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

m. allan noah anoah at pfeiffer.edu
Wed Aug 9 00:05:51 UTC 2006

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.

"so don't tell us it can't be done, putting down what you don't know.
money isn't our god, integrity will free our souls" - Max Cavalera

More information about the sane-devel mailing list