Manpage of sane-umax_pp


Section: SANE Scanner Access Now Easy (5)
Updated: 15 February 2002
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sane-umax_pp - SANE backend for Umax parallel port flatbed scanners  


The sane-umax_pp library implements a SANE (Scanner Access Now Easy) backend that provides access to Umax parallel port flatbed scanners. The following scanners work with this backend:

Astra 1220P
Astra 1600P
Astra 2000P

This backend handles 75x75, 150x150, 300x300, 600x600 and 600x1200 dpi scan resolutions, in color and gray levels. There is a software lineart mode.

These scanners share the same ASIC. Only parts such as CCD and ADC change from one to another. They even all reports being UMAX Astra 1220P via IEEE1284. There isn't software way to recognize them properly. Under windows, model is set by the driver installed, regardless of the hardware.

The current version of the backend use only EPP mode to communicate with the scanner. PS/2 and SPP mode aren't implemented. It is recommended that you set your parallel port to EPP in BIOS with the current version of this backend. ECPEPP will only work if you use a 2.4 kernel with ppdev character device support.

This backend does support parport sharing only if you have a kernel with ppdev support.

Note that if you don't use the ppdev character device, the backend needs to run as root. To allow user access to the scanner run the backend through the network interface (See saned(1) and sane-net(5)). A more relaxed solution (security wise) is to add suid bit to the frontend (See chmod(1)). The backend drop root priviledges as soon as it can, right after gaining direct access to IO ports, which lessen risks when being root.



This backend expects device names of the form:

port value

Where value is the base address, or the ppdev device name of the port your scanner is attached to. Known ports are 0x378 (lp1) 0x278 (lp2) and 0x3BC (lp0). Note that if you are using a Kernel 2.2.x or better , the first parallel port is named lp0 regardless of the base address. However, this backend requires the base address of your port. If you are not sure which port your scanner is connected to, have a look at your /etc/modules.conf.

If you are using the linux ppdev character device, you will have to specify the device name, which is /dev/parport0 for the first parallel port. Check the permissions on /dev/paraport0, many linux distributions restrict them for root only access. Get sure they are like:
crw-rw-rw- 1 root root 99, 0 mai 20 2002 /dev/parport0
crw-rw-rw- 1 root root 99, 1 mai 20 2002 /dev/parport1
crw-rw-rw- 1 root root 99, 2 mai 20 2002 /dev/parport2
crw-rw-rw- 1 root root 99, 3 mai 20 2002 /dev/parport3

You can rename any device using the

name devname
model model
vendor vendor

options. These options apply to the last port option.



Please make sure to edit umax_pp.conf before you use the backend.

The contents of the umax_pp.conf file is a list of options and device names that correspond to Umax scanners. Empty lines and lines starting with a hash mark (#) are ignored.

The height options supported are red-gain, green-gain, blue-gain, red-highlight, green-highlight, blue-highlight, astra, and buffer.

Options red-gain , green-gain and blue-gain allow you to adjust the sensitivy of your scanner for the given color. Values range from 0 (lowest gain) to 15 (highest). When all three gains are set to 0, the backend does auto gain tuning.

Options red-highlight , green-highlight and blue-highlight allow you to adjust the highlight of your scanner for the given color. Values range from 0 (lowest highlight) to 15 (highest).

Option astra allows you to change the model of your scanner. Current auto detection is based on side effects on scanning when using 1220P command set on other models, so it may fail on unkown hardware combination. Valid values are 1220, 1600 and 2000. It is usefull only autodetection fails to detect properly your scanner model. If your scanner work properly but is reported wrongly, let it be that way. The only valid case to change the model is when your scanner produces 'black' or
 'inverted' scans.  In this case you can put the model. Be aware that it will  prevent autodetection.

Option buffer allows you to change the size of the scan buffer. The size must be specified in bytes. The default value is 2 megabytes. Decreasing this value will improve the progress status reporting in the frontend, but will stall the scan more often.



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.

level debug output
------- ------------------------------

 0       nothing

 1       errors

 2       warnings & minor errors

 3       additional information

 4       debug information

 5       code flow (not supported yet)

 6       special debug information

This variable sets the debug level for the SANE interface for the Umax ASIC. Note that enabling this will spam your terminal with some million lines of debug output.

level debug output
------- -------------------------------

 0       nothing

 1       errors

 8       command blocks

 16      detailed code flow

 32      dump datafiles      

 255     everything




sane(7), sane-net(5), saned(1)

For latest bug fixes and information see



Stéphane VOLTZ <>, man page derived from mustek_pp man page by Jochen Eisinger <>



If something doesn't work, please contact me. But I need some information about your scanner to be able to help you...

SANE version
run "scanimage -V" to determine this
the backend version and your scanner hardware
run "SANE_DEBUG_UMAX=255 scanimage -L 2>log" as root. If you don't get any output from the umax_pp backend, make sure a line "umax_pp" is included into your /etc/sane.d/dll.conf. If your scanner isn't detected, make sure you've defined the right port address in your umax_pp.conf.
the name of your scanner/vendor
also a worthy information. Please also include the optical resolution and lamp type of your scanner, both can be found in the manual of your scanner.
any further comments
if you have comments about the documentation (what could be done better), or you think I should know something, please include it.




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Time: 01:40:40 GMT, March 05, 2024