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sane-st400(5)									    sane-st400(5)

       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 scan-
       ners are supported by this backend:

	      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	sane-devel@mostang.com.      Have     a      look      at
       http://www.mostang.com/sane/mail.html 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 con-
       figuration file is shown below:

	      # this is a comment

       The default configuration file that is distributed with SANE looks like this:

	      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 scan-
       ner 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 <Ingo.Wilken@informatik.uni-oldenburg.de>

					   08 Mar 1999				    sane-st400(5)
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