[ntp:questions] Meinberg DCF77 C51 with Linux 2.6

Uwe Klein uwe_klein_habertwedt at t-online.de
Sat Feb 10 18:55:17 UTC 2007

Rune Magnussen wrote:
> Hi.
> I am trying to to get my Meinberg DCF77 C51 unit to work. The problem is
> that ntpd does not see any timecodes even though thr unit is synchronised
> to the radiosignal.
> The clock is connected via a modem cable with a null-modem
> adapter. I tried with a serial printer cable as well, but not for long. The
> serial port is detected by the kernel. As described in the docs I made a 
> symlink /dev/refclock-0 to /dev/ttyS0. I guess that /dev/ttyS0 is the right one.
> as the PC only has one serial port on the outside.
> The DCF77 C51 shows up as GENERIC(0) with refid DCFa but the clock is never
> "reached". I have activated clockstats in ntpd, but nothing shows up.

The Meinberg box has a db25 connector? right?

you need:

Meinberg(db25)		PC(db9 female)
TXD	3		RXD	2
RXD	2		TXD	3

i don't know about Handshake signals
There used to be Mouse Adapters DB25 mouse to DB9 PC


More information about the questions mailing list