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-<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
-<html> <head>
-<meta http-equiv="Content-Type" content="text/html; charset=iso8859-1">
-<title>Ultralink Clock</title>
-</head>
-
-<body>
-<h3>Ultralink Clock</h3>
-
-<hr>
-<h4>Synopsis</h4>
-Address: 127.127.34.<i>u</i><br>
-Reference ID: <TT>WWVB</TT><br>
-Driver ID: <tt>ULINK</tt><br>
-Serial Port: <tt>/dev/wwvb<i>u</i></tt>; 9600 bps, 8-bits,
-no parity<br>
-<br>Features: <tt>(none)</tt>
-<h4>Description</h4>
-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>.
-This driver also supports the Model 330,331,332 decoders in both polled or continous time code mode. Leap second and quality are supported.
-
-<P>Most of this code is originally from refclock_wwvb.c with thanks. Any mistakes are mine. Any improvements are welcome.
-<hr>
-<pre>
- The Model 320 timecode format is:
-
- <cr><lf>SQRYYYYDDD+HH:MM:SS.mmLT<cr>
-
- where:
-
- S = 'S' -- sync'd in last hour, '0'-'9' - hours x 10 since last update, else '?'
- Q = Number of correlating time-frames, from 0 to 5
- R = 'R' -- reception in progress, 'N' -- Noisy reception, ' ' -- standby mode
- YYYY = year from 1990 to 2089
- DDD = current day from 1 to 366
- + = '+' if current year is a leap year, else ' '
- HH = UTC hour 0 to 23
- MM = Minutes of current hour from 0 to 59
- SS = Seconds of current minute from 0 to 59
- mm = 10's milliseconds of the current second from 00 to 99
- L = Leap second pending at end of month -- 'I' = inset, 'D'=delete
- T = DST <-> STD transition indicators
-
- Note that this driver does not do anything with the T flag.
-
- The M320 also has a 'U' command which returns UT1 correction information.
- It is not used in this driver.
-</pre>
-<hr>
-<pre>
- The Model 33x timecode format is:
-
- S9+D 00 YYYY+DDDUTCS HH:MM:SSl+5
-
- Where:
-
- S = sync indicator S insync N not in sync
- the sync flag is WWVB decoder sync
- nothing to do with time being correct
- 9+ = signal level 0 thru 9+ If over 9 indicated as 9+
- D = data bit ( fun to watch but useless ;-)
- space
- 00 = hours since last GOOD WWVB frame sync
- space
- YYYY = current year
- + = leap year indicator
- DDD = day of year
- UTC = timezone (always UTC)
- S = daylight savings indicator
- space
- HH = hours
- : = This is the REAL in sync indicator (: = insync)
- MM = minutes
- : = : = in sync ? = NOT in sync
- SS = seconds
- L = leap second flag
- +5 = UT1 correction (sign + digit ))
-
- This driver ignores UT1 correction,DST indicator,Leap year
- and signal level.
-
-</pre>
-<hr>
-<pre>
-
-Fudge factors
- flag1 polling enable (1=poll 0=no poll)
-
-
-</pre>
-<hr>
- <address><a href="mailto:dstrout@linuxfoundary.com">mail</a></address>
-<!-- hhmts start -->
-Last modified: Tue Sep 14 05:53:08 EDT 1999
-<!-- hhmts end -->
-</body> </html>
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