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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN">
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<title>Conrad parallel port radio clock</title>
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<h3>Conrad parallel port radio clock</h3>
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<p>Address: 127.127.35.<i>u</i><br>
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Reference ID: <tt>PCF</tt><br>
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Driver ID: <tt>PCF</tt><br>
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Parallel Port: <tt>/dev/pcfclocks/<i>u</i></tt> or <tt>/dev/pcfclock<i>u</i></tt>
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<p>This driver supports the parallel port radio clock sold by
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<a href="http://www.conrad-electronic.com/">Conrad Electronic</a> under
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order numbers 967602 and 642002. This clock is put between a parallel
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port and your printer. It receives the legal German time, which is
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either CET or CEST, from the DCF77 transmitter and uses it to set its
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internal quartz clock. The DCF77 transmitter is located near to
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Frankfurt/Main and covers a radius of more than 1500 kilometers.
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<p>The pcfclock device driver is required in order to use this
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reference clock driver. Currently device drivers for
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<a href="http://home.pages.de/~voegele/pcf.html">Linux</a> and
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<a href="http://schumann.cx/pcfclock/">FreeBSD</a> are available.</p>
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<p>This driver uses C library functions to convert the received
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timecode to UTC and thus requires that the local timezone be CET or
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CEST. If your server is not located in Central Europe you have to set
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the environment variable TZ to CET before starting <tt>ntpd</tt>.
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<p>Each timecode is written to the <tt>clockstats</tt> file in the format
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<tt>YYYY MM DD HH MI SS</tt>.</p>
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<h4>Fudge Factors</h4>
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<dt><tt>time1 <i>time</i></tt></dt>
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<dd>Specifies the time offset calibration factor, in seconds and fraction,
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with default 0.1725.</dd>
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<dt><tt>time2 <i>time</i></tt></dt>
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<dd>Not used by this driver.</dd>
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<dt><tt>stratum <i>number</i></tt></dt>
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<dd>Specifies the driver stratum, in decimal from 0 to 15, with default 0.
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<dt><tt>refid <i>string</i></tt></dt>
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<dd>Specifies the driver reference identifier, an ASCII string from one to
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four characters, with default <tt>PCF</tt>.</dd>
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<dt><tt>flag1 0 | 1</tt></dt>
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<dd>Not used by this driver.</dd>
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<dt><tt>flag2 0 | 1</tt></dt>
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<dd>If set to 1, the radio clock's synchronisation status bit is
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ignored, ie the timecode is used without a check.</dd>
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<dt><tt>flag3 0 | 1</tt></dt>
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<dd>Not used by this driver.</dd>
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<dt><tt>flag4 0 | 1</tt></dt>
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<dd>Not used by this driver.</dd>
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<address>Andreas Voegele <voegelas@users.sourceforge.net></address>
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