sane-project-website/old-archive/1999-10/0169.html

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<!-- name="Karl-Heinz Guenster" -->
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<title>sane-devel: Re: problem getting a snapscan to work</title>
<h1>Re: problem getting a snapscan to work</h1>
<b>Karl-Heinz Guenster</b> (<a href="mailto:Karl-Heinz.Guenster@t-online.de"><i>Karl-Heinz.Guenster@t-online.de</i></a>)<br>
<i>Fri, 22 Oct 1999 07:57:07 +0200 (MEST)</i>
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On 19-Oct-99 joakim verona wrote:<br>
<i>&gt; Karl-Heinz Guenster wrote:</i><br>
<i>&gt;&gt; </i><br>
<i>&gt;&gt; On 18-Oct-99 joakim verona wrote:</i><br>
<i>&gt;&gt; </i><br>
<i>&gt;&gt; Hi Joakim,</i><br>
<i>&gt;&gt; </i><br>
<i>&gt;&gt; [...]</i><br>
<i>&gt;&gt; </i><br>
<i>&gt;&gt; &gt; it now strikes me that the problem might be that the scanner needs</i><br>
<i>&gt;&gt; &gt; termination,</i><br>
<i>&gt;&gt; &gt; but it's unclear how to do this, because the scanner has one db25</i><br>
<i>&gt;&gt; &gt; port</i><br>
<i>&gt;&gt; &gt; and one centronics</i><br>
<i>&gt;&gt; &gt; port. any snapscan users who now if it needs termination?</i><br>
<i>&gt;&gt; </i><br>
<i>&gt;&gt; It's different. My Snapscan needs an active termination on Adaptec</i><br>
<i>&gt;&gt; 2940, but on my Adaptec 1560 no active and no passive termination</i><br>
<i>&gt;&gt; can</i><br>
<i>&gt;&gt; help, only another scanner with termination inside will get them</i><br>
<i>&gt;&gt; running.</i><br>
<i>&gt;&gt; </i><br>
<i>&gt;&gt; I think, you should test active terminators.</i><br>
<i>&gt; </i><br>
<i>&gt; aargh! what are active terminators? do you mean supplying term power</i><br>
<i>&gt; in </i><br>
<i>&gt; the terminator somehow? aargh.</i><br>
<i>&gt; </i><br>
<i>&gt; doesn't active termination refer to the scsi hosts ability to find</i><br>
<i>&gt; out</i><br>
<i>&gt; if it</i><br>
<i>&gt; should terminate the bus or not, depending on if there is an external</i><br>
<i>&gt; chain as well?</i><br>
<p>
Hi Joakim,<br>
<p>
whenever it is possible you should terminate a SCSI-Bus. Therefore<br>
active terminators are the best one. The SCSI-adapter itself can<br>
terminate the exterial bus, if it is prepared for "Auto" or if you<br>
define it manually. But this means that you have no device at the<br>
exterial bus. If there are any devices, the last one in this chain must<br>
have a terminator. <br>
<p>
Several devices have their own terminator inside, but for the rare one<br>
you need passive terminators. But usually active terminators are better<br>
and more expensive, too.<br>
<p>
Greetings Karl-Heinz<br>
<p>
<pre>
-- 
E-Mail: Karl-Heinz Guenster &lt;<a href="mailto:karl-heinz.guenster@t-online.de">karl-heinz.guenster@t-online.de</a>&gt;
Date: 21-Oct-99
Time: 16:28:22
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