NAME

       sane-u12 - SANE backend for Plustek USB flatbed scanners, based on older parport designs

DESCRIPTION

       The  sane-u12  library  implements  a SANE (Scanner Access Now Easy) backend that provides
       access to USB flatbed scanners based on Plusteks' ASIC 98003 (parallel-port  ASIC)  and  a
       GeneSys Logics' USB-parport bridge chip.

SUPPORTED DEVICES

       The  backend  is  able  to  support  some  early Plustek USB scanners that based their old
       parport design around the ASIC 98003 and other rebadged  Plustek  devices.  The  following
       tables will give you a short overview.

       If  your  Plustek scanner has another Product ID, then the device is NOT supported by this
       backend.

       Vendor Plustek - ID: 0x07B3
       ----------------------------------------------------------
       Model:                   Vendor-ID:       Product-ID:
       ----------------------------------------------------------
       OpticPro U12             0x07B3           0x0001
       OpticPro U1212           0x07B3           0x0001
       OpticPro UT12            0x07B3           0x0001

       Vendor KYE/Genius
       --------------------------------------------------------
       USB Model:               Vendor-ID:       Product-ID:
       --------------------------------------------------------
       ColorPage Vivid III USB  0x07B3           0x0001
       ColorPage HR6 V1         0x0458           0x2004

CONFIGURATION

       To use your scanner with this backend, you need at least two entries in the  configuration
       file /etc/sane.d/u12.conf

              [usb] vendor-id product-id
              device /dev/usbscanner

       [usb]  tells  the  backend, that the following devicename (here /dev/usbscanner) has to be
       interpreted as USB scanner device. If vendor- and product-id has not been  specified,  the
       backend  tries  to detect this by its own. If device is set to auto then the next matching
       device is used.

       The Options:

       option warmup t
              t specifies the warmup period in seconds

       option lampOff t
              t is the time in seconds for switching off the lamps in standby mode

       option lOffonEnd b
              b specifies the behaviour when closing the backend, 1 --> switch lamps off,  0  -->
              do not change lamp status

       See the u12.conf file for examples.

       Note:  You  have  to  make  sure,  that the USB subsystem is loaded correctly and you have
       access to the device-node. For  more  details  see  sane-usb(5)  manpage.  You  might  use
       sane-find-scanner(1) to check that you have access to your device.

       Note:
       If there's no configuration file, the backend defaults to device auto

FILES

       /etc/sane.d/u12.conf
              The backend configuration file

       /usr/lib/x86_64-linux-gnu/sane/libsane-u12.a
              The static library implementing this backend.

       /usr/lib/x86_64-linux-gnu/sane/libsane-u12.so
              The  shared  library  implementing  this  backend  (present on systems that support
              dynamic loading).

ENVIRONMENT

       SANE_CONFIG_DIR
              This environment variable specifies the list of directories that  may  contain  the
              configuration  file.   On  *NIX  systems,  the directories are separated by a colon
              (`:'), under OS/2, they are separated by a semi-colon (`;').  If this  variable  is
              not  set, the configuration file is searched in two default directories: first, the
              current working directory (".") and then in  /etc/sane.d.   If  the  value  of  the
              environment  variable ends with the directory separator character, then the default
              directories are searched after the explicitly specified directories.  For  example,
              setting  SANE_CONFIG_DIR  to "/tmp/config:" would result in directories tmp/config,
              ., and /etc/sane.d being searched (in this order).

       SANE_DEBUG_U12
              If the library was compiled with debug support enabled, this  environment  variable
              controls  the  debug  level  for  this  backend.   Higher debug levels increase the
              verbosity of the output.

              Example: export SANE_DEBUG_U12=10

SEE ALSO

       sane(7), sane-usb(5), sane-plustek(5), sane-find-scanner(1), xscanimage(1), scanimage(1)
       /usr/share/doc/libsane/u12/U12.changes

CONTACT AND BUG-REPORTS

       Please send any information and bug-reports to:
       SANE Mailing List

       Additional info and hints can be obtained from our
       Mailing-List archive at:
       http://www.sane-project.org/mailing-lists.html

       To  obtain  debug  messages  from  the  backend,  please  set   the   environment-variable
       SANE_DEBUG_U12 before calling your favorite scan-frontend (i.e.  xscanimage(1)), i.e.:

       export SANE_DEBUG_U12=20 ; xscanimage

       The value controls the verbosity of the backend.

KNOWN BUGS & RESTRICTIONS

       * The driver is in alpha state, so please don't expect too much!!!

       *  When  using  libusb,  it might be, that the backend hangs.  In that case, reconnect the
       scanner.

                                           14 Jul 2008                                sane-u12(5)