This file is indexed.

/etc/sane.d/dc210.conf is in libsane-common 1.0.27-1~experimental3ubuntu2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# Serial port where the camera is connected
## Linux
port=/dev/ttyS0
## IRIX
#port=/dev/ttyd1
## Solaris
#port=/dev/term/a
## HP-UX
#port=/dev/tty0p0
## Digital UNIX
#port=/dev/tty01
# Max baud rate for download.  Camera always starts at 9600 baud, then
# switches to the higher rate
## This works for Linux. Also works for IRIX (6.3 or higher), providing that
## the host is an O2, OCTANE, Origin2000/200, Onyx2, Origin3000/300, Onyx3 or
## a newer SGI hardware [see serial(7)].
#baud=115200
## This works for most UNIX's
baud=38400
# Prints some extra information during the init phase.  This can be
# handy, but note that printing anything to stderr breaks the saned 
# network scanning.
#dumpinquiry
# How many usec (1,000,000ths of a) between writing the command and reading the
# result. 125000 seems to be the lowest I could go reliably.
cmdrespause=125000
# How many usec (1,000,000ths of a) between sending the "back to default" break
# sending commands.
breakpause=1000000;