[ntp:questions] Meinberg DCF77 C51 with Linux 2.6

Rune Magnussen rum at gratismail.dk
Mon Feb 12 16:16:41 UTC 2007

Den Mon, 12 Feb 2007 10:47:35 +0100. skrev Martin Burnicki:

> 2.) You need a straight RS-232 cable with 25-to-9 adapter to connect the
> device, _not_ a null modem cable. As already mentioned in some other
> post here, you may _not_ compare the pin numbers of a 9 pin connector to
> those of a 25 pin connector to find out whether to use a cross over
> cable or a straight cable. The clock basically only requires a 2 wire
> connection, i.e. the clock's TxD connected to the PC's RxD, and the
> signal ground connected.
Ok. I'll get such at cable.

> 4.) You can use the cu program which is part of the uucp package 

I tries cu as someone else mentioned it. In my distro it seems to work as

> 5.) The clock's serial communication works regardless of whether it is
> synchronized, or not. 

Fine. that will give me a lot more chances to test things.

[snip - testing]

>> 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 above looks OK. I think your problems are just due to a wrong serial
> connection.
> Martin

Finally some very precise answers. Thanks!


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