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Celestron Computer Interface Serial Cable RS-232 to Standard Serial Port

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#1 hobbes

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Posted 20 November 2019 - 12:31 AM

I am looking to replace my Celestron Computer Interface Serial Cable RS-232 to Standard Serial Port, which requires an RS-232 to USB adapter as well, splitting the cable into two. My cable locking units are both male screws, and risk coming apart. I was wondering if anyone has had any luck finding a 1 piece USB to computer interface (guide port) cable?



#2 mclewis1

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Posted 20 November 2019 - 09:29 AM

There is no standard for a 4 pin RJ11 RS232 serial cable. The Celestron cable is different from the Meade cable and neither makes a unified USB-serial hand controller cable. So, you're on your own.

 

a) make your own custom cable (paying very close attention to the pinouts). You're only dealing with 4 pins/wires so this is with a little care is actually quite easy.

b) find a pair of the correct nuts to use on DB9/DB25 connectors so you can use the bolts built into the DB9 RS232 connector. The kits that supply the correct size bolts and nuts for these connectors are cheap and not very popular anymore.

c) just use some electrical tape and tape the serial cable connection together (remove the thumb bolts to make it all smaller) so you end up with a single cable with a "bump" in the middle.


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#3 Pauls72

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Posted 20 November 2019 - 08:54 PM

Replace male screws on one of the connectors with female like these.

https://www.ebay.com...scAAOSwcBhWZHoD

 

https://www.ebay.com...5.c100005.m1851


Edited by Pauls72, 20 November 2019 - 08:55 PM.

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#4 hobbes

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Posted 20 November 2019 - 09:45 PM

Replace male screws on one of the connectors with female like these.
https://www.ebay.com...scAAOSwcBhWZHoD

https://www.ebay.com...5.c100005.m1851


Oh fantastic. Much better than buying a second cable with the correct screw nuts. Thanks.

#5 skywolf856

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Posted 22 November 2019 - 07:32 PM

Check this, I used this info to make my own.

 

https://www.nexstars.../RS232Cable.htm



#6 hobbes

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Posted 22 November 2019 - 10:14 PM

Nice, thanks for sharing that. I'll have to try and make one some time.

For now, I've ordered the female connectors for my cable to ensure a tightened fit.

#7 KLWalsh

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Posted 23 November 2019 - 12:08 AM

Risk coming apart?
Do they not sell duct tape where you live?
Or better, use 3M painter’s tape; no tape residue.

#8 Pauls72

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Posted 23 November 2019 - 01:14 AM

Check this, I used this info to make my own.

 

https://www.nexstars.../RS232Cable.htm

Problem is what your telling him to make is exactly what he already has a DB9 to RJ11 cable.

He would need the USB to RS232 converter part. It would be something like this.

http://electronics-d...tic.php?id=1006

Then instead of putting the DB9 connectors in the middle, he could wire it direct to the RJ11 connector.


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#9 hobbes

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Posted 23 November 2019 - 02:11 PM

Problem is what your telling him to make is exactly what he already has a DB9 to RJ11 cable.

He would need the USB to RS232 converter part. It would be something like this.

http://electronics-d...tic.php?id=1006

Then instead of putting the DB9 connectors in the middle, he could wire it direct to the RJ11 connector.

 

Correct, I would want to wire it directly to the RJ11 connector. At some point, I'd like to see if I can make this one single cable.

 

I also would prefer to stay away from using a quick tacky solution (pun intended). The female serial connectors were ideal, and I did order a pack on Ebay for about $3, which is cheaper than replacing the cable that includes the female connectors (and probably cheaper than a roll of duct/painters tape, not to mention more aesthetically satisfying).


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