[time-nuts] Are serial port headers standardized?
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 <- Serial out
o o <- Serial in
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:
> "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...
>> 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:
>> ... 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,
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