[ntp:questions] Meinberg DCF77 C51 with Linux 2.6

Rune Magnussen rum at gratismail.dk
Sat Feb 10 19:56:24 UTC 2007


Den Sat, 10 Feb 2007 19:35:08 +0000. skrev Maurice Janssen:

> On Sat, 10 Feb 2007 19:55:31 +0100, Rune Magnussen wrote:
>>Den Sat, 10 Feb 2007 18:29:15 +0000. skrev Maurice Janssen:
>>
>>> 
>>> Have you tried without the null-modem cable?  IIRC you need a straight
>>> cable (like you would use between computer and external modem).
>>
>>Yes. Since it did not work I contacted Meinberg and found out that I
>>needed a cable with pins 2 and 3 crossed. That is a null-modem cable right?
> 
> That depends on the type of connector (25 or 9 pins), they don't have
> the same order (pin 2 and 3 are switched, just to make things more
> complex).
> 
> Looking at the data sheet of the C51, pin 3 is the TX pin.  On a 9 pin
> serial port on the PC, this needs to be connected to pin 2 (RX).
> But this is not a null-modem cable but a straight cable.
> 
> The standard setting for the C51 is rather unusual (7E2) compared to the
> more common setting (8N1).  Perhaps that is the problem?

Ok. I will try with an other cable. Perhaps I was just impatient waiting
for a good signal. The PARSE-driver with mode 2 expects the serial line to
use 7E2 according to
http://www.eecis.udel.edu/~mills/ntp/html/drivers/driver8.html

Regards Rune




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