[time-nuts] Are serial port headers standardized?
Bob Camp
lists at rtty.us
Sun Oct 21 12:29:00 UTC 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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