[sane-devel] Polling HP Scanjet 7400c buttons?

Parag N(पराग़) panemade at gmail.com
Wed Aug 9 03:15:05 UTC 2006

     On 8/9/06, m. allan noah <anoah at pfeiffer.edu> wrote:
> On Tue, 8 Aug 2006, Nick Papadonis wrote:
> > On Tue, 8 Aug 2006, Nick Papadonis wrote:
> >>> Is there an API to access button status?  Specifically, Email, Fax,
> >>> Copy, OCR buttons?  Additionally, is there an interface to modify the
> >>> LCD string?
> > On Tue, 2006-08-08 at 13:55 -0400, m. allan noah wrote:
> >> not an 'API' exactly, but more of a 'convention'. there are a couple of
> >> button daemons floating around (one is in the experimental cvs tree) which
> >> attempt to read the value of certain named options provided by the
> >> backend.
> >>
> >
> > The interface/convention you mention is good, but too high a level.  I
> > search the the HP backends and didn't see much in regards to button
> > polling.  I did see mention of polling the "front" button, but not sure
> > what it is.
> the 6300 only has a single button.
> >
> > I'm wondering if the buttons can be accessed via the SCL (HP Scanner
> > Control Language) interface.  Does anyone know?  Specs anyone?
> what makes you think the hp 7400 speaks SCL? its built by avision...
> >
> >> write to the LCD? can the windows software do that?
> >
> > Not sure, only Linux here.  I figured it must because all my HP 7400c
> > ever displays is "Initializing" or "Ready" on the LCD.  Even during scans.
> you know what happens when you assume :) if the backend does not change it
> from Initializing to Ready, then i expect its under the complete control
> of the scanner, but i could be wrong.

      FYI when i google i found scanbuttond project that supports few
scanners to have their buttons working fine.
      Current supported scanner list by this project can be found at
      I don't know currently what type of functionality is added in
CVS tree and for which scanners?

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