sane-project-website/old-archive/1998-07/0071.html

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<title>sane-devel: Re: raw parallel device Q</title>
<h1>Re: raw parallel device Q</h1>
<b>Raymond A. Ingles</b> (<a href="mailto:inglesra@frc.com"><i>inglesra@frc.com</i></a>)<br>
<i>Thu, 16 Jul 1998 13:40:28 -0400 (EDT)</i>
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On Thu, 16 Jul 1998, Ian Grant wrote:<br>
<p>
<i>&gt; On Thu, 16 Jul 1998, Andreas Dilger wrote:</i><br>
<i>&gt; </i><br>
<i>&gt; &gt; Chris writes:</i><br>
<i>&gt; &gt; &gt; Is it possible to give commands to a parallel  device via a socket</i><br>
<i>&gt; &gt; &gt; connection?</i><br>
<i>&gt; &gt; </i><br>
<i>&gt; &gt; At first glance, this sounds like it would fall under the same type of</i><br>
<i>&gt; &gt; system as having saned on the Win box, and using saned on your Linux box</i><br>
<i>&gt; &gt; handle the network protocol.  However, it would need the saned on the Win</i><br>
<i>&gt; &gt; box to talk to the Windows scanner driver via TWAIN, and TWAIN allows the</i><br>
<i>&gt; &gt; scanner driver to have the GUI built into the driver.</i><br>
[etc.]<br>
<p>
<i>&gt; I think that what he wants is to be able to connect his scanner to his</i><br>
<i>&gt; Linux box, run saned on that, and have a parallel port driver running on a</i><br>
<i>&gt; windows box that feeds parallel commands sent by whatever TWAIN driver</i><br>
<i>&gt; came with the scanner, over to the saned which works in a pass-through</i><br>
<i>&gt; mode, sending everything straight to the scanner.</i><br>
<p>
 It's a nice enough idea, and there are ways to do it for serial ports<br>
(see the LINUX MODEM SHARING MINI-HOWTO) but typically for scanning you<br>
need to know the status of the control lines, not just the data lines, and<br>
this is noticeably more difficult. Also, the data rate's high enough that<br>
network latencies, delays, etc. might be enough to kill you even if the<br>
implementation was otherwise perfect...<br>
<p>
 Sincerely,<br>
<p>
 Ray Ingles       (248) 377-7735      <a href="mailto:ray.ingles@fanucrobotics.com">ray.ingles@fanucrobotics.com</a><br>
<p>
 If all the muscles in your body pulled in the same direction, you<br>
 could lift over twenty tons. But you'd walk funny. - L. M. Boyd<br>
<p>
<p>
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<ul>
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<li> <b>Next message:</b> <a href="0072.html">Dr. Andreas Bolsch: "Mustek ScanExpress Backend"</a>
<li> <b>Previous message:</b> <a href="0070.html">Sreenivasa Sista: "Re: SCSI-II scanner command list - specification file - common lib"</a>
<li> <b>In reply to:</b> <a href="0059.html">Ian Grant: "Re: raw parallel device Q"</a>
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