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<th colspan="3" align="center">LPRng Reference Manual: 24
Sep 2004 (For LPRng-3.8.28)</th>
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<h1 class="SECT1"><a name="AEN6254" id="AEN6254">12.21. Duplex
Printing</a></h1>
<p>Duplex printing is when you print on both sides of a page.
Some printers which do duplex printing require that you send
them special commands to force this mode. This is usually done
by the FILTERS. The <b class="APPLICATION">ifhp</b> filter
makes a stab at sending the PJL or PostScript commands to the
printer. Many people have reported problems doing duplex
printing, so here is a check list.</p>
<ol type="1">
<li>
<p>Make sure you have enough memory for the worst case
print job. Usually the printer has to rasterize both pages
before it can produce an impression. It may require much
more memory than you expect.</p>
</li>
<li>
<p>Check your printer manual to discover the EXACT form of
the <tt class="LITERAL">enter duplex mode</tt> command and
make sure that either the command is part of the job (PJL
language at the start of the job, postscript header, etc),
or that the filter generates the correct form.</p>
<p>Note there is a PostScript Printer Description file
(PPD) for most printers that support PostScript, and they
even have the PJL and PostScript code for this in the PPD
file.</p>
</li>
<li>
<p>It has been observed that even with what would
apparently be sufficient memory, that many duplex jobs
print 'oddly', that they are not aligned on the same side
in the same way, etc etc. This may not be the fault of the
software, but of the support for duplex operation.</p>
</li>
<li>
<p>Read the <b class="APPLICATION">ifhp</b> documentation,
and create a configuration section in the <tt class=
"FILENAME">ifhp.conf</tt> file for your printer.</p>
</li>
</ol>
<p>I know this is painful, but until there is a uniform way to
get the correct commands extracted from either PPD or some
other database then this appears to be the only way to do it.
<a name="AEN6272" id="AEN6272"></a></p>
<blockquote class="BLOCKQUOTE">
<p><span class="emphasis"><i class="EMPHASIS">Patrick
Powell</i></span></p>
</blockquote>
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