1
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
6
<meta http-equiv="Content-Type" content="text/html; charset=iso8859-1">
7
<title>Ultralink Clock</title>
8
<link href="../scripts/style.css" type="text/css" rel="stylesheet">
12
<h3>Ultralink Clock</h3>
15
Address: 127.127.34.<i>u</i><br>
16
Reference ID: <tt>WWVB</tt><br>
17
Driver ID: <tt>ULINK</tt><br>
18
Serial Port: <tt>/dev/wwvb<i>u</i></tt>; 9600 bps, 8-bits, no parity<br>
20
Features: <tt>(none)</tt>
22
<p>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>
23
<p>Most of this code is originally from refclock_wwvb.c with thanks. Any mistakes are mine. Any improvements are welcome.</p>
26
The Model 320 timecode format is:
28
<cr><lf>SQRYYYYDDD+HH:MM:SS.mmLT<cr>
32
S = 'S' -- sync'd in last hour, '0'-'9' - hours x 10 since last update, else '?'
33
Q = Number of correlating time-frames, from 0 to 5
34
R = 'R' -- reception in progress, 'N' -- Noisy reception, ' ' -- standby mode
35
YYYY = year from 1990 to 2089
36
DDD = current day from 1 to 366
37
+ = '+' if current year is a leap year, else ' '
39
MM = Minutes of current hour from 0 to 59
40
SS = Seconds of current minute from 0 to 59
41
mm = 10's milliseconds of the current second from 00 to 99
42
L = Leap second pending at end of month -- 'I' = inset, 'D'=delete
43
T = DST <-> STD transition indicators
45
<p>Note that this driver does not do anything with the T flag.</p>
46
<p>The M320 also has a 'U' command which returns UT1 correction information. It is not used in this driver.</p>
49
The Model 33x timecode format is:
51
S9+D 00 YYYY+DDDUTCS HH:MM:SSl+5
55
S = sync indicator S insync N not in sync
56
the sync flag is WWVB decoder sync
57
nothing to do with time being correct
58
9+ = signal level 0 thru 9+ If over 9 indicated as 9+
59
D = data bit ( fun to watch but useless ;-)
61
00 = hours since last GOOD WWVB frame sync
64
+ = leap year indicator
66
UTC = timezone (always UTC)
67
S = daylight savings indicator
70
: = This is the REAL in sync indicator (: = insync)
72
: = : = in sync ? = NOT in sync
75
+5 = UT1 correction (sign + digit ))
77
<p>This driver ignores UT1 correction,DST indicator,Leap year and signal level.</p>
79
<h4>Fudge factors</h4>
80
<p>flag1 polling enable (1=poll 0=no poll)</p>
82
<address><a href="mailto:dstrout@linuxfoundary.com">mail</a></address>
83
<!-- hhmts start -->Last modified: Tue Sep 14 05:53:08 EDT 1999 <!-- hhmts end -->
85
<script type="text/javascript" language="javascript" src="../scripts/footer.txt"></script>
b'\\ No newline at end of file'
added
removed
html/drivers/driver34.html
