[time-nuts] Are serial port headers standardized?

Bob Camp lists at rtty.us
Sun Oct 21 08:29:00 EDT 2012


Hi

Yes, every other wire grounded. As you look at the connector all the pins on one side are grounded.

Bob

On Oct 21, 2012, at 8:24 AM, shalimr9 at gmail.com wrote:

> 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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> 
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