NAME    [Toc]    [Back]

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

DESCRIPTION    [Toc]    [Back]

       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
       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     [email protected].	    Have     a	   look     at
       http://www.mostang.com/sane/mail.html  concerning subscription to sanedevel.

DEVICE NAMES    [Toc]    [Back]

       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    [Toc]    [Back]

       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    [Toc]    [Back]

       /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    [Toc]    [Back]

       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 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_ST400    [Toc]    [Back]
	      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    [Toc]    [Back]

       Everything but the most basic stuff.

BUGS    [Toc]    [Back]

       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.

DEBUG    [Toc]    [Back]

       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    [Toc]    [Back]

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

AUTHOR    [Toc]    [Back]

       Ingo Wilken <[email protected]>



				  08 Mar 1999			 sane-st400(5)