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97 lines
2.8 KiB
HTML
97 lines
2.8 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
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<html> <head>
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<meta http-equiv="Content-Type" content="text/html; charset=iso8859-1">
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<title>Ultralink Clock</title>
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</head>
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<body>
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<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,
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no parity<br>
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<br>Features: <tt>(none)</tt>
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<h4>Description</h4>
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This driver supports the Ultralink Model 320 RS-232 powered WWVB receiver. PDF specs available on <a href="http://www.ulio.com">www.ulio.com</a>.
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This driver also supports the Model 330,331,332 decoders in both polled or continous time code mode. Leap second and quality are supported.
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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.
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<hr>
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<pre>
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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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Note that this driver does not do anything with the T flag.
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The M320 also has a 'U' command which returns UT1 correction information.
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It is not used in this driver.
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</pre>
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<hr>
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<pre>
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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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This driver ignores UT1 correction,DST indicator,Leap year
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and signal level.
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</pre>
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<hr>
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<pre>
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Fudge factors
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flag1 polling enable (1=poll 0=no poll)
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</pre>
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<hr>
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<address><a href="mailto:dstrout@linuxfoundary.com">mail</a></address>
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<!-- hhmts start -->
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Last modified: Tue Sep 14 05:53:08 EDT 1999
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<!-- hhmts end -->
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</body> </html>
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