117 lines
4.5 KiB
HTML
117 lines
4.5 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<html>
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<head>
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<title>Ultralink Clock</title>
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<meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1">
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<link <link href="scripts/style.css" type="text/css" rel="stylesheet"> </HEAD> <BODY> <H3> Ultralink Clock</H3>
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<hr>
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<h4>Synopsis</h4>
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Address: 127.127.34.<i>u</i><br>
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Reference ID: <tt>WWVB</tt><br>
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Driver ID: <tt>ULINK</tt><br>
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Serial Port: <tt>/dev/wwvb<i>u</i></tt>; 9600 bps, 8-bits, no parity<br>
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<br>
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Features: <tt>(none)</tt>
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<h4>Description</h4>
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<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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Leap second and quality are supported.</p>
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<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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<hr>
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<pre> The Model 325 timecode format is:
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<cr><lf>RQ_1C00LYYYY+DDDUTCS_HH:MM:SSL+5
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where:
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R = Signal readability indicator, ranging from R1 to R5
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Q R1 is unreadable, R5 is best reception
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_ = Space
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1 = prev. received data bit, values: 0, 1 ,M or ? unknown
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C = Signal reception from (C)olorado or (H)awaii
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0 = Hours since last WWVB time and flag code update, values
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0 00 to 99 (hopefully always 00)
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L = HEX A5 if receiver is locked to WWVB, Space if not
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YYYY = Year from 2000 to 2099
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+ = '+' if current year is a leap year, else ' '
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DDD = current day in the year from 1 to 365/366
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UTC = timezone (always UTC)
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S = Daylight savings indicator, (S)TD, (D)ST, (O) transition
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into DST, (I) transition out of DST
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_ = Space
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HH = UTC hour 0 to 23
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: = Time delimiter, ':' if synced, Space if not
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MM = Minutes of current hour from 0 to 59
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: = Time delimiter, ':' if synced, Space if not
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SS = Seconds of current minute from 0 to 59
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mm = 10's milliseconds of the current second from 00 to 99
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L = Leap second pending at end of month, (I)nsert, (D)elete
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or Space
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+5 = UT1 correction, +/- .1 sec increments
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</pre>
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<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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<hr>
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<pre> The Model 320 timecode format is:
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<cr><lf>SQRYYYYDDD+HH:MM:SS.mmLT<cr>
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where:
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S = 'S' -- sync'd in last hour, '0'-'9' - hours x 10 since last update, else '?'
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Q = Number of correlating time-frames, from 0 to 5
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R = 'R' -- reception in progress, 'N' -- Noisy reception, ' ' -- standby mode
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YYYY = year from 1990 to 2089
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DDD = current day from 1 to 366
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+ = '+' if current year is a leap year, else ' '
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HH = UTC hour 0 to 23
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MM = Minutes of current hour from 0 to 59
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SS = Seconds of current minute from 0 to 59
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mm = 10's milliseconds of the current second from 00 to 99
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L = Leap second pending at end of month -- 'I' = inset, 'D'=delete
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T = DST <-> STD transition indicators
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</pre>
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<p>Note that this driver does not do anything with the T flag.</p>
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<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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<hr>
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<pre> The Model 33x timecode format is:
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S9+D 00 YYYY+DDDUTCS HH:MM:SSl+5
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Where:
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S = sync indicator S insync N not in sync
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the sync flag is WWVB decoder sync
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nothing to do with time being correct
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9+ = signal level 0 thru 9+ If over 9 indicated as 9+
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D = data bit ( fun to watch but useless ;-)
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space
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00 = hours since last GOOD WWVB frame sync
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space
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YYYY = current year
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+ = leap year indicator
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DDD = day of year
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UTC = timezone (always UTC)
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S = daylight savings indicator
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space
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HH = hours
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: = This is the REAL in sync indicator (: = insync)
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MM = minutes
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: = : = in sync ? = NOT in sync
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SS = seconds
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L = leap second flag
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+5 = UT1 correction (sign + digit ))
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</pre>
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<p>This driver ignores UT1 correction,DST indicator,Leap year and signal level.</p>
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<hr>
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<h4>Fudge factors</h4>
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<p>flag1 polling enable (1=poll 0=no poll)</p>
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<hr>
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<address><a href="mailto:frank.migge@oracle.com">mail</a></address>
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<!-- hhmts start -->Last modified: Mon Mar 8 10:12:08 PST 2004<!-- hhmts end -->
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<hr>
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<script type="text/javascript" language="javascript" src="Ultralink Clock_files/footer.txt"></script>
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</BODY>
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</head>
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</html> |