[time-nuts] Are serial port headers standardized?

[Bob Camp]

Hi

We have made a similar transition. In the process we have demonstrated that there are a seemingly infinite number of ways to number the pins on a connector. Needless to say, that's made the process "interesting". It's one thing when you have a D-Sub with numbers moulded into the connector so you can say "this is right". When you go to the miniature connectors, you loose the built in numbers. No way (other than somebody's drawing) to prove who got it wrong..

Bottom line - be really careful when you see pin numbers on the little connectors, they are not as standard as one might like…

Bob

On Oct 21, 2012, at 9:07 AM, Magnus Danielson <magnus at rubidium.dyndns.org> wrote:

> On 10/21/2012 02:30 AM, Bob Camp wrote:
>> 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…
> 
> Well, as you are older than me, it is expected that you could top that one, in fact it would have been a failure on your part if you couldn't. :)
> 
> Anyway, it's a well established standard which fits the needs.
> 
> At work we have transitioned over to a smaller connector (for space reasons) and also dropped the RS-232 driver as it is only used for debugging anyway, so we have a small board which has level converters and 8P8C (aka RJ45) connector.
> 
> Cheers,
> Magnus
> 
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