[ntp:questions] Re: HP 58503A howto?
hmurray at suespammers.org
Mon Aug 29 14:32:55 UTC 2005
In article <BF37A360.15721%dnewman at networktest.com>,
dnewman at networktest.com (David Newman) writes:
>Greetings. I have recently come into possession of an HP 58503A GPS receiver
>and would like to use it as a reference clock for servers running ntpd on
>FreeBSD 4.x and 5.x and OpenBSD 3.x.
>Are there any howto or other documents for setting up this particular
I don't know of a HOWTO type document for that specific device.
There is a driver for it, so it shouldn't be very hard. First you
have to get a normal NTP server running, then add your GPS clock.
You need to add something like this in your ntp.conf:
server 127.127.26.1 prefer ttl 1 # Z3801A (hack)
fudge 127.127.26.1 time1 -0.967
server 127.127.22.1 # PPS driver: /dev/pps<n>
fudge 127.127.22.1 flag2 1 # falling edge
You want to leave out the "ttl 1" part - that's a hack telling
the driver to use a different serial port configuration.
You will have to adjust the number on the second line to
get the right answer on your system.
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