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Re: [questions] Re: GPS+PPS vs NTP server, why a huge offset ?




> On 17 Jun 2022, at 23:31, Jim Pennino <jimp@xxxxxxxxxxxxxxxxx> wrote:
> 
> Daniel O'Connor <darius@xxxxxxxxxxx> wrote:
>> 
>>> You of course can get the ASCII data over USB, but to get a PPS signal
>>> you in general have to hack a USB GPS and add a signal wire for PPS then
>>> hack some interface on the computer to accept PPS.
>> 
>> This is absolutely not true in any meaningful sense.
> 
> OK, then to which of the USB connector pins do you connect the PPS
> signal to get "PPS over USB"?

You can connect them to CTS or RTS, on FreeBSD these can then hook into the kernel PPS API.

It works very well in practise, especially for the cost & effort required.

--
Daniel O'Connor
"The nice thing about standards is that there
are so many of them to choose from."
-- Andrew Tanenbaum
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