CentOS 7, Motorola GPS receiver and NTP
Hello everyone.
Currently my Stratum 1 NTP server is made up of the following:
Pentium 4 Motherboard, Single core, 1.4GHz., 1GB memory
Slackware Linux, 11.0.0
PPSkit-2.1.7 Kernel
uname -a:
Linux timelord 2.4.33.3-NANO #1 Fri Nov 12 21:28:51 EST 2010 i686
pentium4 i386 GNU/Linux
Motorola, GPS Receiver Version: 3, Revision: 1, Software Date: 1A30,
Model: R5222U1114/[UT], Serial: R0AZSU
As far as I know the PPSKit was never released for the
later kernels and this machine is showing it's age.
I want to get a new box and run CentOS 7 on it.
Question: How do I setup NTP with a 1 PPS from serial port
and the Motorola receiver hooked up?
I hope that some here have done this already and
I wont have to start from scratch.
I was thinking about the Atom driver?
How do I tell the driver to use the data from the serial port?
Any help would be greatly appreciated.
George, N2FGX
Hello!
Current version of NTP supports Motorola Oncore and PPS. Take a look at
http://support.ntp.org/bin/view/Support/ConfiguringMotorolaOncoreRefclocks
Edésio
On Wed, Nov 26, 2014 at 11:49:59AM -0500, xaos wrote:
Hello everyone.
Currently my Stratum 1 NTP server is made up of the following:
Pentium 4 Motherboard, Single core, 1.4GHz., 1GB memory
Slackware Linux, 11.0.0
PPSkit-2.1.7 Kernel
uname -a:
Linux timelord 2.4.33.3-NANO #1 Fri Nov 12 21:28:51 EST 2010 i686
pentium4 i386 GNU/Linux
Motorola, GPS Receiver Version: 3, Revision: 1, Software Date: 1A30,
Model: R5222U1114/[UT], Serial: R0AZSU
As far as I know the PPSKit was never released for the
later kernels and this machine is showing it's age.
I want to get a new box and run CentOS 7 on it.
Question: How do I setup NTP with a 1 PPS from serial port
and the Motorola receiver hooked up?
I hope that some here have done this already and
I wont have to start from scratch.
I was thinking about the Atom driver?
How do I tell the driver to use the data from the serial port?
Any help would be greatly appreciated.
George, N2FGX
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On Wed, Nov 26, 2014 at 10:36 AM, Edesio Costa e Silva <
time-nuts@tardis.net.br> wrote:
Hello!
Current version of NTP supports Motorola Oncore and PPS. Take a look at
http://support.ntp.org/bin/view/Support/ConfiguringMotorolaOncoreRefclocks
Edésio
The above is certainly required reading. But in addition What I would do
is first set up the NTP server using about 3 or 5 Internet "pool" servers
and make sure your other computers are able to connect.
Next work on connecting the hardware. Many times you can directly connect
the 5 volt TTL level encode to an RS232 serial port. They are spec'd for
different voltages but is works most of the time. To be 100% sure you
need to convert the TL level to the rs232 level.
One place where an error is easy to getting the polarity go the PPS signal
correct. It you invert it then yo are syncing on the trailing edge, you
want the leading edge.
--
Chris Albertson
Redondo Beach, California
On Wed, Nov 26, 2014 at 11:49 AM, xaos xaos@darksmile.net wrote:
Question: How do I setup NTP with a 1 PPS from serial port
and the Motorola receiver hooked up?
You'll want to review the documents at ntp.org and the list <
http://lists.ntp.org/listinfo/questions>.
The folks there will be happy to assist you.
There are two important points:
-
Until 4.2.8 is released you'll want to build a recent version of 4.2.7.
Don't use 4.2.6 -
Review the many and varied posts on the subtleties of using PPS via ATOM
or as part of a refclock like ONCORE <
http://www.eecis.udel.edu/~mills/ntp/html/drivers/driver30.html>. It can
have surprising side-effects.
Check out the synergy m12 eval board. It's about $100 with the m12m on it
and a little less if you're going to install your own.
The most recent ftdi in-tree driver will automatically support the
adapter. Previous versions you need to echo the VPI to the sys
tree interface of the ftdi_sio driver - which is trivial to do in
rc.local.
On Wednesday, November 26, 2014, Paul tic-toc@bodosom.net wrote:
On Wed, Nov 26, 2014 at 11:49 AM, xaos <xaos@darksmile.net javascript:;>
wrote:
Question: How do I setup NTP with a 1 PPS from serial port
and the Motorola receiver hooked up?
You'll want to review the documents at ntp.org and the list <
http://lists.ntp.org/listinfo/questions>.
The folks there will be happy to assist you.
There are two important points:
-
Until 4.2.8 is released you'll want to build a recent version of 4.2.7.
Don't use 4.2.6 -
Review the many and varied posts on the subtleties of using PPS via ATOM
or as part of a refclock like ONCORE <
http://www.eecis.udel.edu/~mills/ntp/html/drivers/driver30.html>. It can
have surprising side-effects.
time-nuts mailing list -- time-nuts@febo.com javascript:;
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
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