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Celestron Nexstar RS 232 PC Interface Cable

4.6 out of 5 stars 68 customer reviews
| 8 answered questions

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  • Interface your NexStar telescope with your laptop or PC
  • Control telescope by clicking on sky maps on computer monitor
  • RS-232 jack on one end of cable, standard serial connector on other
  • Certain telescopes allow downloading new data into database
  • 62-inch length
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Frequently Bought Together

  • Celestron Nexstar RS 232 PC Interface Cable
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Total price: $24.82
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Technical Details


Product Description

Interface your NexStar telescope with your laptop or PC Control telescope by clicking on sky maps on computer monitor RS-232 jack on one end of cable, standard serial connector on other Certain telescopes allow downloading new data into database 62-inch length

Product Information

Product Dimensions 5.7 x 4.9 x 0.9 inches
Item Weight 2.4 ounces
Shipping Weight 0.8 ounces (View shipping rates and policies)
ASIN B0000665UZ
Item model number 93920
Customer Reviews
4.6 out of 5 stars 68 customer reviews

4.6 out of 5 stars
Best Sellers Rank #18 in Camera & Photo > Camera & Photo Accessories > Telescope & Microscope Accessories > Telescope Accessories
Date first available at Amazon.com April 30, 2002

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Customer Questions & Answers

Customer Reviews

Top Customer Reviews

By Balint Sztaray on February 10, 2008
My laptop doesn't have an RS-232 port (as usual) so I had buy a USB to RS232 converter (on ebay). After installing the proper ASCOM driver, my Celestron NexStar 114 can nicely be controlled from SkyMap. Just click on a star on the chart and the telescope slews there. Position/time synchronization is also really easy.
NOTE: Before you buy this item, do find out what an RS-232 port is, and if your computer doesn't have one, buy an adapter first.
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I bought a used Celestron NexStar 6se, and the cable wasn't included by the seller. I bought this cable and a TRENDnet USB to RS-232 Serial Converter, and it worked the first time connected to my laptop running Windows 7 64-bit. No need to install any drivers for the converter, Windows took care of it. No problems whatsoever.
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The cable does what it claims: It provides a 5' long link from the Celestron Nexstar hand controller to the RS-232 port of your computer. That few, if any laptops (or desktops) have an RS-232 port doesn't seem to matter to Celestron. You will need a serial port to USB adapter, meaning more expense and complication. If you want a lot of expense, Celestron will be happy to sell you one. I got this one.

Another comment. Five feet is quite short for use in the field. Some USB adapters add length, but you may also want to budget for another extension cable.

Finally, I control my mount with a Linux powered netbook running Debian Linux, and the program Cartes du Ciel. In addition I installed the package Indi-bin. The USB device that pops up on the computer is usually /dev/ttyUSB0. You will need to ensure your user is in the "dialout" group. Even then you may run into trouble "writing" to the USB device. The simplest workaround is to make /dev/ttyUSB0 universally writable by issuing the following command as root, or by prefacing the following command with "sudo":

chmod 666 /dev/ttyUSB0
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The cable will not correctly seat in my 2013 Celestron 1100 CPS XLT GPS at the base plate for Aux 1 or 2. That is because if you look at the end of your NexRemote or SkyQLink it is an RJ11 adapter with a 6 pin (6p6c) wide connector, and the Aux 1 and 2 connectors on the base plate are 6 pin 6p6c female ports as well. A visual inspection will show the connector slightly twisted to the left or to the right and not correctly seating in the RJ-11 6p6c female port.

The problem is that this cable has a 4pin wide RJ11 male connector, also known as a 4p4c (4 pin 4 connector) end which does not seat correctly in the Aux ports on the Celestron. While I have not seen a 4p4c to 6p4c cable yet I did see adapters that could be re-crimped onto the end of this cable - http://www.amazon.com/Monoprice-Round-Solid-50-Piece-107269/dp/B005E2Y7EY/ref=sr_1_6?s=electronics&ie=UTF8&qid=1398675855&sr=1-6&keywords=rj11+4p4c+to+6p4c+adapter

Here is hoping Celestron will fix this oversight soon.
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I used this with a TRENDnet TU-S9 (USB to Serial adapter from Amazon http://www.amazon.com/TRENDnet-TU-S9-USB-Serial-Converter/dp/B0007T27H8) and was able to connect to my Celestron C8i SE scope via the hand controller. After downloading
the controlling software from Celestron and upgrading the hand controller's firmware I am now able to use Celestron's NexRemote
software to direct the scope from my laptop ! And after downloading the ASCOM drivers and the star program Cartes du Ciel
I am now able to direct the scope to any object in the night sky from that star program. AWESOME !
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These cables while easy to make are still cheap enough that it would barely be worth my time. Since they are just about what I'd pay in parts and time I ordered it on Amazon and got it within a few days. With this cable you can upgrade the firmware(s) in your CG5 and likely other mounts using the same controller technology. It literally took minutes to upgrade the Controller, and the firmwares for each motor. Another added benefit of owning this cable is you can now use programs like Stellarium to control your mount.
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The cable worked just fine. After the hand controller firmware failed, updating the hand controller for the Evolution telescope was problematic because instructions were sketchy and confusing. The Evolution has an Az-El mount, and the firmware kept updating for an equatorial mount. I received a shipper from Celestron and returned the hand controller, which they reprogrammed and returned to me. Now it works correctly. In the process, I discovered I may have been doing one step incorrectly, which they did differently to get the desired result. In the interim, I used a WiFi Tab 2 with SkyPortal to operate the telescope. Once operational, the Evolution telescope is great.
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Not much to say other than it seems to be well made. It is a simple RS232 adapter cable that adapts from the RJ22 plug on the bottom of the hand controller and converts to a standard DB9 plug. One thing to note, if you are ordered an Advanced VX mount or telescope, you do NOT need to order this cable. I was under the impression that it did not come with one, so I ordered this. When I received the AVX, there was one in the box. So now, I have a spare :)
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