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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>Ultralink Clock</title>
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<h3>Ultralink Clock</h3>
<hr>
<h4>Synopsis</h4>
Address: 127.127.34.<i>u</i><br>
Reference ID: <tt>WWVB</tt><br>
Driver ID: <tt>ULINK</tt><br>
Serial Port: <tt>/dev/wwvb<i>u</i></tt>; 9600 bps, 8-bits, no parity<br>
<br>
Features: <tt>(none)</tt>
<h4>Description</h4>
<p>This driver supports the Ultralink Model 320 RS-232 powered WWVB receiver. PDF specs available on <a href="http://www.ulio.com">www.ulio.com</a>. This driver also supports the Model 330,331,332 decoders in both polled or continous time code mode. Leap second and quality are supported.</p>
<p>Most of this code is originally from refclock_wwvb.c with thanks. Any mistakes are mine. Any improvements are welcome.</p>
<hr>
<pre>
The Model 320 timecode format is:
<cr><lf>SQRYYYYDDD+HH:MM:SS.mmLT<cr>
where:
S = 'S' -- sync'd in last hour, '0'-'9' - hours x 10 since last update, else '?'
Q = Number of correlating time-frames, from 0 to 5
R = 'R' -- reception in progress, 'N' -- Noisy reception, ' ' -- standby mode
YYYY = year from 1990 to 2089
DDD = current day from 1 to 366
+ = '+' if current year is a leap year, else ' '
HH = UTC hour 0 to 23
MM = Minutes of current hour from 0 to 59
SS = Seconds of current minute from 0 to 59
mm = 10's milliseconds of the current second from 00 to 99
L = Leap second pending at end of month -- 'I' = inset, 'D'=delete
T = DST <-> STD transition indicators
</pre>
<p>Note that this driver does not do anything with the T flag.</p>
<p>The M320 also has a 'U' command which returns UT1 correction information. It is not used in this driver.</p>
<hr>
<pre>
The Model 33x timecode format is:
S9+D 00 YYYY+DDDUTCS HH:MM:SSl+5
Where:
S = sync indicator S insync N not in sync
the sync flag is WWVB decoder sync
nothing to do with time being correct
9+ = signal level 0 thru 9+ If over 9 indicated as 9+
D = data bit ( fun to watch but useless ;-)
space
00 = hours since last GOOD WWVB frame sync
space
YYYY = current year
+ = leap year indicator
DDD = day of year
UTC = timezone (always UTC)
S = daylight savings indicator
space
HH = hours
: = This is the REAL in sync indicator (: = insync)
MM = minutes
: = : = in sync ? = NOT in sync
SS = seconds
L = leap second flag
+5 = UT1 correction (sign + digit ))
</pre>
<p>This driver ignores UT1 correction,DST indicator,Leap year and signal level.</p>
<hr>
<h4>Fudge factors</h4>
<p>flag1 polling enable (1=poll 0=no poll)</p>
<hr>
<address><a href="mailto:dstrout@linuxfoundary.com">mail</a></address>
<!-- hhmts start -->Last modified: Tue Sep 14 05:53:08 EDT 1999 <!-- hhmts end -->
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