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79c2daa00SOllivier Robert		<title>Conrad parallel port radio clock</title>
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129c2daa00SOllivier Robert		<h3>Conrad parallel port radio clock</h3>
13*2b15cb3dSCy Schubert<p>Last update:
14*2b15cb3dSCy Schubert  <!-- #BeginDate format:En2m -->21-Oct-2010  23:44<!-- #EndDate -->
15*2b15cb3dSCy Schubert  UTC</p>
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179c2daa00SOllivier Robert		<h4>Synopsis</h4>
189c2daa00SOllivier Robert		<p>Address: 127.127.35.<i>u</i><br>
199c2daa00SOllivier Robert			Reference ID: <tt>PCF</tt><br>
209c2daa00SOllivier Robert			Driver ID: <tt>PCF</tt><br>
219c2daa00SOllivier Robert			Parallel Port: <tt>/dev/pcfclocks/<i>u</i></tt> or <tt>/dev/pcfclock<i>u</i></tt></p>
229c2daa00SOllivier Robert		<h4>Description</h4>
239c2daa00SOllivier Robert		<p>This driver supports the parallel port radio clock sold by <a href="http://www.conrad-electronic.com/">Conrad Electronic</a> under order numbers 967602 and 642002. This clock is put between a parallel port and your printer. It receives the legal German time, which is either CET or CEST, from the DCF77 transmitter and uses it to set its internal quartz clock. The DCF77 transmitter is located near to Frankfurt/Main and covers a radius of more than 1500 kilometers.</p>
249c2daa00SOllivier Robert		<p>The pcfclock device driver is required in order to use this reference clock driver. Currently device drivers for <a href="http://home.pages.de/%7evoegele/pcf.html">Linux</a> and <a href="http://schumann.cx/pcfclock/">FreeBSD</a> are available.</p>
259c2daa00SOllivier Robert		<p>This driver uses C library functions to convert the received timecode to UTC and thus requires that the local timezone be CET or CEST. If your server is not located in Central Europe you have to set the environment variable TZ to CET before starting <tt>ntpd</tt>.</p>
269c2daa00SOllivier Robert		<h4>Monitor Data</h4>
279c2daa00SOllivier Robert		<p>Each timecode is written to the <tt>clockstats</tt> file in the format <tt>YYYY MM DD HH MI SS</tt>.</p>
289c2daa00SOllivier Robert		<h4>Fudge Factors</h4>
299c2daa00SOllivier Robert		<dl>
309c2daa00SOllivier Robert			<dt><tt>time1 <i>time</i></tt>
319c2daa00SOllivier Robert			<dd>Specifies the time offset calibration factor, in seconds and fraction, with default 0.1725.
329c2daa00SOllivier Robert			<dt><tt>time2 <i>time</i></tt>
339c2daa00SOllivier Robert			<dd>Not used by this driver.
349c2daa00SOllivier Robert			<dt><tt>stratum <i>number</i></tt>
359c2daa00SOllivier Robert			<dd>Specifies the driver stratum, in decimal from 0 to 15, with default 0.
369c2daa00SOllivier Robert			<dt><tt>refid <i>string</i></tt>
379c2daa00SOllivier Robert			<dd>Specifies the driver reference identifier, an ASCII string from one to four characters, with default <tt>PCF</tt>.
389c2daa00SOllivier Robert			<dt><tt>flag1 0 | 1</tt>
399c2daa00SOllivier Robert			<dd>Not used by this driver.
409c2daa00SOllivier Robert			<dt><tt>flag2 0 | 1</tt>
419c2daa00SOllivier Robert			<dd>If set to 1, the radio clock's synchronisation status bit is ignored, ie the timecode is used without a check.
429c2daa00SOllivier Robert			<dt><tt>flag3 0 | 1</tt>
439c2daa00SOllivier Robert			<dd>Not used by this driver.
449c2daa00SOllivier Robert			<dt><tt>flag4 0 | 1</tt>
459c2daa00SOllivier Robert			<dd>Not used by this driver.
469c2daa00SOllivier Robert		</dl>
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