[time-nuts] Are serial port headers standardized?

Peter Bell bell.peter at gmail.com
Sat Oct 20 02:33:10 EDT 2012


If it's one of those 10-pin 0.1" pitch IDC headers with only 9 pins
installed then the vast majority of them have the same pinout - which
is designed to match with a 9-pin D-type connector using a straight
cable.  If you have access to a meter then a quick confidence check is
to verify that the pin that's on it's own next to the missing one is
connected to ground.  Another test is to use a terminal emulation
program (something like teraterm)  set up with flow control disabled
and no local echo and check for an echo if you jumper the serial in
and out pins.

      o  <- This pin should be ground
 o   o
 o   o <- Serial out
 o   o <- Serial in
 o   o

Regards,

Pete



On Sat, Oct 20, 2012 at 1:21 PM, Sarah White <kuzetsa at gmail.com> wrote:
> 3x corrections:
>
> 1)  Page 11, there is a yellow pinout header labeled "15"
> 2)  I think I tossed the "serial port" cables (headers are on the MB)
> 3)  clarification...
>
> USB-type GPS uses the same driver as an actual USB-serial adapter does:
>
> ((...snip...))
> http://www.ankaka.com/usb-gps-receiver-for-computers-laptop-worked-as-gps-navigator_p46411.html
>
> "AGI-G217 USB GPS Receiver"
> ((...snip...))
>
> ^copied from other thread:
>
> "Followup (still want a GPS-type NTP refclock)"
>
> Thanks again,
> Sarah
>
>
> On 10/20/2012 2:05 AM, Sarah White wrote:
>> I've done enough reading to know that continuing to use this navigation
>> (NOT timing mode) GPS is not an option.
>>
>> Initially, I was pleased to find out that the old RS232 (serial) <--->
>> USB adapter I pulled out of storage uses the same prolific 2303
>> USB-serial driver
>>
>> ... At least at first I was.
>>
>> Supposedly, normal serial ports have less trouble with latency than
>> anything done over USB. I definitely have an annoying 590 (ish)
>> millisecond delay when using the NMEA driver on my NTP daemon, and
>> basically, it shouldn't ever be necessary to use the "fudge" times if
>> you're doing things right.
>>
>> None of that is a question.
>>
>> I just feel foolish for nearly putting a nicer (timing mode) GPS on a
>> USB <--> serial adapter.
>>
>> So I was looking at my motherboard manual, and realized something:
>>
>> (( QUOTE ))
>> COM1 (Optional)
>> The motherboard kit provides an additional serial COM header for your
>> machine. Connect one side of a switching cable to the header and then
>> attach the serial COM device to the other side of the cable.
>> (( END QUOTE ))
>>
>> Do what with my what? err...
>>
>> http://www.evga.com/support/manuals/files/122-ck-nf63.pdf
>>
>> Page 15, there is a yellow "10" (9) pin header, and page 26 was what I
>> quoted. Really wish there was more information... I've had this
>> motherboard for something like 5 years at this point, and am fairly
>> certain I lost or outright tossed the "serial port" headers.
>>
>> Are they fairly standard?
>>
>> Will this work:
>>
>> http://www.newegg.com/Product/Product.aspx?Item=N82E16815158115
>>
>> ... That's my only real question. What nonsense were they referring to?
>>
>> "Connect one side of a switching cable to the header and then attach the
>> serial COM device to the other side of the cable."
>>
>> "switching cable" ???? Like I said: "Do what with my what?"
>>
>> Thanks everyone,
>> Sarah
>>
>
>
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