Re: [ntp:questions] GPS and NTP Server
Hallo Noosh, I look after a Hopf 6855, which is similar to your 6842 but receives LF signals from DCF77. I configured my Hopf clock as follows: Serial output: 09600 bits/sec, 8 data bits, no parity, 1 stop bit, no handshake Mode byte 1: binary 0100 Mode byte 2: binary Status and pulse output: binary 0010 Then I wired up a TTL-to-RS232 level converter to the PPS signal from the Hopf clock, and routed it to the DCD pin on the serial output connector. Make sure that your NTP is compiled with the refclock drivers 22 (PPS clock discipline) and 38 (Hopf serial). ntp.conf might look something like this: server 127.127.22.0 iburst fudge 127.127.22.0 time1 -0.005 server 127.127.38.0 iburst prefer fudge 127.127.38.0 time1 -0.04 fudge 127.127.38.0 flag1 1 When all this is working, the NTP software will read the data strings and also the PPS signals from the Hopf clock once per second and use this information to synchronize your server's system clock. For more details, see Dave Mill's excellent pages at http://www.eecis.udel.edu/~mills/database/brief/overview/overview.ppt etc. Paul ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions
Re: [ntp:questions] GPS and NTP Server
David Woolley [EMAIL PROTECTED] writes: For the most accurate time, you need to connect the PPS outputs, which seem to be separate from the RS 232 interface. (It's not worth downloading the manual to check this without the exact version information.) Hmm, isn't the PPS signal usually connected to one of the flow control pins? DES -- Dag-Erling Smørgrav - [EMAIL PROTECTED] ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions
Re: [ntp:questions] GPS and NTP Server
noosh wrote: Thank you for kind attention. I have GPS hopf 6842 which is connected Exactly which model? There are 7 different user manuals. to the NTP Server. i want to connect these 2 device(GPS to NTP Server) by serial port and then NTP Server should get the time from GPS. how For the most accurate time, you need to connect the PPS outputs, which seem to be separate from the RS 232 interface. (It's not worth downloading the manual to check this without the exact version information.) NTP Server sychronize itself with GPS which is connecte to its serial port then? According to the NTP documentation. Alternatively, I would guess you may be able to find someone who will support you at standard consultancy rates. This may give you some clues: http://www.hopf.com/software/products/ntp/README.REDHAT ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions
Re: [ntp:questions] GPS and NTP Server
Hallo Noosh, Yes, it's possible. What sort of GPS receiver do you have? For serious timekeeping, you should have a GPS with a PPS output signal; that can achieve accuracy much better than 1 millisec. Otherwise, you can configure the GPS to send NMEA sentences to the computer. The documentation page http://www.eecis.udel.edu/~mills/ntp/html/drivers/driver20.html gives details of the NTP configuration. You can find more documentation that will help to get you started at http://support.ntp.org/bin/view/Support/WebOrder. What sort of computer and operating system are you using? You may need to configure and compile the source files in order to include support for your refclock. If you ask us specific questions, we can help you better. Paul On Jan 30, 8:16 am, noosh [EMAIL PROTECTED] wrote: Hi I Have a GPS and NTP Server. is it possible for NTP server to get time from GPS if i connecte the server to GPS by serial port? if yes, how should do it? what should be the ntp.conf ? Thanks ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions
