<p>This driver supports the Ultralink Model 325 (replacement for Model 320) RS-232 powered WWVB receiver. PDF specs available on <ahref="http://www.ulio.com/">http://www.ulio.com/</a>. This driver also supports the Model 320, 330,331,332 decoders in both polled or continous time code mode.Leap second and quality are supported. Most of this code is originally from refclock_wwvb.c with thanks. Any mistakes are mine. Any improvements are welcome.</p>
<p>Note that Model 325 reports a very similar output like Model 33X series. The driver for this clock is similar to Model 33X behavior. On a unmodified new ULM325 clock, the polling flag (flag1 =1) needs to be set.</p>
<p>S = 'S' -- sync'd in last hour, '0'-'9' - hours x 10 since last update, else '?'<br>
Q = Number of correlating time-frames, from 0 to 5<br>
R = 'R' -- reception in progress,'N' -- Noisy reception, ' ' -- standby mode<br>
YYYY = year from 1990 to 2089<br>
DDD = current day from 1 to 366 + = '+' if current year is a leap year, else ' '<br>
HH = UTC hour 0 to 23<br>
MM = Minutes of current hour from 0 to 59<br>
SS = Seconds of current minute from 0 to 59<br>
mm = 10's milliseconds of the current second from 00 to 99<br>
L = Leap second pending at end of month -- 'I' = insert, 'D'=delete<br>
T = DST <-> STD transition indicators</p>
<p>Note that this driver does not do anything with the T flag. The M320 also has a 'U' command which returns UT1 correction information. It is not used in this driver.</p>
<h4>Model 33x timecode format</h4>
<p><tt>S9+D 00 YYYY+DDDUTCS HH:MM:SSl+5</tt></p>
<p>S = sync indicator S insync N not in sync the sync flag is WWVB decoder sync nothing to do with time being correct </p>
<p>9+ = signal level 0 thru 9+ If over 9 indicated as 9<br>
D = data bit (fun to watch but useless ;-) space<br>
00 = hours since last GOOD WWVB frame sync space<br>
YYYY = current year + = leap year indicator<br>
DDD = day of year<br>
UTC = timezone (always UTC)<br>
S = daylight savings indicator space<br>
HH = hours : = This is the REAL in sync indicator (: = insync)<br>
MM = minutes : = : = in sync ? = NOT in sync<br>
SS = seconds<br>
L = leap second flag<br>
+5 = UT1 correction (sign + digit ))</p>
<p>This driver ignores UT1 correction, DST indicator,Leap year and signal level.</p>
