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4 <title>Ultralink Clock</title>
8 <h3>Ultralink Clock</h3>
12 Address: 127.127.34.<i>u</i><br>
13 Reference ID: <TT>WWVB</TT><br>
14 Driver ID: <tt>ULINK</tt><br>
15 Serial Port: <tt>/dev/wwvb<i>u</i></tt>; 9600 bps, 8-bits,
17 <br>Features: <tt>(none)</tt>
19 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>.
20 This driver also supports the Model 330,331,332 decoders in both polled or continous time code mode. Leap second and quality are supported.
22 <P>Most of this code is originally from refclock_wwvb.c with thanks. Any mistakes are mine. Any improvements are welcome.
25 The Model 320 timecode format is:
27 <cr><lf>SQRYYYYDDD+HH:MM:SS.mmLT<cr>
31 S = 'S' -- sync'd in last hour, '0'-'9' - hours x 10 since last update, else '?'
32 Q = Number of correlating time-frames, from 0 to 5
33 R = 'R' -- reception in progress, 'N' -- Noisy reception, ' ' -- standby mode
34 YYYY = year from 1990 to 2089
35 DDD = current day from 1 to 366
36 + = '+' if current year is a leap year, else ' '
38 MM = Minutes of current hour from 0 to 59
39 SS = Seconds of current minute from 0 to 59
40 mm = 10's milliseconds of the current second from 00 to 99
41 L = Leap second pending at end of month -- 'I' = inset, 'D'=delete
42 T = DST <-> STD transition indicators
44 Note that this driver does not do anything with the T flag.
46 The M320 also has a 'U' command which returns UT1 correction information.
47 It is not used in this driver.
51 The Model 33x timecode format is:
53 S9+D 00 YYYY+DDDUTCS HH:MM:SSl+5
57 S = sync indicator S insync N not in sync
58 the sync flag is WWVB decoder sync
59 nothing to do with time being correct
60 9+ = signal level 0 thru 9+ If over 9 indicated as 9+
61 D = data bit ( fun to watch but useless ;-)
63 00 = hours since last GOOD WWVB frame sync
66 + = leap year indicator
68 UTC = timezone (always UTC)
69 S = daylight savings indicator
72 : = This is the REAL in sync indicator (: = insync)
74 : = : = in sync ? = NOT in sync
77 +5 = UT1 correction (sign + digit ))
79 This driver ignores UT1 correction,DST indicator,Leap year
87 flag1 polling enable (1=poll 0=no poll)
92 <address><a href="mailto:dstrout@linuxfoundary.com">mail</a></address>
94 Last modified: Tue Sep 14 05:53:08 EDT 1999