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  5	<head>
  6		<title>Ultralink Clock</title>
  7		<meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1">
  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 -->
112		<hr>
113		<script type="text/javascript" language="javascript" src="Ultralink Clock_files/footer.txt"></script>
114		</BODY>
115	</head>
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