[time-nuts] Are serial port headers standardized?

[Azelio Boriani]

Usually a crimp type DB9 can be wired directly to the crimp type IDC
connector, leaving out the pin 10 of the IDC, it is missing in the header.
But, yes, better to test as indicated by Peter.

On Sat, Oct 20, 2012 at 8:34 AM, Hal Murray <hmurray at megapathdsl.net> wrote:

>
> kuzetsa at gmail.com said:
> > 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, ...
>
> USB delays and jitter are on the order of 1 ms.
>
> Things like 590 ms offsets are firmware bugs.  If they are constant, you
> can
> fix them by fudge-ing.  The ones I've seen have 100 ms of wander.  The rest
> is (mostly) constant.
>
>
> [COM1 header]
> > Are they fairly standard?
>
> I'm pretty sure they are all setup so that a ribbon cable from a 10 pin
> header to a DE-9 will work correctly.
>
> Beware: They also use a 10 pin header for getting 2xUSB to the front panel.
> There may be a missing pin on the USB and/or serial header that would
> allow a
> connector with a pin filled to not-fit on the wrong header.
>
>
> > Will this work:
> > http://www.newegg.com/Product/Product.aspx?Item=N82E16815158115
>
> Looks good to me.  (But no promises.)  If I had that problem, I'd try
> something like that.
>
> Note that there are 2 sizes of PCI brackets.  The old ones are about 4
> inches
> tall.  The "low profile" ones are much shorter.
>
>
> --
> These are my opinions.  I hate spam.
>
>
>
>
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