[time-nuts] Are serial port headers standardized?

shalimr9 at gmail.com shalimr9 at gmail.com
Sun Oct 21 08:24:58 EDT 2012


Charismatic impedance, he?

Was that with one wire for data and the two neighboring wires as ground?

Didier KO4BB

Sent from my Droid Razr 4G LTE wireless tracker.



-----Original Message-----
From: Bob Camp <lists at rtty.us>
To: Discussion of precise time and frequency measurement <time-nuts at febo.com>
Sent: Sat, 20 Oct 2012 7:31 PM
Subject: Re: [time-nuts] Are serial port headers standardized?

Hi

I do believe I can top that one :)

Back in the 70's (do I need to mention jobs …) these were already an established item. Before that point (as in back in school … don't ask when that was) I spent some time modeling the charismatic impedance of the connector plus cable combination. Turns out that 120 ohms is a pretty good match…

Bob


On Oct 20, 2012, at 2:42 PM, Magnus Danielson <magnus at rubidium.dyndns.org> wrote:

> On 10/20/2012 04:15 PM, Sarah White wrote:
>> On 10/20/2012 10:06 AM, Bob Camp wrote:
>>> Hi
>>> 
>>> The IDC to 9 pin cables are a generic / cheap item on eBay or from Newegg. Less than $3 delivered last time I needed any.
>>> 
>>> Bob
>> ((...snip...))
>> 
>> Motherboard manual said:
>> "Connect one side of a switching cable to the header and then attach the
>> serial COM device to the other side of the cable."
>> 
>> ... is "IDC" another way of saying this? what does the acronym represent?
> 
> IDC block header is a more correct term as I recall it. Wikipedia concurs:
> http://en.wikipedia.org/wiki/Insulation-displacement_connector
> 
> Back in the 80thies when I had my first job, these 10-pin IDC block header serial cables was already an established standard. If you have hard serial interface on your motherboard, be lucky, plug it in and run!
> 
> Cheers,
> Magnus
> 
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