[ntp:questions] Re: Errors with NMEA refclock

Danny Mayer mayer at ntp.isc.org
Mon Jan 30 19:28:19 UTC 2006

John Pettitt wrote:
> Danny Mayer wrote:
>> David J Taylor wrote:
>>> 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 
>>> address?)
>>> David 
>> If the specific baud rate is defined in the spec then we shouldn't be
>> providing knobs to turn to change it.
>> Danny
> Why?  If NMEA devices allow the default to be changed it seems reasonable that the driver should
> too.  I don't see a downside to allowing the data rate to be changed.
> John

That's part of the question that's not clear to me. It's one thing if
it's only designed for one baud rate, it's something else if the spec
allows for other baud rates.


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