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Meade 505 望远镜PC连接线

DIY Meade 505 Telescope to PC Cable
Most of our readers here will be surprised to learn that I am an avid amateur astronomer. I spend every chance I get under the stars taking in the amazing views that can be seen from my 10" Meade LXD-55 Schmidt Newtonian. With my background in photography, it should come as no surprise that I have shifted more into astrophotography than visual observing. My imaging sessions are usually conducted with two of my best friends at a private observatory owned by one of them . The observatory is nice but it is located about 35-40 minutes from me and thus I do not get out there as much as I would like to. So over the last couple of months I have been gearing up my scope for imaging. One of the first task I had to tackle was building a cable that would allow me to control my telescope from my PC, and that is what today's tutorial is all about.

 

There are several reasons one would want to control their telescope with a PC:

It is faster than using the hand controller.
It gives you a visual aid when searching for something hard to find.
If you find something unknown, the planetarium software will be able to identify it.
It is a necessity if you plan on imaging anything for longer than a single quick exposure.
It's wicked cool!
Over the course of building this tutorial many people have asked me "Why not just buy the cable? They are cheap enough on Amazon or EBay." and my reply has been the same every time. "Why not build it myself?" Sure it would be faster, and with a little patience, it may even be cheaper, but none of those give me the satisfaction of saying "I built that!" Plus DIYing things is the core of the Maker Spirit!

 

Above this post you will find a parts list as well as a tools list. These are new features that you will find on all of our future tutorials. They serve two purposes, to help you quickly locate the parts needed to complete the tutorial, and to hopefully generate a little income for us here at TMWB. Each time you click on a part or tool link and purchase that item, Amazon or Element14 will cut us a small percentage of the sale. By ordering through our links, you help keep TMWB running and that enables us to focus more on building projects and tutorials.

Building the cable is quite simple and only requires soldering 3 joints and placing 3 wires into a RJ10 plug and crimping the punch downs to secure the cable. The schematic below is what we will be following. I found this diagram online several months ago and do not remember where I found it. If it is yours, please contact me so I can add attribution. I have edited it to display the colors of the wires we will be using.

Basically we just need to cross the TX and RX lines between the DB9 connector and the RJ10 jack. The ground pins also get a connection between them. When orienting the RJ10 connector align the plug so that the closed end is facing you and the tab is on the bottom. The #1 pin will then be on the left and the #4 pin on the right.

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