🚀 go-pugleaf

Active termination is required if you're using any UltraSCSI or UltraWide
devices on the SCSI chain.  Otherwise the passive terminator is fine.

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

You can read about termination and other SCSI issues at
http://www.paralan.com/glos.html

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.

-- 
Frank

Shannon Jacobs <shanen@my-dejanews.com> wrote in message news:7gfcn0$202$1@tipgw2.t-kougei.ac.jp...
> I have a SCSI PC card with a relatively short cable.  The scanner came with
> a PCI SCSI card that I'm not using and a 25-pin passive terminator, and the
> SCSI PC card came with a 50-pin active terminator.  Right now, the active
> terminator is unused and has no involvement with the scanner, but I'm
> mentioning it in case that's somehow an important piece of data--only the
> passive terminator will fit on the scanner.
> 
> There are various ways to hook up the cables, but I've only discovered three
> configurations that actually work.  I'm pretty sure I've tried all the other
> possibilities, but if you think I might have missed an important one, let me
> know and I'll try that, too, or confirm that I already checked it and it
> didn't work.
> 
> 1)  If the SCSI card is connected directly to the scanner with no terminator
> it works.
> 
> 2)  If the SCSI card is connected to another device and then daisy chained
> to the scanner with no terminator on the scanner, and the other device is
> turned off, then the scanner works.  Actually, this seems to work best and
> is the configuration I am using now.
> 
> 3)  Finally, if the scanner is connected via the daisy chain, but with its
> terminator, then it will work, but ONLY if the other device is turned on.
> 
> However, in general I have to say that so far the SCSI is not very
> impressive.  When using the USB scanner the computer remains basically
> functional, and I can continue doing other work.  When using the SCSI
> scanner, there are long periods when the machine is basically locked up and
> unable to do anything but scan.  As already mentioned, these periods seem to
> be shortest with configuration 2, and the scans also seem to be faster.  I
> don't know if it's an important clue, but the times when the computer is
> locked up are the same times as when the scanner is making a particular
> sound.  During the SCSI scans the CPU remains at 100% continuously, though
> the machine goes back and forth between the active and locked up state.