Re: sane-backend for Epson EcoTank ET-2711
On Wed 04 May 2022 at 15:43:03 +0200, Dieter Rohlfing wrote:
> Am Wed, 4 May 2022 12:50:14 +0100
> schrieb Brian <ad44@cityscape.co.uk>:
>
> >I wonder whether the net backend is required. What happens if the
> >entry is commented out?
>
> My fault: net was enabled, therefore I thought, that it is necessary.
> According to your proposal I disabled net and access to ET2711 is
> possible. So no need to enable net, airscan alone is sufficient.
If you do not need more that 100dpi and 300dpi, airscan gives a
user an alternative to Epson's non-free driver.
> >Scanning is taking place using the WSD (Web Services for Devices)
> >protocol. The eSCL protocol needs AirPrint on the device.
>
> I thought eSCL is just a synonym for WSD. Wrong or right? This is my
> first approach to scanning and I'm not very familiar with the different
> scanning protocols.
They are two completely different independent protocols. See
https://wiki.debian.org/SaneOverNetwork
> >Would you confirm you can scan with
> >
> > xsnae "airscan:w0:EPSON ET-2710 Series"
>
> It works.
Thanks.
> >Unfortunately, the vendor's implementation of WSD may offer only
> >a limited number of resolutions. airscan cannot do anything about
> >this; it can only work with what it is told by the device.
>
> Agreed.
eSCL would have provided a wider range of resolutions. Why in this
day and age Epson chose not to provide the device with AirPrint is
beyond me.
> >With a USB connection, what do you get for
> > lsusb -v | grep -A 3 bInterfaceClass.*7 ?
>
> The output is:
>
> > bInterfaceClass 7 Printer
> > bInterfaceSubClass 1 Printer
> > bInterfaceProtocol 2 Bidirectional
> > iInterface 6 USB2.0 Printer
The device does not provide IPP-over-USB either. Many MFPs have been
offering it since soon after 2012.
--
Brian.
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