/contrib/ntp/html/drivers/driver34.html

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  1. <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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  3. <html>
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  5. 	<head>
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  6. 		<title>Ultralink Clock</title>
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  7. 		<meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1">
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  8. 		<link <link href="scripts/style.css" type="text/css" rel="stylesheet"> </HEAD> <BODY> <H3> Ultralink Clock</H3>
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  9. 		<hr>
    10. 

  10. 		<h4>Synopsis</h4>
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  11. 			Address: 127.127.34.<i>u</i><br>
    12. 

  12. 			Reference ID: <tt>WWVB</tt><br>
    13. 

  13. 			Driver ID: <tt>ULINK</tt><br>
    14. 

  14. 			Serial Port: <tt>/dev/wwvb<i>u</i></tt>; 9600 bps, 8-bits, no parity<br>
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  15. 		<br>
    16. 

  16. 			Features: <tt>(none)</tt>
    17. 

  17. 		<h4>Description</h4>
    18. 

  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>
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  19. 				Leap second and quality are supported.</p>
    20. 

  20. 		<p>Most of this code is originally from refclock_wwvb.c with thanks. Any mistakes are mine. Any improvements are welcome.</p>
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  21. 		<hr>
    22. 

  22. 		<pre>  The Model 325 timecode format is:
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  23.  
    24. 

  24.    &lt;cr&gt;&lt;lf&gt;RQ_1C00LYYYY+DDDUTCS_HH:MM:SSL+5
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  25.  
    26. 

  26.   where:
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  27.  
    28. 

  28.   R = Signal readability indicator, ranging from R1 to R5  
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  29.   Q	R1 is unreadable, R5 is best reception
    30. 

  30.   _ = Space
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  31.   1 = prev. received data bit, values: 0, 1 ,M or ? unknown
    32. 

  32.   C = Signal reception from (C)olorado or (H)awaii
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  33.   0 = Hours since last WWVB time and flag code update, values
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  34.   0	00 to 99 (hopefully always 00)
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  35.   L = HEX A5 if receiver is locked to WWVB, Space if not
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  36.   YYYY = Year from 2000 to 2099
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  37.   + = '+' if current year is a leap year, else ' '
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  38.   DDD = current day in the year from 1 to 365/366
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  39.   UTC = timezone (always UTC)
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  40.   S = Daylight savings indicator, (S)TD, (D)ST, (O) transition
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  41.       into DST, (I) transition out of DST
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  42.   _ = Space
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  43.   HH = UTC hour 0 to 23
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  44.   : = Time delimiter, ':' if synced, Space if not
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  45.   MM = Minutes of current hour from 0 to 59
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  46.   : = Time delimiter, ':' if synced, Space if not
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  47.   SS = Seconds of current minute from 0 to 59
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  48.   mm = 10's milliseconds of the current second from 00 to 99
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  49.   L  = Leap second pending at end of month, (I)nsert, (D)elete
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  50.        or Space
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  51.   +5 = UT1 correction, +/- .1 sec increments
    52. 

  52.  </pre>
    53. 

  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>
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  54. 		<hr>
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  55. 		<pre>  The Model 320 timecode format is:
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  56.  
    57. 

  57.    &lt;cr&gt;&lt;lf&gt;SQRYYYYDDD+HH:MM:SS.mmLT&lt;cr&gt;
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  58.  
    59. 

  59.   where:
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  60.  
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  61.   S = 'S' -- sync'd in last hour, '0'-'9' - hours x 10 since last update, else '?'
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  62.   Q = Number of correlating time-frames, from 0 to 5
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  63.   R = 'R' -- reception in progress, 'N' -- Noisy reception, ' ' -- standby mode
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  64.   YYYY = year from 1990 to 2089
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  65.   DDD = current day from 1 to 366
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  66.   + = '+' if current year is a leap year, else ' '
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  67.   HH = UTC hour 0 to 23
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  68.   MM = Minutes of current hour from 0 to 59
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  69.   SS = Seconds of current minute from 0 to 59
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  70.   mm = 10's milliseconds of the current second from 00 to 99
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  71.   L  = Leap second pending at end of month -- 'I' = inset, 'D'=delete
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  72.   T  = DST &lt;-&gt; STD transition indicators
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  73.  </pre>
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  74. 		<p>Note that this driver does not do anything with the T flag.</p>
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  75. 		<p>The M320 also has a 'U' command which returns UT1 correction information. It is not used in this driver.</p>
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  76. 		<hr>
    77. 

  77. 		<pre>  The Model 33x timecode format is:
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  78. 

  79.     S9+D 00 YYYY+DDDUTCS HH:MM:SSl+5
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  80. 

  81.   Where:
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  82. 

  83.   S =    sync indicator S insync N not in sync
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  84.          the sync flag is WWVB decoder sync
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  85.          nothing to do with time being correct
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  86.   9+ =   signal level 0 thru 9+ If over 9 indicated as 9+
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  87.   D  =   data bit ( fun to watch but useless ;-)
    88. 

  88.   space
    89. 

  89.   00 =   hours since last GOOD WWVB frame sync
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  90.   space
    91. 

  91.   YYYY = current year
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  92.   +  =   leap year indicator
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  93.   DDD =  day of year
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  94.   UTC =  timezone (always UTC)
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  95.   S  =   daylight savings indicator
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  96.   space
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  97.   HH  =  hours
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  98.   :  =   This is the REAL in sync indicator (: = insync)
    99. 

  99.   MM  =  minutes
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  100.   :  =   : = in sync ? = NOT in sync
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  101.   SS  =  seconds
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  102.   L  =   leap second flag
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  103.   +5 =   UT1 correction (sign + digit ))
    104. 

  104.  </pre>
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  105. 		<p>This driver ignores UT1 correction,DST indicator,Leap year and signal level.</p>
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  106. 		<hr>
    107. 

  107. 		<h4>Fudge factors</h4>
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  108. 		<p>flag1 polling enable (1=poll 0=no poll)</p>
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  109. 		<hr>
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  110. 		<address><a href="mailto:frank.migge@oracle.com">mail</a></address>
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  111. 		<!-- hhmts start -->Last modified: Mon Mar 8 10:12:08 PST 2004<!-- hhmts end -->
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  112. 		<hr>
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  113. 		<script type="text/javascript" language="javascript" src="Ultralink Clock_files/footer.txt"></script>
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  114. 		</BODY>
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  115. 	</head>
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  117. </html>
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