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Re: Addressing a SCSI film-scanner - SUCCESS!



On Wednesday 08 March 2006 05:50, Anne Wilson wrote:
> Paul & Mogens, thanks to your encouragement I have successfully scanned!
>
> There are two scsi connectors on the back of the scanner, and the
> documentation does not make it clear which one I should use.  My memory was
> that it only worked on one of them, but I couldn't remember which one.  I
> changed the connection to the other one, and re-ran the rescan-scsi-bus.sh
> script.  It found and correctly labelled the scanner on SCSI1, Channel 0,
> ID 5, LUN 0 (obviously the tiny 5 on the setting had looked like a 3 to
> me).  At that point I ran vuescan and it simply worked.  I did not need to
> apply the patch at all.

I kinda hate to jump in here where I haven't been in the loop before, but 
unless scsi has changed in the last few years, as I remember, most scsi 
devices have two connectors.  Either can be input and the other then is 
output.  The scsi bus is serial - up to seven devices in a row.  The last 
device has a terminator plug on it which electrically terminates the data 
lines with resistors.  If there is only one device attached, it should have a 
terminator.  The other end of the bus is terminated on the scsi card.

Many devices will work (although often imperfectly) without proper 
termination.

If this has been covered before please excuse me.
bruce

>
> According to the documentation the problem is almost certainly caused by a
> delay in reporting after a scsi re-set.  It seems that there are now four
> options for correcting this, two of which require a kernel recompile, so
> I'll ignore them.
>
> # Use the rescan-scsi-bus.sh script or manually use the scsi
> add-single-device command to detect your device, whenever needed. You max
> want to put something like (sleep 10; echo "scsi add-single-device C B T U"
> >/proc/scsi/scsi)&  to your system startup scripts.
>
> I think this is probably the simplest, and that the command would be "scsi
> add-single-device 1 0 5 0" - do you agree?
>
> # Prevent the tmscsim driver from resetting the SCSI bus on startup. Look
> at README.tmscsim (it is included in the driver distribution and can be
> found inside the kernel source tree in linux/drivers/scsi/README.tmscsim.)
> [tmscsim=7,0,31,43]
>
> Do you see any advantage in following the second way?
>
> Anne


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