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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>Dumb Clock</title>
</head>
<body>
<h3>Ultralink Clock</h3>
<hr>
<h4>Synopsis</h4>
Address: 127.127.34.<i>u</i><br>
Reference ID: <TT>ULINK</TT><br>
Driver ID: <tt>ULINK</tt><br>
Serial Port: <tt>/dev/ulink<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.linuxfoundary.com">www.linuxfoundary.com</a>. While the unit may support them, this driver does nothing with leap seconds, quality codes, etc. (though it probably should).
<P>Most of this code is originally from refclock_wwvb.c with thanks. Any mistakes are mine. Any improvements are welcome.
<pre>
The 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 L or T flags.
The M320 also has a 'U' command which returns UT1 correction information. It
is not used in this driver.
</pre>
<hr>
<address><a href="mailto:dstrout@linuxfoundary.com">root</a></address>
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Last modified: Tue Sep 14 05:53:08 EDT 1999
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