Question

RS 232 25-pin Male to 9-pin Female Cable

Asked by: Christian2000zm

Hi Experts,

I use the above type of cable for connecting a pbx to a desktop. I am somewhere in a place where it will take at least a week to get the above standard cable. I am now thinking of modifying a 25 pin cable to suit my use.

I will like to know the color codings, i.e. which 9-wires out of the 25 can I connect to the 9-pin female end of the cable. I can solder and use it till I get the replacement.

Your help will be appreciated,

Regards,

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Asked On
2005-06-26 at 23:09:42ID21471497
Tags

cable

,

code

Topic

General Computer Systems

Participating Experts
4
Points
250
Comments
7

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Answers

 

by: nobusPosted on 2005-06-27 at 02:35:25ID: 14306823

 

by: BarthaxPosted on 2005-06-27 at 04:51:00ID: 14307514

From the following URL, I noted the text "There's no standard colour code - pick your own!": http://www.anotherurl.com/library/rs232.htm

 

by: Christian2000zmPosted on 2005-06-27 at 05:01:14ID: 14307594


Is there anything color coded? i.e. pin 1 (this color), pin 2 (this color), etc.

 

by: nobusPosted on 2005-06-27 at 05:18:23ID: 14307732

not likely, you can measure it out with an ohm meter though.

 

by: kode99Posted on 2005-06-27 at 08:36:51ID: 14309740

You may only need a few of the wires to get it to work.  Probably just the transmit, receive and ground(TXD, RXD and GND from the diagrams in link in the first message).

If this port is normally used to connect a serial printer to you may need a lot more of them to be connected.

Recently I was in a pinch and just chopped off a cable from a old serial mouse and wired it up.  Got things up and running for me until I could get proper parts.

As for colors the GND is probably black and the TXD red and maybe green on RXD but there is no guarantee.  The cable will have a whole rainbow in it but it does not take long to prove it out.  If the connector can be disassembled you might be able to see what is connected to what pins but most are molded plastic these days.  

 

by: mwnnjPosted on 2005-06-27 at 20:29:59ID: 14314956

take a look at this link too:
http://www.aggsoft.com/rs232-pinout-cable/serial-cable-connections.htm so take the suggested circuits(wiring) from nobus' posting regarding 25 PIN to 9 PIN Serial Cable connections and go through step by step,as Barthax :colour  is not so importaint ,cuz different standarts,but you have the pinouts and the circuits,,,check also:
http://www.windowsnetworking.com/articles_tutorials/dcccable.html
http://support.microsoft.com/kb/q142324/

cu

 

by: mwnnjPosted on 2005-06-27 at 20:35:27ID: 14314974

also,,,don't know if you've took a look at the Barthax' link ,but there is also a very good tutorial:
http://www.camiresearch.com/Data_Com_Basics/RS232_standard.html


later

20120131-EE-VQP-002

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