[ntp:questions] Re: Errors with NMEA refclock
David J Taylor
david-taylor at blueyonder.co.not-this-bit.nor-this-part.uk.invalid
Mon Jan 30 17:48:43 UTC 2006
Terje Mathisen wrote:
> Harlan Stenn wrote:
>>>>> In article <43DD34D3.8000600 at ntp.isc.org>, mayer at ntp.isc.org
>>>>> (Danny Mayer) writes:
>> Niall> as far as I can tell only 4800 is supported with the default
>> Danny> If there's something wrong with the baud rates lets get it
>> fixed. We Danny> just have to know what's wrong.
>> There's a reason it's set to 4800. I don't know what the reason is,
>> but there is a reason.
> A very good reason indeed:
> 4800 baud is an intrinsic part of the NMEA spec! :-)
> All devices that talk NMEA do so at 4800.
You are, of course, correct. However, many devices /do/ allow higher
speeds (which would provide lower timekeeping jitter), but there is no
easy way to tell ntpd about the higher speed. I see that flag1 and flag4
are unused for this driver, so that might be a way to pass the port number
and baud rate under Windows. E.g. flag4 19200.
(Perhaps the port number is implied already by the unit number in the
More information about the questions