned

Cancel Goto

M

#

 

Is Goto in Progress

L

0# or 1#

0=No, 1=Yes; "0" is ASCII

 

 

 

character zero

Is Alignment Complete

J

0# or 1#

0=No, 1=Yes

Commands below

 

 

 

available on version 1.6

 

 

 

or later

 

 

 

HC version

V

22

Two bytes representing V2.2

Stop/Start Tracking

Tx

#

Alt-Az tracking requires alignment

 

x = 0 (Tracking off)

 

 

 

x = 1 (Alt-Az on)

 

 

 

x = 2 (EQ-N)

 

 

 

x = 3 (EQ-S)

 

 

32-bit goto RA-Dec

r34AB0500,12CE0500

#

 

32-bit get RA-Dec

e

34AB0500,12CE0500#

The last two characters will always

 

 

 

be zero.

Commands below

 

 

 

available on version 2.2

 

 

 

or later

 

 

 

32-bit goto Azm-Alt

b34AB0500,12CE0500

#

 

32-bit get Azm-Alt

z

34AB0500,12CE0500#

The last two characters will always

 

 

 

be zero.

The cable required to interface to the telescope has an RS-232 male plug at one end and a 4-4 telephone jack at the other end. The wiring is as follows:

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Contents Advanced Series Advanced Series GT Introduction Assembly Telescope Maintenance Page Advanced Series Advanced C8-SGT Shown Autoguider PortSetting up the Tripod C9.25-SAttaching the Equatorial Mount Installing the Counterweight BarAttaching the Center Leg Brace Installing the Counterweight Attaching the Hand Control Holder Advanced GT Models OnlyAttaching the Optical Tube to the Mount Attaching the Visual BackInstalling the Finderscope Installing the Star DiagonalInstalling the Eyepiece EyepieceMoving the Telescope Manually Removing the Lens CapRear Cell Balancing The Mount in R.A Balancing The Mount in DECAdjusting the Mount in Altitude Adjusting the MountAdjusting the Mount in Azimuth Powering the Telescope Attaching the Declination Cables For GT Models OnlyAdvanced GT Hand Control Hand Control Operation Alignment Procedures Startup ProcedureAuto Align Auto Three-Star AlignLast Alignment Quick-AlignRe-Alignment Slewing to an Object Object CatalogSelecting an Object Finding PlanetsDirection Buttons Tour ModeConstellation Tour Rate ButtonSetup Procedures Identify Precise GoTo Observing Tip Helpful Hint Utility Features Helpful Hint Advanced GT Celestial Coordinate System Motion of the Stars Latitude Scales Pointing at PolarisFinding the North Celestial Pole Declination Drift Method of Polar Alignment Observing the Planets Observing the MoonLunar Observing Hints Observing the SunSeeing Conditions Solar Observing HintsObserving Deep Sky Objects TransparencyPage Short Exposure Prime Focus Photography Eyepiece Projection FullLong Exposure Prime Focus Photography Planet ISO Moon Mercury Venus Mars Jupiter SaturnPage Reducing Vibration Terrestrial PhotographyMetering CCD ImagingAuto Guiding Care and Cleaning of the Optics CollimationCollimated telescope Should appear Symmetrical with Page Page Page Appendix a Technical Specifications Appendix B Glossary of Terms Page Eclipsing or obscuring the brightness of the star Appendix C Longitudes Latitudes Georgia Minnesota Rhode Island Canada Appendix D RS-232 Connection Communication ProtocolAdditional RS232 Commands Reset The Position Of Azm Or AltAppendix E Maps of Time Zones Page Page Page Page Page Page Page Celestron TWO Year Warranty
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C9.25-S, C5-S, C8-S specifications

Celestron, a leader in the field of amateur and professional astronomy, offers a range of telescopes ideal for both novices and experienced stargazers. Among their most celebrated models are the C8-S, C5-S, and C9.25-S, each designed with unique features and technologies that enhance the observational experience.

The Celestron C8-S is an iconic telescope known for its 8-inch aperture. This Schmidt-Cassegrain design combines a compact form factor with a powerful light-gathering capability, making it perfect for deep-sky observing. Its optical tube has a focal length of 2032mm, providing an excellent balance of wide field viewing and high magnification. The C8-S features Celestron's StarBright XLT optical coating, enhancing light transmission and contrast, ensuring that even faint objects are visible. With compatibility for various accessories and a sturdy mount, the C8-S stands as a versatile option for different observing styles.

Moving to the C5-S, this model boasts a 5-inch aperture while maintains a compact and portable design. It is particularly popular among travelers and casual astronomers who value convenience without compromising on quality. The C5-S also employs the Schmidt-Cassegrain design, providing sharp images and improved color correction. With its shorter focal length of 1250mm, the C5-S excels in both planetary and deep-sky observation. The telescope's lightweight build makes it easy to transport, while the integrated optical systems ensure a clear view of celestial objects.

The C9.25-S represents a step up in performance, featuring a 9.25-inch aperture that captures more light than its smaller counterparts. This telescope offers a versatile focal length of 2350mm, allowing for impressive high-power planetary views, as well as detailed observations of deep-sky objects. The C9.25-S utilizes a unique StarBright XLT coating and features advanced optics that minimize optical distortion, resulting in sharp, high-contrast images. It is equipped with a sturdy mount that ensures stability during extended observation sessions.

All three models are compatible with Celestron's advanced computer-driven mount systems, allowing for effortless tracking and alignment. With built-in features such as GoTo technology, users can easily locate thousands of celestial objects with the touch of a button. This combination of advanced optics, portability, and user-friendly technology makes the Celestron C8-S, C5-S, and C9.25-S excellent choices for anyone looking to explore the cosmos more deeply. Whether for casual stargazing or serious astronomical study, these telescopes deliver exceptional performance to meet a variety of needs.
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