[time-nuts] Are serial port headers standardized?

Joseph Gray jgray at zianet.com
Sat Oct 20 21:20:09 EDT 2012

I have seen at least three types over the years. The straight IDC
crimp on both ends is the easiest and fairly common. Also common is
the one with IDC on the motherboard end and a solder cup DB-9 on the
other. In these, I mostly saw the wires soldered to alternate rows on
the DB-9 (top, bottom, repeat). And then there were the few where
someone seemed to randomly connect things as they wanted.

Joe Gray

On Sat, Oct 20, 2012 at 6:40 PM, Chris Albertson
<albertson.chris at gmail.com> wrote:
> On Fri, Oct 19, 2012 at 11:05 PM, Sarah White <kuzetsa at gmail.com> wrote:
>> http://www.newegg.com/Product/Product.aspx?Item=N82E16815158115
>> ... That's my only real question. What nonsense were they referring to?
>> "Connect one side of a switching cable to the header and then attach the
>> serial COM device to the other side of the cable."
>> "switching cable" ???? Like I said: "Do what with my what?"
> The are mostly standard.  The have to be if they use insulation
> displacement cables.  The wires are all in parallel and don't swap
> around inside a flat actable.  But there is the odd chane of "off by
> one" or "even vs. odd" problems so the best way is to read the mother
> board mmanual and then find the manual from the serial card.  YES you
> can find the serial card manual if you send enough time hunting the
> newegg or web site r google.   For $4 you can afford to gamble and I'd
> say you have a 80% chance of it working.   Those flat cable make it
> hard to be wrong.
> Worst case is you buy some jumper cable with make pines on one and and
> female on the other and patch it together.  It willl look ugly but
> still work
> Chris Albertson
> Redondo Beach, California
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