Customer Reviews

50
4.4 out of 5 stars
Celestron Nexstar RS 232 PC Interface Cable
Price:$10.99 + Free shipping with Amazon Prime
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17 of 17 people found the following review helpful
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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9 of 11 people found the following review helpful
on February 11, 2013
Verified Purchase
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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3 of 3 people found the following review helpful
on April 28, 2014
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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8 of 10 people found the following review helpful
on July 16, 2008
Verified Purchase
This interface cable was essential for updating the software on the hand control and scope motor. Required the purchase of an after market cable to connect the RS-232 cable to hand control base outlet(no need to connect to the outlet on the scope base with the SE).
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3 of 3 people found the following review helpful
on January 4, 2014
Verified Purchase
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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2 of 2 people found the following review helpful
on January 10, 2015
Many of the bad reviews here are based on the ignorance of the buyer, not the quality of the product. (Don't you just hate that!) I want to educate you so that you don't buy this by mistake.

Many Celestrons, like my Nexstar GPS, have a phone jack on the base into which you can plug some kind of controller to steer the telescope. Programs such as "Starry Night" and "SkySafari" can use the telescope controls, but they need some way to make the hardware connection, and the phone jack is for this purpose. But nothing "talks" to a phone jack, so they offer this phone jack to RS232 interface cable. RS232 is a "communications protocol" that was used years ago to let your computer send data to things like printers and other devices, but it was replaced on modern equipment by the USB protocol, which is faster and easier to use. Your modern computer probably doesn't have an RS232 jack on it, and your modern laptop for sure does not, as the connector is too thick for a nice, thin laptop. But your computer, in all likelihood,does have a number of USB ports, unless you own a Mac (like me) with only one or two and a bunch of useless Thunderbolt ports. So, what you need to connect to your computer or to a Wi-Fi gadget (such as a "Skyfi") is an RS232 to USB cable. And, the cables have a sexual orientation. This cable has a female RS232 plug, so the RS232 to USB cable must have a male plug.

As an example, you get this cable, get a Skyfi (which comes with a RS232 male cable, I think), and then you can connect your telescope to the Skifi. The Skifi gives a Wi-Fi link to your Wi-Fi enabled device - iPhone, iPad, whatever. (I believe that Android devices need a different gadget. Do your homework.) You can control the telescope wirelessly from your iPad or iPhone.

COOL!

So, in essence, it goes: telescope -> this plug -> another cable { -> "computer" OR -> Wi-Fi device -> "computer" }. And, you need to make sure that your computer's software supports your telescope once connected.

Okay, now what is to criticize for this cable?? It either works or it doesn't. It's a wire with connectors. Sure, you can criticize the quality of the wire or the connectors, but why give one or two stars to something that you ignorantly bought by mistake!! Do your homework!
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3 of 3 people found the following review helpful
on October 7, 2011
Verified Purchase
Just works, haven't had any issues with this product. Used a serial to usb adapter and this works great for controlling my cg5 via a computer.
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1 of 1 people found the following review helpful
on August 25, 2012
Verified Purchase
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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on December 2, 2013
Verified Purchase
What can I say? This product does it's job well. I can now control my CG5-GT from my laptop via ascom. the celestron nexcontroller program allows you to do your entire polar alignment routine from you laptop, and you have PHD connection with your autoguider whihc allows you to record PEC data from your favorite pec program. I can now go out and balance my mount in the evening before it gets cold and operate everything from inside to do astrophotography without going out in the cold. I use an rs232 serial connection with a 3/4 express card adapter with my laptop, and an extension cable to reach my mount out in the yard. All I need now is a motofocus contorller and I will be staying alot warmer this winter!
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on October 29, 2014
Verified Purchase
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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