[time-nuts] Are serial port headers standardized?

Sarah White kuzetsa at gmail.com
Sat Oct 20 02:21:38 EDT 2012

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:


"AGI-G217 USB GPS Receiver"

^copied from other thread:

"Followup (still want a GPS-type NTP refclock)"

Thanks again,

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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