sane-st400(5)							File Formats Manual						     sane-st400(5)

NAME

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

DESCRIPTION

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

DEVICE NAMES

       This backend expects device names of the form:

	      special

       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.

CONFIGURATION

       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:

	      /dev/scanner
	      # this is a comment
	      /dev/sge

       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

FILES

       /etc/sane.d/st400.conf
	      The backend configuration file (see also description of SANE_CONFIG_DIR below).

       /usr/lib/sane/libsane-st400.a
	      The static library implementing this backend.

       /usr/lib/sane/libsane-st400.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.  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	configura-
	      tion  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 explic-
	      itly  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_ST400
	      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.

MISSING FUNCTIONALITY

       Everything but the most basic stuff.

BUGS

       Currently, the backend does not check if the attached device really is a ST400.	It will happily accept everything that matches the config-
       uration 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 configura-
       tion file to match LUN 0 only.

DEBUG

       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.

SEE ALSO

       sane(7), sane-scsi(5)
       http://www.informatik.uni-oldenburg.de/~ingo/sane/

AUTHOR

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

								    08 Mar 1999 						     sane-st400(5)