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74 wiersze
3.7 KiB
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<!-- received="Sun Jul 19 00:33:39 1998 PDT" -->
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<!-- sent="Thu, 16 Jul 1998 13:40:28 -0400 (EDT)" -->
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<!-- name="Raymond A. Ingles" -->
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<!-- email="inglesra@frc.com" -->
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<!-- subject="Re: raw parallel device Q" -->
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<!-- inreplyto="Pine.OSF.3.96.980716172129.9161P-100000@quark.amtp.cam.ac.uk" -->
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<title>sane-devel: Re: raw parallel device Q</title>
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<h1>Re: raw parallel device Q</h1>
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<b>Raymond A. Ingles</b> (<a href="mailto:inglesra@frc.com"><i>inglesra@frc.com</i></a>)<br>
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<i>Thu, 16 Jul 1998 13:40:28 -0400 (EDT)</i>
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<p>
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<ul>
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<li> <b>Messages sorted by:</b> <a href="date.html#71">[ date ]</a><a href="index.html#71">[ thread ]</a><a href="subject.html#71">[ subject ]</a><a href="author.html#71">[ author ]</a>
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<li> <b>Next message:</b> <a href="0072.html">Dr. Andreas Bolsch: "Mustek ScanExpress Backend"</a>
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<li> <b>Previous message:</b> <a href="0070.html">Sreenivasa Sista: "Re: SCSI-II scanner command list - specification file - common lib"</a>
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<li> <b>In reply to:</b> <a href="0059.html">Ian Grant: "Re: raw parallel device Q"</a>
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</ul>
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On Thu, 16 Jul 1998, Ian Grant wrote:<br>
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<p>
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<i>> On Thu, 16 Jul 1998, Andreas Dilger wrote:</i><br>
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<i>> </i><br>
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<i>> > Chris writes:</i><br>
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<i>> > > Is it possible to give commands to a parallel device via a socket</i><br>
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<i>> > > connection?</i><br>
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<i>> > </i><br>
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<i>> > At first glance, this sounds like it would fall under the same type of</i><br>
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<i>> > system as having saned on the Win box, and using saned on your Linux box</i><br>
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<i>> > handle the network protocol. However, it would need the saned on the Win</i><br>
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<i>> > box to talk to the Windows scanner driver via TWAIN, and TWAIN allows the</i><br>
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<i>> > scanner driver to have the GUI built into the driver.</i><br>
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[etc.]<br>
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<p>
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<i>> I think that what he wants is to be able to connect his scanner to his</i><br>
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<i>> Linux box, run saned on that, and have a parallel port driver running on a</i><br>
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<i>> windows box that feeds parallel commands sent by whatever TWAIN driver</i><br>
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<i>> came with the scanner, over to the saned which works in a pass-through</i><br>
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<i>> mode, sending everything straight to the scanner.</i><br>
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<p>
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It's a nice enough idea, and there are ways to do it for serial ports<br>
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(see the LINUX MODEM SHARING MINI-HOWTO) but typically for scanning you<br>
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need to know the status of the control lines, not just the data lines, and<br>
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this is noticeably more difficult. Also, the data rate's high enough that<br>
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network latencies, delays, etc. might be enough to kill you even if the<br>
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implementation was otherwise perfect...<br>
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<p>
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Sincerely,<br>
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<p>
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Ray Ingles (248) 377-7735 <a href="mailto:ray.ingles@fanucrobotics.com">ray.ingles@fanucrobotics.com</a><br>
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<p>
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If all the muscles in your body pulled in the same direction, you<br>
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could lift over twenty tons. But you'd walk funny. - L. M. Boyd<br>
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<p>
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<p>
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<pre>
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--
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Source code, list archive, and docs: <a href="http://www.mostang.com/sane/">http://www.mostang.com/sane/</a>
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To unsubscribe: echo unsubscribe sane-devel | mail <a href="mailto:majordomo@mostang.com">majordomo@mostang.com</a>
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</pre>
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<p>
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<ul>
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<!-- next="start" -->
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<li> <b>Next message:</b> <a href="0072.html">Dr. Andreas Bolsch: "Mustek ScanExpress Backend"</a>
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<li> <b>Previous message:</b> <a href="0070.html">Sreenivasa Sista: "Re: SCSI-II scanner command list - specification file - common lib"</a>
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<li> <b>In reply to:</b> <a href="0059.html">Ian Grant: "Re: raw parallel device Q"</a>
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<!-- nextthread="start" -->
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<!-- reply="end" -->
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</ul>
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