[ntp:questions] almost decided which new PPS GPS to buy

David Lord snews at lordynet.org
Mon Mar 5 16:52:47 UTC 2012

Ron Frazier (NTP) wrote:
> On 3/5/2012 9:45 AM, Chris Adams wrote:
>> Once upon a time, Ron Frazier (NTP)<timekeepingntplist at c3energy.com>  
>> said:
>>> 2) Motherboard header - DB-9 port adapter
>> Note that there are two different pinouts common for this.  IIRC they
>> all have the same mapping of motherboard header pin number to serial
>> port pin number, but one numbers the header pins in rows and the other
>> in columns.
> Thanks for bringing that to my attention!  AARG!  Not yet ANOTHER non 
> standard connector.  I didn't know that.  Here's what the manual says my 
> motherboard com port connector looks like.  Each pin is an X:
> 9 X   X   X   X   X 1
>       X   X   X   X 2
> 1 = DCD
> 2 = Rx
> etc.
> Can anyone tell me the right adapter to bring it out to the rear panel.  
> I usually like to purchase on Amazon.

It depends on your motherboard so you need to order the
cable plug and D9 plug for that particular board. I usually
find I have the correct combination but if not it's usually
cheaper and quicker to make a suitable cable assembly.


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