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 0000 Mode byte 2: binary 0000 0000 Status and pulse output: binary 0000 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
