[sane-devel] umax 1220P - cabling issue?

[sane at bob-n.com]

Comments below.

On Sat, 15 Dec 2001, stef wrote:

> On Fri, Dec 14, 2001 at 02:00:19PM -0600, sane@bob-n.com wrote:
> > 
> > I have a umax astra 1220P parallel port scanner.  Kernell info:
> > 
> > Linux trc2.bob-n.com 2.4.16 #3 Thu Dec 13 21:14:10 CST 2001 i686 unknown
> > 
> > Running on rehat 7.2, kernel upgraded from www.kernel.org
> > 
> > I've got sane 1.06, with the umax_pp patch umax1220p-2.5.
> > 
> > 
> > When I probe the scanner I get:
> > 
> > # /usr/local/src/sane-backends-1.0.6/tools/umax_pp -p -t 1
> > [sanei_debug] Setting debug level of umax_pp_low to 1.
> > [umax_pp_low] Using /proc info
> > [umax_pp_low] Using /dev/parport0 ...
> > UMAX 1220P scanning program version 2.5 starting ...
> > Probing scanner ....
> > [umax_pp_low] Found 0x18 expected 0x00  (umax_pp_low.c:4331)
> > [umax_pp_low] UMAX Astra 1220/1600/2000 P ASIC detected (mode=7)
> > [umax_pp_low] Unexpected value for for register 0x0D, expected 0x00 or
> > 0x40, got 0x18 ! (umax_pp_low.c:4402)
> > [umax_pp_low] EPPRegisterRead, found 0xFF expected 0x00
> > (umax_pp_low.c:4493)
> > [umax_pp_low] *** It appears that EPP data transfer doesn't work    ***
> > [umax_pp_low] *** Please read SETTING EPP section in sane-umax_pp.5 ***
> > 
> > I've already set the parallel port to EPP 1.7 in the BIOS.
> > 
> > Anyone have any ideas on this?
> 
> 	Failure to use EPP mode is the most common issue with the umax_pp backend.
> It yet unclear to me if the problem comes from the ppdev device, the backend itself,
> or both.
> 
> 	I'm afraid that the problem comes from the warning regarding 'register 0x0D',
> which means that the backend couldn't set properly the epat C7 chip. I think i'll
> have to have a look at some kernel drivers that use this chip to understand what
> really happens.
> 
> 	In one case, changing motherboard cured the problem. 

Did this already. results as above

> In another, giving
> explicitly the parport parameters in modules.conf (instead of 'auto' values) also
> cured it.

Did this also, already, results as above.

> 
> 	One thing that may be worth trying, is to build the backend with no ppdev
> support (by undefining HAVE_LINUX_PPDEV_H in include/sane/config.h). The backend will
> fall back to direct I/O and so will have to be run with root's priviledges.
> 

OK, I'll give this a shot.

> 
> Regards,
> 	Stef
> 
> 	
> > 
> > One SPECIFIC question:  wil this work with any db25 to db25 cable that
> > carries all the pins or do I need some special cable (ieee 1284?)?
> > 
> > - Bob Niederman
> > 
> > 
> > 
> > 
> > 
> > 
> > 
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