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       sane-mustek  -  SANE backend for Mustek SCSI flatbed scanners (and some
       other devices)


       The sane-mustek library implements a SANE  (Scanner  Access  Now  Easy)
       backend  that  provides  access to Mustek (and some relabeled Trust and
       Primax) SCSI and parport flatbed scanners.  At present,  the  following
       scanners are known to work more or less with this backend:

              Paragon MFS-6000CX
              Paragon MFS-12000CX
              Paragon MFC-600S, 600 II CD, ScanMagic 600 II SP
              Paragon MFC-800S, 800 II SP
              Paragon MFS-6000SP
              Paragon MFS-8000SP
              Paragon MFS-1200SP, MFS-12000SP
              ScanExpress 6000SP
              ScanExpress   12000SP,   12000SP  Plus,  Paragon  1200  III  SP,
              ScanMagic 9636S, 9636S Plus
              Paragon 1200 LS
              ScanExpress A3 SP
              Paragon 1200 SP Pro
              Paragon 1200 A3 Pro
              Paragon 600 II EP
              Paragon 600 II N
              Trust Imagery 1200
              Trust Imagery 1200 SP
              Trust Imagery 4800 SP
              Trust SCSI Connect 19200
              Primax Compact 4800 SCSI

       More  details  can  be  found  on  the  Mustek  SCSI  backend  homepage

       Don’t  mix  up  MFS  (Paragon),  Pro  and  ScanExpress  models! They’re
       completely different. Check the exact model name!

       Note that most of the above scanners come with a SCSI  interface.   The
       only  non-SCSI scanners that have some support at this point is the 600
       II N and 600 II EP scanners. The former one comes with its own parallel
       port  adapter  (i.e.,  it  does  not  attach to the printer port). Both
       scanners use the SCSI protocol internally, too. More info on how to use
       these  parallel  port  scanners  can be found below in section PARALLEL
       PORT SCANNERS.  Other parallel port scanners are not supported by  this
       backend  but  you  may  be  successful  using  the Mustek parallel port
       backend mustek_pp, see sane-mustek_pp(5).  USB scanners  are  also  not
       supported  by  this  backend  but  the  ma1509, mustek_usb, gt68xx, and
       plustek backends include support for some of them, see  sane-ma1509(5),
       sane-mustek_usb(5), sane-gt68xx(5), and sane-plustek(5).

       Mustek  scanners have no protection against exceeding the physical scan
       area height.  That is, if a  scan  is  attempted  with  a  height  that
       exceeds  the height of the scan surface, the scanner begins making loud
       noises and the scan mechanism may be damaged.  Thus, if you hear such a
       noise,  IMMEDIATELY turn off the scanner. This shouldn’t happen if your
       scanner is in the list of known scanners. There is more information  in
       the /usr/share/doc/libsane/PROBLEMS file.

       If you own a Mustek (or Trust) scanner other than the ones listed above
       that works with this  backend,  please  let  us  know  by  sending  the
       scanner’s  exact model name (look at the front and back of the scanner)
       and a debug output to  You can  get
       the  debug output by setting the environment variable SANE_DEBUG_MUSTEK
       to 5 and showing the list of  available  scanners  with  scanimage  -L.
       Please  send  all  of it to the mailing list. You must be subscribed to
       sane-devel   before   you   can   send   mail   to   the   list.    See for details.


       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 or the port number at which the  parallel
       port  scanners can be found (see section PARALLEL PORT SCANNERS below).
       For SCSI scanners, the special device  name  must  be  a  generic  SCSI
       device  or  a  symlink to such a device.  The program sane-find-scanner
       helps to find out the correct device. Under Linux, such a  device  name
       could  be  /dev/sg0  or  /dev/sg3,  for  example.  See sane-scsi(5) for


       The contents of the mustek.conf file is a list of  options  and  device
       names  that  correspond  to  Mustek  scanners.   Empty  lines and lines
       starting with a hash mark (#) are ignored.  See sane-scsi(5) on details
       of what constitutes a valid device name.

       The  supported  options  are linedistance-fix, lineart-fix, legal-size,
       buffersize,    blocksize,    strip-height,    disable-double-buffering,
       disable-backtracking, and force-wait.

       Options  come  in  two  flavors:  global  and  positional ones.  Global
       options apply to all devices managed by the backend whereas  positional
       options  apply  just  to the most recently mentioned device.  Note that
       this means that the order in which the options appear matters!

       Option linedistance-fix is positional and works around a  problem  that
       occurs  with some SCSI controllers (notably the ncr810 controller under
       Linux).  If color scans have horizontal stripes and/or the  colors  are
       off,  then  it’s likely that your controller suffers from this problem.
       Turning on this option usually fixes the problem.

       Option lineart-fix is positional and works around a timing problem that
       seems   to  exist  with  certain  MFS-12000SP  scanners.   The  problem
       manifests itself in  dropped  lines  when  scanning  in  lineart  mode.
       Turning  on  this  option  should  fix  the  problem  but may slow down
       scanning a bit.

       Option legal-size is positional and sets the size of the scan  area  to
       Legal  format.  Set this option if you own a Paragon 12000 LS. It can’t
       be distinguished by software  from  a  ScanExpress  12000  SP  (ISO  A4

       Option  buffersize  is  a  positional option that overrides the default
       value set for the size of the SCSI buffer. The buffer size is specified
       in kilobytes. The default value is 128. Because of double buffering the
       buffer actually sent to the scanner is half the size of this value. Try
       to  increase  this  value to achieve higher scan speeds. Note that some
       ScanExpress scanners don’t like buffer sizes above 64 kb (buffersize  =
       128).  If your sg driver can’t set SCSI buffer sizes at runtime you may
       have to change that value, too. See sane-scsi(5) for details.

       Option blocksize is a positional  option  that  overrides  the  default
       value  set  for  the  maximum  amount of data scanned in one block. The
       buffer size is specified in kilobytes. Some  scanners  freeze  if  this
       value is bigger than 2048. The default value is 1 GB (so effectively no
       limit) for most scanners. Don’t change this value  if  you  don’t  know
       exactly what you do.

       Option  strip-height  is a global option that limits the maximum height
       of the strip scanned with a single SCSI read command.   The  height  is
       specified  in  inches  and  may  contain a fractional part (e.g., 1.5).
       Setting the strip-height to a  small  value  (one  inch,  for  example)
       reduces  the  likelihood  of  encountering  problems  with  SCSI driver
       timeouts and/or timeouts with other  devices  on  the  same  SCSI  bus.
       Unfortunately, it also increases scan times. With current SCSI adapters
       and drivers this option shouldn’t be needed any more.

       Option disable-double-buffering is a global option. If set, the backend
       will  only send one buffer at a time to the scanner. Try this option if
       you have trouble while scanning, e.g.  SCSI  errors,  freezes,  or  the
       first few cm are repeated over and over again in your image.

       Option disable-backtracking is a positional option. If set, the scanner
       will not move  back  its  slider  after  each  SCSI  buffer  is  filled
       (‘backtracking’). Setting this option will lead to faster scans but may
       also produce horizontal stripes. This option doesn’t  work  with  every
       scanner (only some of the paragon models can modify backtracking).

       Finally,  force-wait  is a global option. If set, the backend will wait
       until the device is ready before sending the inquiry  command.  Further
       more  the  backend will force the scan slider to return to its starting
       position (not  implemented  for  all  scanners).  This  option  may  be
       necessary  with  the  600 II N or when scanimage is used multiple times
       (e.g. in scripts). The default is off (not set).

       A sample configuration file is shown below:

              # limit strip height of all scanners to 1.5 inches:
              option strip-height 1.5
              /dev/scanner    # first Mustek scanner
              # 1 MB buffer for /dev/scanner:
              option buffersize 1024
              /dev/sge        # second Mustek scanner
              # turn on fixes for /dev/sge:
              option lineart-fix
              option linedistance-fix


       You need a SCSI adapter for the SCSI scanners. Even if the connector is
       the  same  as  that  of  parallel  port  scanners, connecting it to the
       computers parallel port will NOT work.

       Mustek SCSI scanners are typically delivered with an ISA SCSI  adapter.
       Unfortunately, that adapter is not worth much since it is not interrupt
       driven.  It is (sometimes) possible to get the supplied card  to  work,
       but  without interrupt line, scanning will be very slow and put so much
       load on the system, that it becomes almost unusable for other tasks.

       If you already have a working  SCSI  controller  in  your  system,  you
       should  consider  that  Mustek  scanners  do  not  support  the  SCSI-2
       disconnect/reconnect protocol and hence tie up the  SCSI  bus  while  a
       scan  is in progress.  This means that no other SCSI device on the same
       bus can be accessed while a scan is in progress.

       Because the Mustek-supplied adapter  is  not  worth  much  and  because
       Mustek   scanners   do  not  support  the  SCSI-2  disconnect/reconnect
       protocol,  it  is  recommended  to  install  a  separate  (cheap)  SCSI
       controller  for  Mustek  scanners.  For example, ncr810 based cards are
       known to work fine and cost as little as fifty US dollars.

       For Mustek scanners, it is typically necessary to  configure  the  low-
       level  SCSI driver to disable synchronous transfers (sync negotiation),
       tagged command queuing, and target disconnects.  See  sane-scsi(5)  for
       driver- and platform-specific information.

       The  ScanExpress  models  have  sometimes  trouble with high resolution
       color  mode.  If  you  encounter  sporadic  corrupted   images   (parts
       duplicated  or shifted horizontally) kill all other applications before
       scanning and (if sufficient memory is available) disable swapping.

       Details on how to get the Mustek SCSI adapters and other cards  running
       can  be found at


       This backend has support for the Paragon 600 II EP and Paragon 600 II N
       parallel  port  scanners.   Note that the latter scanner comes with its
       own ISA card that implements a funky parallel port (in other words, the
       scanner does not connected to the printer parallel port).

       These  scanners  can  be  configured  by listing the port number of the
       adapter or the parallel port  in  the  mustek.conf  file.   Valid  port
       numbers  for the 600 II N are 0x26b, 0x2ab, 0x2eb, 0x22b, 0x32b, 0x36b,
       0x3ab, 0x3eb.  For the 600 II EP use one of these: parport0,  parport1,
       parport2, 0x378, 0x278, 0x3bc.  Pick one that doesn’t conflict with the
       other hardware in your computer. Put only one number on a single  line.


       Note  that  for  these scanners usually root privileges are required to
       access the I/O ports.  Thus, either make frontends such as scanimage(1)
       and  xscanimage(1)  setuid  root  (generally not recommended for safety
       reasons) or, alternatively, access this  backend  through  the  network
       daemon saned(8).

       If  the  Mustek backend blocks while sending the inquiry command to the
       scanner, add the option force-wait to mustek.conf.

       Also note that after a while of no activity, some  scanners  themselves
       (not the SANE backend) turns off their CCFL lamps. This shutdown is not
       always perfect with the result that the  lamp  sometimes  continues  to
       glow  dimly  at  one  end. This doesn’t appear to be dangerous since as
       soon as you use the scanner again, the lamp turns back on to the normal
       high brightness. However, the first image scanned after such a shutdown
       may have stripes and appear to be  over-exposed.   When  this  happens,
       just take another scan, and the image will be fine.


              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.
              Higher debug levels increase the verbosity of the output.

              Value  Description
              0      no output
              1      print fatal errors
              2      print important messages
              3      print non-fatal errors and less important messages
              4      print all but debugging messages
              5      print everything

              Example: export SANE_DEBUG_MUSTEK=4


       sane(7),   sane-find-scanner(1),   sane-scsi(5),    sane-mustek_usb(5),
       sane-gt68xx(5), sane-plustek(5), sane-mustek_pp(5)


       David  Mosberger, Andreas Czechanowski, Andreas Bolsch (SE extensions),
       Henning Meier-Geinitz, James Perry (600 II EP).


       Scanning with the SCSI adapters supplied by Mustek is very slow at high
       resolutions and wide scan areas.

       Some scanners (e.g. Paragon 1200 A3 + Pro, SE A3) need more testing.

       The  gamma table supports only 256 colors, even if some scanners can do

       More detailed bug  information  is  available  at  the  Mustek  backend

                                  13 Jul 2008                   sane-mustek(5)