Provided by: libsane-common_1.0.22-7ubuntu1_i386 bug


       sane-st400 - SANE backend for Siemens ST/Highscan flatbed scanners


       The  sane-st400  library  implements  a  SANE (Scanner Access Now Easy)
       backend that provides access to  Siemens  ST400  flatbed  scanners  and
       compatibles.   At present, the following scanners are supported by this

              Siemens ST400 (6 bit gray scale)
              Siemens ST800 (6 bit gray scale)

       The driver supports line art and gray scans up to 8bpp.

       The Siemens ST/Highscan series includes several more models,  e.g.  the
       ST300  and ST600.  If you own one of these scanners, or a scanner other
       than the ones listed above that works with this backend, please let  us
       know  by  sending  the  scanner's  model  name,  SCSI  ID, and firmware
       revision  to   Have  a   look   at  concerning subscription
       to sane-devel.


       This backend expects device names of the form:


       Where special is either the  path-name  for  the  special  device  that
       corresponds  to  a  SCSI scanner. For SCSI scanners, the special device
       name must be a generic SCSI device or  a  symlink  to  such  a  device.
       Under  Linux,  such  a  device  name could be /dev/sga or /dev/sge, for
       example.  See sane-scsi(5) for details.


       The contents of the st400.conf file is a  list  of  device  names  that
       correspond  to Siemens scanners.  Empty lines and lines starting with a
       hash mark (#) are ignored.  A sample configuration file is shown below:

              # this is a comment

       The default configuration file that is distributed with SANE looks like

              scsi SIEMENS "ST 400" Scanner * * 3 0

       In  this  configuration,  the driver can only access the ST400 model at
       SCSI ID 3 LUN 0 (see section "BUGS" below for the reason).  To use  the
       driver  with  other  scanner  models,  add  an  appropriate line to the
       configuration file.  For example, to use it with an ST800 at SCSI ID  3
       LUN 0, add the line:

              scsi SIEMENS "ST 800" Scanner * * 3 0


              The   backend   configuration  file  (see  also  description  of
              SANE_CONFIG_DIR below).

              The static library implementing this backend.

              The shared library implementing this backend (present on systems
              that support dynamic loading).


              This environment variable specifies the list of directories that
              may contain the configuration file.  Under UNIX, 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).

              If the library was compiled with  debug  support  enabled,  this
              environment  variable controls the debug level for this backend.
              E.g., a value of 128 requests all debug output  to  be  printed.
              Smaller levels reduce verbosity.


       Everything but the most basic stuff.


       Currently,  the backend does not check if the attached device really is
       a  ST400.   It  will  happily  accept  everything  that   matches   the
       configuration  entries.   This  makes  it easy to test the backend with
       other scanners: Just add an appropriate line to the configuration file.
       The  configuration  file as distributed (see above) only works with the
       ST400.  Be careful: If there is no config  file  at  all,  the  backend
       defaults to /dev/scanner.

       The  ST400  answers  on  all  eight  SCSI LUNs.  Normally this is not a
       problem, as LUN support is usually disabled in SCSI drivers, but if you
       are  seeing  multiple instances of the scanner in a device list, either
       disable  LUNs  in  your  SCSI  setup  or  change  the  entry   in   the
       configuration file to match LUN 0 only.


       If   you   encounter   a   bug  please  set  the  environment  variable
       SANE_DEBUG_ST400 to 128 and try to regenerate the problem. Then send me
       a report with the log attached.

       If  you  encounter  a SCSI bus error or trimmed and/or displaced images
       please also set the environment variable SANE_DEBUG_SANEI_SCSI  to  128
       before sending me the report.


       sane(7), sane-scsi(5)


       Ingo Wilken <>

                                  14 Jul 2008                    sane-st400(5)