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95 wiersze
4.5 KiB
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<!-- received="Wed Nov 11 14:20:40 1998 PST" -->
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<!-- sent="Wed, 11 Nov 1998 23:18:49 +0100" -->
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<!-- name="Bernd Schroeder" -->
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<!-- email="bernd@aquila.muc.de" -->
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<!-- subject="Re: Blackwidow 4800SP is really..." -->
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<!-- inreplyto="m0zdOxx-000q11C@yoo-hoo.ai.mit.edu" -->
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<title>sane-devel: Re: Blackwidow 4800SP is really...</title>
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<h1>Re: Blackwidow 4800SP is really...</h1>
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<b>Bernd Schroeder</b> (<a href="mailto:bernd@aquila.muc.de"><i>bernd@aquila.muc.de</i></a>)<br>
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<i>Wed, 11 Nov 1998 23:18:49 +0100</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#109">[ date ]</a><a href="index.html#109">[ thread ]</a><a href="subject.html#109">[ subject ]</a><a href="author.html#109">[ author ]</a>
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<li> <b>Next message:</b> <a href="0110.html">David Fox: "Polaroid SprintScan? Or Nikon Coolscan LS-2000?"</a>
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<li> <b>Previous message:</b> <a href="0108.html">Yuri Dario: "Re: Scn2_90.zip & 9a.zip"</a>
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<li> <b>In reply to:</b> <a href="0099.html">Matto Marjanovic: "Re: Blackwidow 4800SP is really..."</a>
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</ul>
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Hi,<br>
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<p>
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On Tue, Nov 10, 1998 at 08:21:01PM -0500, Matto Marjanovic wrote:<br>
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<i>> </i><br>
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<i>> ...</i><br>
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<i>> >The problem here is that the vendor string is not unique, because</i><br>
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<i>> >Microtek uses the same eight spaces as vendor id for their scanners.</i><br>
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<i>> ...</i><br>
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<i>> >I also looked into the documentation for the devices that are supported</i><br>
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<i>> >by the microtek(1) backend, and according to the specs, they return</i><br>
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<i>> >some vendor specific ASCII string, starting at that position, so that this</i><br>
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<i>> >check should be save.</i><br>
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<i>> ></i><br>
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<i>> >Nevertheless, I don't know whether it is actually the case, that an</i><br>
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<i>> >ASCII string is always there (Matto ?).</i><br>
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<i>> </i><br>
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<i>> Nope, not always the case. Among others, the Microtek E6 has a blank</i><br>
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<i>> (8 spaces) vendor string. All-in-all, the microtek(1) backend looks</i><br>
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<i>> for a choice of five possible strings (one is "AGFA", the other four</i><br>
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<i>> are a variety of brain-dead Microtek options).</i><br>
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<p>
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Hhm, this seems to be a misunderstanding, I referred to the ASCII string<br>
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starting at position 36.<br>
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<p>
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<i>> It's a good idea to try to pick a bunch of characteristics that are</i><br>
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<i>> particular to your scanner command set and unlikely to be duplicated</i><br>
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<i>> in another scanner brand. The microtek(1) backend looks for:</i><br>
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<p>
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But what are these characteristics ? Until recently I thought, that the<br>
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vendor string would uniquely identify a manufacturer, but the<br>
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Artec/Blackwidow model shows that this is wrong. <br>
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<p>
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<i>> o a valid vendor string (out of 5 options, including blank)</i><br>
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<i>> o a SCSI response format of 0x01 (which instantly knocks out</i><br>
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<i>> microtek(2) scanners).</i><br>
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<i>> o a valid model code, found in the microtek-specific byte #62.</i><br>
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<p>
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Reading the last line I think, that the best way to distinguish a<br>
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Blackwidow from a Microtek device is to check for the model codes<br>
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at byte 62 of the inquiry result ( microtek(1) ) and byte 36 ( microtek(2) ).<br>
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<p>
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For the Blackwidow all bytes beyond result[35] are equal to zero. As long <br>
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as no other manufacturer uses a blank vendor string, these checks should<br>
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be save.<br>
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<p>
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Of course, additional checks wouldn't hurt.<br>
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<p>
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(Chris, consider this as a response to your other mail, too).<br>
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<p>
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Bernd<br>
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<p>
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<pre>
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--
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Bernd Schroeder
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Email: <a href="mailto:bernd@aquila.muc.de">mailto:bernd@aquila.muc.de</a>
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PGP public key available: <a href="mailto:pgp@aquila.muc.de">mailto:pgp@aquila.muc.de</a> | Subject: send key
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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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<!-- body="end" -->
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<p>
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<ul>
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<!-- next="start" -->
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|
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<li> <b>Next message:</b> <a href="0110.html">David Fox: "Polaroid SprintScan? Or Nikon Coolscan LS-2000?"</a>
|
|||
|
|
<li> <b>Previous message:</b> <a href="0108.html">Yuri Dario: "Re: Scn2_90.zip & 9a.zip"</a>
|
|||
|
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<li> <b>In reply to:</b> <a href="0099.html">Matto Marjanovic: "Re: Blackwidow 4800SP is really..."</a>
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<!-- nextthread="start" -->
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<!-- reply="end" -->
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</ul>
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