Orion #10134 XT8g, 10135 XT10g Appendix B RS-232 Connection, Sending a Slow-GoTo Command

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Appendix B: RS-232

Connection

The SkyQuest XTg Mount is designed to receive commands sent from a computer’s RS-232 COM port (via the computer interface cable). The hand controller will communicate with the computer at 9600 bits/sec, no parity, no stop bit. All angles are communicated with 16 bits and communicated using ASCII hexadecimal. The chart below shows the ASCII commands from the PC, and what the hand controller’s response will be.

Additional RS-232 Commands

Sending a Tracking Rate

1.Multiply the desired tracking rate (arcseconds /second) by 4. For example: if the desired track rate is 120 arcsec- onds/second (approximately 8 times sidereal rate), then the TRACKRATE = 480.

2.Separate TRACKRATE into two bytes, such that (TRACKRATE = TrackRateHighByte*256 + TrackRateLowByte). For example, if TRACKRATE = 480, then TrackRateHighByte = 1 and TrackRateLowByte = 224.

3.To send a tracking rate, send the following 8 bytes:

a.Positive Azm tracking: 80, 3, 16, 6, TrackRateHighByte, TrackRateLowByte, 0, 0

b.Negative Azm tracking: 80, 3, 16, 7, TrackRateHighByte, TrackRateLowByte, 0, 0

c.Positive Alt tracking: 80, 3, 17, 6, TrackRateHighByte, TrackRateLowByte, 0, 0

d.Negative Alt tracking: 80, 3, 17, 7, TrackRateHighByte, TrackRateLowByte, 0, 0

4.The number 35 is returned from the hand controller.

Sending a Slow-GoTo Command

1.Convert the angle position to a 24 bit number. Example: if the desired position is 220, then POSITION_24BIT = (220/360)*224 = 10,252,743

2.Separate POSITION_24BIT into three bytes such that (POSITION_24BIT = PosHighByte * 65536 + PosMedByte

*256 + PosLowByte). Example: PosHighByte = 156, PosMedByte = 113, PosLowByte = 199

3.Send the following 8 bytes:

a.Azm Slow Goto: 80, 4, 16, 23, PosHighByte, PosMedByte, PosLowByte, 0

b.Alt Slow Goto: 80, 4, 17, 23, PosHighByte, PosMedByte, PosLowByte, 0

4.The number 35 is returned from the hand controller.

Resetting the Position of Azimuth or Altitude

1.Convert the angle position to a 24bit number, same as Slow-Goto example.

2.Send the following 8 bytes:

a.Azm Set Position: 80, 4, 16, 4, PosHighByte, PosMedByte, PosLowByte, 0

b.Alt Set Position: 80, 4, 17, 4, PosHighByte, PosMedByte, PosLowByte, 0

3.The number 35 is returned from the hand controller.

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Contents Orion SkyQuest XTg GoTo Dobsonians Overview of SkyQuest XTg Dobsonian 12 shown Table of Contents Parts ListUnpacking Box #2 Dobsonian Base Refer to Figures 3 Base hardware for SkyQuest XTgAssembly Assembly of the Dobsonian BaseAssembly of the Optical Tube XT12g Only Shaft Spring EZ Finder Connecting the Optical Tube to Dobsonian BaseAccessory Installation Operating the EZ FinderReplacing the Battery Using EyepiecesAligning the EZ Finder GoTo Hand Controller Scroll Buttons Setup for AutoTracking or GoTo ModeSetup for AutoTracking or GoTo Mode Dual Purpose buttonsUsing the Telescope AutoTracking Mode Alignment for GoTo OperationBrightest Star Alignment SW 235SE Two-Star AlignmentSelecting an Object Using the Telescope in GoTo ModeObject Database in the Hand Controller Pointing Accuracy Enhancement PAEOther Functions Utility FunctionsSetup Functions TrackingPage Recalling a user-defined object Using the User Defined DatabaseSaving an object to the database Identifying an Unknown ObjectLinking with a Computer Disconnecting from the ComputerPreparing the Computer for the Update Updating the GoTo Hand Controller’s FirmwarePreparing the Telescope for Collimating Collimating the Optical SystemCollimation Cap and Mirror Center Mark Aligning the Secondary MirrorFocusing the Telescope Using Your TelescopeStar-Testing the Telescope Aligning the Primary MirrorMagnification Viewing with EyeglassesAiming/Pointing the Telescope 1200mm = 42x 28mmAstronomical Observing Astronomical Objects MoonCare and Maintenance Cleaning Eyepiece LensesCleaning Mirrors Specifications SkyQuest XT8gSkyQuest XT10g SkyQuest XT12g Menu Tree Appendix a Time Zones of the World Resetting the Position of Azimuth or Altitude Additional RS-232 Commands Sending a Tracking RateSending a Slow-GoTo Command Appendix B RS-232 ConnectionStar Charts Page Page Page Page Page Page Page Page One-Year Limited Warranty

10135 XT10g, 10134 XTBg, 10135XT12g, #10134 XT8g specifications

The Orion #10134 XT8g, #10135 XT12g, #10134 XTBg, and #10135 XT10g are exceptional choices in the realm of computerized telescopes, catering to both novice stargazers and seasoned astronomers. These models are designed for easy use while delivering stellar performance and high-quality optics.

At the heart of these telescopes is the high-quality optics that Orion is renowned for. Each model features a primary mirror made from durable glass, enhanced with a parabolic shape to minimize optical distortions and improve light gathering capabilities. The XT8g and XT10g utilize an 8-inch and 10-inch mirror, respectively, while the XT12g boasts a large 12-inch aperture, providing users with deeper views of celestial phenomena. The larger the aperture, the more light the telescope can collect, revealing fainter objects in the night sky.

In terms of technology, the "g" designation signifies that these telescopes are equipped with Orion’s innovative GoTo system. This advanced motorized mount enables users to easily locate and track celestial objects with the push of a button, making the stargazing experience more enjoyable and accessible. The system includes a database of thousands of celestial objects, allowing users to explore the universe with ease.

The XTg models also come with an intuitive hand controller that features a user-friendly interface for navigating the night sky. Additionally, the telescopes can be controlled via a smartphone or tablet, providing flexibility for tech-savvy users who prefer modern conveniences.

Durability and stability are crucial in any telescope, and the XT series does not disappoint. Each model is constructed on a robust and stable base, designed to minimize vibrations and provide a steady view, even at higher magnifications. This stability ensures that amateur astronomers can enjoy detailed views, from the craters of the moon to the rings of Saturn and beyond.

Each telescope comes with a cradle-style altazimuth mount for easier adjustments and tracking capabilities. The included eyepieces allow for various magnifications, enhancing the viewing experience and enabling observers to appreciate the beauty of the cosmos.

In summary, the Orion XT series, including the #10134 XT8g, #10135 XT12g, #10134 XTBg, and #10135 XT10g, stands out for their exceptional optics, innovative GoTo technology, robust build quality, and user-friendly operation. These telescopes are ideal for anyone wishing to explore the wonders of the night sky, making them a worthy investment for years of astronomical discovery.
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