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Article #166

Re: SCSI scanner--Active vs. Passive termination

#166
From: Shannon Jacobs
Date: Tue, 04 May 1999 00:00
37 lines
3027 bytes
Well, it's been an interesting thread already, but I'm feeling a lot of heat
without seeing much light so far....  But I'll try to read through some of
the new FAQs which have been referenced.


<snip>
>Both physical ends, and only the ends, of the cable must be terminated,
>and any devices between the two ends must have termination disabled.

That's what I thought, but...  Right now it continues to work best with NO
terminator on the scanner.  I vaguely think this proves the scanner must
have internal termination of some kind, though I see no way to disable it.
So why did they provide the passive terminator in the first place?  Beats
me.

I'm also concerned about the fact that the passive terminator is the 25-pin
type.  However, all the cables are 50-wire and the scanner is at the end,
connected to a normal cable.  Someone in another post suggested it was a Mac
scanner, but even though some of the new Macs have PCI bus slots, I'm pretty
sure there is no Mac software here, and that this is intended for use with
Windows 9x.


<snip>
>As far as the scanner locking up your system, that's caused by using a
>non-busmastering SCSI card.  You say you're not using the card that
>came with the scanner, so what card are you using?  An Adaptec 2906
>or 2902E (or similar busmastering card) should fix the problem.

The SCSI card I'm actually using is a PC card type.  It's a Japanese brand,
so this probably isn't going to do much good, but on the card it says:
Logitec LPM-SCSI2E SCSI-2 Card UltraSMIT.  This is the card that came with
the active terminator (which I'm not using).  But I think that this implies
it is supposed to be a faster and newer SCSI interface than the one that
came with the scanner, though I don't know how to find out about the bus
mastering.  I'll try digging in the manual, but this is going to be pushing
my Japanese to new limits...
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From: "Shannon Jacobs" <shanen@my-dejanews.com>
Subject: Re: SCSI scanner--Active vs. Passive termination
Date: 1999/05/04
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