/etc/sane.d/dc25.conf is in libsane-common 1.0.24-8+deb8u2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 | # 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
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