external/bsd/ntp/dist/html/drivers/driver34.html

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   7                 <title>Ultralink Clock</title>
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  12                 <h3>Ultralink Clock</h3>
  13                 <hr>
  14                 <h4>Synopsis</h4>
  15                 <p>Address: 127.127.34.<i>u</i><br>
  16                                 Reference ID: <tt>WWVB</tt><br>
  17                                 Driver ID: <tt>ULINK</tt><br>
  18                                 Serial Port: <tt>/dev/wwvb<i>u</i></tt>; 9600 bps, 8-bits, no parity<br>
  19                                 Features: <tt>(none)</tt></p>
  20                 <h4>Description</h4>
  21                 <p>This driver supports the Ultralink Model 325 (replacement for Model 320) RS-232 powered WWVB receiver. PDF specs available on <a href="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>
  22                 <h4>Model 325 timecode format</h4>
  23                 <p><tt>&lt;cr&gt;&lt;lf&gt;RQ_1C00LYYYY+DDDUTCS_HH:MM:SSL+5</tt></p>
  24                 <p>R = Signal readability indicator, ranging from R1 to R5 Q R1 is unreadable, R5 is best reception<br>
  25                                 _ = Space<br>
  26                         1 = prev. received data bit, values: 0, 1 ,M or ? unknown
  27                 C = Signal reception from (C)olorado or (H)awaii 0 = Hours since last WWVB time and flag code update, values 0 00 to 99 (hopefully always 00)<br>
  28                                 L = HEX A5 if receiver is locked to WWVB, Space if not<br>
  29                                 YYYY = Year from 2000 to 2099<br>
  30                                 + = '+' if current year is a leap year, else ' '<br>
  31                                 DDD = current day in the year from 1 to 365/366<br>
  32                                 UTC = timezone (always UTC)<br>
  33                                 S = Daylight savings indicator, (S)TD, (D)ST, (O) transition into DST, (I) transition out of DST<br>
  34                                 _ = Space<br>
  35                                 HH = UTC hour 0 to 23<br>
  36                                 : = Time delimiter, ':' if synced, Space if not<br>
  37                    MM = Minutes of current hour from 0 to 59<br>
  38                                 : = Time delimiter, ':' if synced, Space if not<br>
  39                                 SS = Seconds of current minute from 0 to 59<br>
  40                                 mm = 10's milliseconds of the current second from 00 to 99<br>
  41                                 L = Leap second pending at end of month, (I)nsert, (D)elete or Space<br>
  42                                 +5 = UT1 correction, +/- .1 sec increments</p>
  43                 <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>
  44                 <h4>Model 320 timecode format</h4>
  45                 <p><tt>&lt;cr&gt;&lt;lf&gt;SQRYYYYDDD+HH:MM:SS.mmLT&lt;cr&gt;</tt></p>
  46                 <p>S = 'S' -- sync'd in last hour, '0'-'9' - hours x 10 since last update, else '?'<br>
  47                                 Q = Number of correlating time-frames, from 0 to 5<br>
  48                                 R = 'R' -- reception in progress,'N' -- Noisy reception, ' ' -- standby mode<br>
  49                                 YYYY = year from 1990 to 2089<br>
  50                                 DDD = current day from 1 to 366 + = '+' if current year is a leap year, else ' '<br>
  51                                 HH = UTC hour 0 to 23<br>
  52                                 MM = Minutes of current hour from 0 to 59<br>
  53                                 SS = Seconds of current minute from 0 to 59<br>
  54                                 mm = 10's milliseconds of the current second from 00 to 99<br>
  55                                 L = Leap second pending at end of month -- 'I' = insert, 'D'=delete<br>
  56                         T = DST &lt;-&gt; STD transition indicators</p>
  57                 <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>
  58                 <h4>Model 33x timecode format</h4>
  59                 <p><tt>S9+D 00 YYYY+DDDUTCS HH:MM:SSl+5</tt></p>
  60                 <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>
  61                 <p>9+ = signal level 0 thru 9+ If over 9 indicated as 9<br>
  62                                 D = data bit (fun to watch but useless ;-) space<br>
  63                                 00 = hours since last GOOD WWVB frame sync space<br>
  64                                 YYYY = current year + = leap year indicator<br>
  65                                 DDD = day of year<br>
  66                                 UTC = timezone (always UTC)<br>
  67                                 S = daylight savings indicator space<br>
  68                                 HH = hours : = This is the REAL in sync indicator (: = insync)<br>
  69                                 MM = minutes : = : = in sync ? = NOT in sync<br>
  70                                 SS = seconds<br>
  71                                 L = leap second flag<br>
  72                                 +5 = UT1 correction (sign + digit ))</p>
  73                 <p>This driver ignores UT1 correction, DST indicator,Leap year and signal level.</p>
  74                 <h4>Fudge factors</h4>
  75                 <p>flag1 polling enable (1=poll 0=no poll)</p>
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