kopia lustrzana https://gitlab.com/sane-project/backends
100 wiersze
3.3 KiB
Groff
100 wiersze
3.3 KiB
Groff
.TH sane-scsi 5 "16 Aug 2001"
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.IX sane-usb
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.SH NAME
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sane-usb - USB configuration tips for SANE
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.SH DESCRIPTION
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This manual page contains tips and tricks on how to access scanners
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with a USB interface.
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.SH GENERAL INFO
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Sane-backends currently use three methods of communicating with USB scanners:
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.TP 2
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-
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Using libusb (a library for usb access). This is used by the sm3600 backend
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currently.
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.TP
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-
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Access through sanei_usb, the SANE USB interface. Used by the mustek_usb
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backend.
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.TP
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-
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Direct access to the USB device files to access kernel scanner drivers
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.PP
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This manual page describes the access of USB scanners over the sanei_usb
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interface. For point 1 and three of this list have a look at the backend's
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manual page for details.
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.PP
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Currently USB access is only tested for Linux and FreeBSD.
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.PP
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For scanners with a USB interface, it may be necessary to edit the
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appropriate backend configuration file before using SANE for the first time.
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For most systems, the configuration file should list the name of the USB
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device file that the scanner is connected to (e.g., under Linux,
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.B /dev/usb/scanner0
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or
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.B /dev/usbscanner0
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is such a USB device, the device file for FreeBSD is e.g.
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.BR /dev/uscanner0 ).
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Do
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.I not
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create a symlink from
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.B /dev/scanner
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to the USB device because this link is used by the SCSI backends. The scanner
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may be confused if it receives SCSI commands. For a detailed description of
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each backend's configuration file, please refer to the relevant backend manual
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page (e.g. sane-mustek_usb Mustek USB scanners).
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.PP
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For Linux, there is an alternate way of specifying scanner devices. This
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alternate allows to identify scanners by the USB vendor and product numbers.
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The syntax for specifying a scanner in this way is:
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.PP
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.RS
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usb
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.I VENDOR PRODUCT
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.RE
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.PP
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where
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.I VENDOR
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is the USB vendor id, and
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.I PRODUCT
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is the USB product id of the scanner. Both ids are non-negative integer
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numbers in decimal or hexadecimal format. The correct values for these fields
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can be found by looking at the output of the command "cat
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/proc/bus/usb/devices/". This is an example of a config file line:
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.PP
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.RS
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usb 0x055f 0x0006
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.RE
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.PP
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would have the effect that all USB devices in the system with a vendor id of
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0x55f and a product id of 0x0006 would be probed and recognized by the
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backend. The same config line in decimal format looks like this:
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.PP
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.RS
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usb 0x055f 0x0006
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.RE
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.PP
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When using a USB scanner, ensure that the access permission for the
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USB device is set appropriately. We recommend to add a group
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"scanner" to /etc/group which contains all users that should have
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access to the scanner. The permission of the device should then be
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set to allow group read and write access. For example, if the scanner
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is at USB device
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.BR /dev/usb/scanner0 ,
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then the following two commands would set the permission correctly:
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.PP
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.RS
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$ chgrp scanner /dev/usb/scanner0
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.br
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$ chmod 660 /dev/usb/scanner0
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.SH ENVIRONMENT
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.TP
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.B SANE_DEBUG_SANEI_USB
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If the library was compiled with debug support enabled, this
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environment variable controls the debug level for the USB I/O
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subsystem. E.g., a value of 128 requests all debug output to be
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printed. Smaller levels reduce verbosity.
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.SH "SEE ALSO"
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sane(7), sane\-find\-scanner(1), sane\-"backendname"(5), sane-scsi(5)
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.SH AUTHOR
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Henning Meier-Geinitz. Some parts were copied from the sane-scsi manual page.
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