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[root@localhost xyz]# sane-find-scanner
  # sane-find-scanner will now attempt to detect your scanner. If the
  # result is different from what you expected, first make sure your
  # scanner is powered up and properly connected to your computer.
  # No SCSI scanners found. If you expected something different, make sure that
  # you have loaded a kernel SCSI driver for your SCSI adapter.
  # Also you need support for SCSI Generic (sg) in your operating system.
  # If using Linux, try "modprobe sg".
could not fetch string descriptor: Pipe error
  # No USB scanners found. If you expected something different, make sure that
  # you have loaded a kernel driver for your USB host controller and have setup
  # the USB system correctly. See man sane-usb for details.
  # Not checking for parallel port scanners.                                                                                                                           
 
  # Most Scanners connected to the parallel port or other proprietary ports
  # can't be detected by this program.

[root@localhost xyz]# lsusb
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 006: ID 0cf3:3004 Atheros Communications, Inc. AR3012 Bluetooth 4.0
Bus 001 Device 004: ID 13d3:5727 IMC Networks
Bus 001 Device 003: ID 1a40:0101 Terminus Technology Inc. Hub
Bus 001 Device 002: ID 062a:4101 Creative Labs Wireless Keyboard/Mouse
Bus 001 Device 007: ID 04f9:60e0 Brother Industries, Ltd
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

[root@jabztop jibz]# cat /etc/udev/rules.d/* | grep 04f9

[root@jabztop jibz]# cat /etc/udev/rules.d/* | grep 04f9
SYSFS{idVendor}=="04f9", GOTO="brother_mfp_udev_2"
ATTRS{idVendor}=="04f9", GOTO="brother_mfp_udev_2"
ATTRS{ifVendor}=="04f9", ENV{libsane_matched}="yes"

[root@localhost xyz]# cat /etc/udev/rules.d/*
KERNEL=="sg[0-9]*", ATTRS{type}=="0", ATTRS{vendor}=="Brother", ATTRS{model}=="DS-620", MODE="0666", GROUP="users"
KERNEL=="sg[0-9]*", ATTRS{type}=="0", ATTRS{vendor}=="Brother", ATTRS{model}=="DS-720D", MODE="0666", GROUP="users"
KERNEL=="sg[0-9]*", ATTRS{type}=="0", ATTRS{vendor}=="Brother", ATTRS{model}=="DS-820W", MODE="0666", GROUP="users"
KERNEL=="sg[0-9]*", ATTRS{type}=="0", ATTRS{vendor}=="Brother", ATTRS{model}=="DS-920DW", MODE="0666", GROUP="users"