dist/ntp/html/drivers/driver34.html

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   6                 <title>Ultralink Clock</title>
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   8                 <link <link href="scripts/style.css" type="text/css" rel="stylesheet"> </HEAD> <BODY> <H3> Ultralink Clock</H3>
   9                 <hr>
  10                 <h4>Synopsis</h4>
  11                         Address: 127.127.34.<i>u</i><br>
  12                         Reference ID: <tt>WWVB</tt><br>
  13                         Driver ID: <tt>ULINK</tt><br>
  14                         Serial Port: <tt>/dev/wwvb<i>u</i></tt>; 9600 bps, 8-bits, no parity<br>
  15                 <br>
  16                         Features: <tt>(none)</tt>
  17                 <h4>Description</h4>
  18                 <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.<br>
  19                                 Leap second and quality are supported.</p>
  20                 <p>Most of this code is originally from refclock_wwvb.c with thanks. Any mistakes are mine. Any improvements are welcome.</p>
  21                 <hr>
  22                 <pre>  The Model 325 timecode format is:
  23
  24    &lt;cr&gt;&lt;lf&gt;RQ_1C00LYYYY+DDDUTCS_HH:MM:SSL+5
  25
  26   where:
  27
  28   R = Signal readability indicator, ranging from R1 to R5
  29   Q     R1 is unreadable, R5 is best reception
  30   _ = Space
  31   1 = prev. received data bit, values: 0, 1 ,M or ? unknown
  32   C = Signal reception from (C)olorado or (H)awaii
  33   0 = Hours since last WWVB time and flag code update, values
  34   0     00 to 99 (hopefully always 00)
  35   L = HEX A5 if receiver is locked to WWVB, Space if not
  36   YYYY = Year from 2000 to 2099
  37   + = '+' if current year is a leap year, else ' '
  38   DDD = current day in the year from 1 to 365/366
  39   UTC = timezone (always UTC)
  40   S = Daylight savings indicator, (S)TD, (D)ST, (O) transition
  41       into DST, (I) transition out of DST
  42   _ = Space
  43   HH = UTC hour 0 to 23
  44   : = Time delimiter, ':' if synced, Space if not
  45   MM = Minutes of current hour from 0 to 59
  46   : = Time delimiter, ':' if synced, Space if not
  47   SS = Seconds of current minute from 0 to 59
  48   mm = 10's milliseconds of the current second from 00 to 99
  49   L  = Leap second pending at end of month, (I)nsert, (D)elete
  50        or Space
  51   +5 = UT1 correction, +/- .1 sec increments
  52  </pre>
  53                 <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>
  54                 <hr>
  55                 <pre>  The Model 320 timecode format is:
  56
  57    &lt;cr&gt;&lt;lf&gt;SQRYYYYDDD+HH:MM:SS.mmLT&lt;cr&gt;
  58
  59   where:
  60
  61   S = 'S' -- sync'd in last hour, '0'-'9' - hours x 10 since last update, else '?'
  62   Q = Number of correlating time-frames, from 0 to 5
  63   R = 'R' -- reception in progress, 'N' -- Noisy reception, ' ' -- standby mode
  64   YYYY = year from 1990 to 2089
  65   DDD = current day from 1 to 366
  66   + = '+' if current year is a leap year, else ' '
  67   HH = UTC hour 0 to 23
  68   MM = Minutes of current hour from 0 to 59
  69   SS = Seconds of current minute from 0 to 59
  70   mm = 10's milliseconds of the current second from 00 to 99
  71   L  = Leap second pending at end of month -- 'I' = inset, 'D'=delete
  72   T  = DST &lt;-&gt; STD transition indicators
  73  </pre>
  74                 <p>Note that this driver does not do anything with the T flag.</p>
  75                 <p>The M320 also has a 'U' command which returns UT1 correction information. It is not used in this driver.</p>
  76                 <hr>
  77                 <pre>  The Model 33x timecode format is:
  78
  79     S9+D 00 YYYY+DDDUTCS HH:MM:SSl+5
  80
  81   Where:
  82
  83   S =    sync indicator S insync N not in sync
  84          the sync flag is WWVB decoder sync
  85          nothing to do with time being correct
  86   9+ =   signal level 0 thru 9+ If over 9 indicated as 9+
  87   D  =   data bit ( fun to watch but useless ;-)
  88   space
  89   00 =   hours since last GOOD WWVB frame sync
  90   space
  91   YYYY = current year
  92   +  =   leap year indicator
  93   DDD =  day of year
  94   UTC =  timezone (always UTC)
  95   S  =   daylight savings indicator
  96   space
  97   HH  =  hours
  98   :  =   This is the REAL in sync indicator (: = insync)
  99   MM  =  minutes
 100   :  =   : = in sync ? = NOT in sync
 101   SS  =  seconds
 102   L  =   leap second flag
 103   +5 =   UT1 correction (sign + digit ))
 104  </pre>
 105                 <p>This driver ignores UT1 correction,DST indicator,Leap year and signal level.</p>
 106                 <hr>
 107                 <h4>Fudge factors</h4>
 108                 <p>flag1 polling enable (1=poll 0=no poll)</p>
 109                 <hr>
 110                 <address><a href="mailto:frank.migge@oracle.com">mail</a></address>
 111                 <!-- hhmts start -->Last modified: Mon Mar 8 10:12:08 PST 2004<!-- hhmts end -->
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