A C wrote:
I will try to capture the outgoing serial data sometime either this
weekend or the next when I have a bit more time. I'll send it along to
the list as soon as I do. For now I'll leave things using PPS only and
see how it works. But I still want to eventually get the GPS refclock
working along with PPS just to have a backup clock for network outages.
Ok, so I've spliced up a serial tap cable to snoop on the data heading
out towards the GPS. Unfortunately I can't seem to decode it. No
amount of changing baud rates, stop bits and parity seems to show me
anything but a stream of unreadable binary data.
It seems to be coming out at 4800 baud although stty says the output
speed of the port is 9600. The data seems to have a regular pattern to
it with a few of the bytes changing.
If anyone can think of a utility that will attempt to autosync to the
data I'm open to suggestions. Otherwise I can try to capture the raw
data if anyone wants to look at it. Either way, it only transmits while
ntpd is using the port. If ntpd is shut down the data stops.
Can you access the output strings via a debugger?
i.e. trace writes on the port for that process?
Much easier to get an idea what is actually sent.
uwe
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