freebsd-nq/contrib/ntp/html/driver33.htm
1999-12-09 13:01:21 +00:00

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<title>Dumb Clock</title>
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<h3>Dumb Clock</h3>
<hr>
<h4>Synopsis</h4>
Address: 127.127.33.<i>u</i><br>
Reference ID: <TT>DUMBCLOCK</TT><br>
Driver ID: <tt>DUMBCLOCK</tt><br>
Serial Port: <tt>/dev/dumbclock<i>u</i></tt>; 9600 bps, 8-bits,
no parity<br>
<br>Features: <tt>(none)</tt>
<h4>Description</h4>
This driver supports a dumb ASCII clock that only emits localtime at a reliable
interval. This has no provisions for leap seconds, quality codes,
etc. It assumes output in the local time zone, and that the C library
mktime()/localtime() routines will correctly convert back and forth
between local and UTC.
<P>Most of this code is originally from refclock_wwvb.c with thanks. It
has been so mangled that wwvb is not a recognizable ancestor.
<pre>
Timecode format: hh:mm:ssCL
hh:mm:ss - local time
C - \r (carriage return)
L - \n (newline)
</pre>
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<address></address>
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Last modified: Sun Feb 14 12:07:01 EST 1999
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