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<H1>Re: Interesting news, and some questions</H1>
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<STRONG>From:</STRONG> Karl Heinz Kremer (<A HREF="mailto:khk@khk.net?Subject=Re:%20Interesting%20news,%20and%20some%20questions&In-Reply-To=&lt;20000320221934.C1192@khk.net&gt;"><EM>khk@khk.net</EM></A>)<BR>
<STRONG>Date:</STRONG> Mon Mar 20 2000 - 19:19:34 PST
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On Mon, Mar 20, 2000 at 10:58:04PM +0000, Torsten Howard wrote:
<BR>
<P>Before you invest any more time, there is a chance that the problems
<BR>
you are seeing are caused by the USB system. The several minutes time
<BR>
outs are also seen with e.g. a Kodak camera. That's also the reason
<BR>
why I'm not doing anything in the backend code at this time. I just
<BR>
got confirmation that the latest backend code is still working with
<BR>
a Perfection 610.
<BR>
<P><EM>&gt; Anyways, here are a few questions for the knowledgeable:
</EM><BR>
<EM>&gt;
</EM><BR>
<EM>&gt; Does scanimage determine the scanner identity from these 'S:' entries, as seen in the usb/devices file?
</EM><BR>
<P>No. The EPSON backend get's the scanner manufacturer and name from
<BR>
a command that's send to the scanner.
<BR>
<P><EM>&gt; What could the access to the scanner driver change, such that the usb susbsystem can no longer identify the scanner?
</EM><BR>
<P>USB errors?
<BR>
<P><EM>&gt; How, exactly, are scanner identities determined? Inside each individual driver code? By standard mechanism? Are there differences between the USB/SCSI command requests (esp. for the epson)?
</EM><BR>
<P>Yes, each backend does this. In the case of the EPSON backend the SCSI and USB
<BR>
scanners are treated the same way. The command set is the same.
<BR>
<P><EM>&gt; Oh well, it's ten pm and I must study for dynamics test. More on this later.
</EM><BR>
<P>Good luck,
<BR>
<P>Karl Heinz
<BR>
<P><PRE>
--
Karl Heinz Kremer <A HREF="mailto:khk@khk.net?Subject=Re:%20Interesting%20news,%20and%20some%20questions&In-Reply-To=&lt;20000320221934.C1192@khk.net&gt;">khk@khk.net</A>
<A HREF="http://www.khk.net">http://www.khk.net</A>
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