[sane-devel] Ability to control scanner imaging head return speed?

[Joel Penner]

Thanks a lot for the information Ralph! That's very helpful and it's good
to know that different backends have varying degrees of control over the
scanner at hand. :)

- Joel

On Sat, Dec 2, 2023 at 11:58 AM Ralph Little <skelband at gmail.com> wrote:

> Hi,
>
> On 2023-12-01 11:56, Joel Penner wrote:
> > Hello,
> >
> > I was wondering whether it's possible with SANE to control how quickly
> > the scanner imaging head is returned to the starting position. Maybe
> > it's a long shot as this is probably controlled through firmware, but
> > just checking. Ideally I would like the ability to control the
> > retraction speed of the Canon CanoScan 9000f or 8800f scanners or the
> > Epson V550 scanner. I am trying to slow this down to make the scanner
> > operation quieter.
> >
> >
> I'm pretty sure that the Canons cannot be easily modified in this way,
> at least I'm not aware of anything in the pixma protocols that allow the
> return speed of the print head. The bjnp and mfnp protocols are pretty
> high level and the smarts for controlling the scan head are in the
> firmware of the device.
>
> As for the V550, it *might* be possible. I don't know much about this
> device nor its protocols.
>
> TBH, to get direct control, you would need something with a more
> hardware-oriented interface, perhaps a Genesys-based device where the
> backend is manipulating the motor slope and speed tables. With one of
> them you would have a chance.
>
> Cheers,
> Ralph
>
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