sane-mustek - SANE backend for Mustek SCSI flatbed scanners (and some
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 MFC-600S, 600 II CD, ScanMagic 600 II SP
Paragon MFC-800S, 800 II SP
Paragon MFS-1200SP, MFS-12000SP
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 firstname.lastname@example.org. 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
http://www.sane-project.org/mailing-lists.html 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:
SCSI ADAPTER TIPS
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 http://www.meier-geinitz.de/sane/mustek-backend/#SCSI.
PARALLEL PORT SCANNERS
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
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
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.
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)