General
Description:
The
SM105 interface module has been designed to filter and extend
12VDC from a motor vehicle battery source to a camera / TFT
monitor installation
with either
one or two cameras. The filter is a network of inductors, capacitors and transient
protection devices which will ensure that spikes and ripple present on the
vehicle battery supply will not be extended to a camera or
monitor module. If not filtered,
such noise can corrupt video quality and in the extreme, damage the display
or camera
A 2Amp fuse (M205 format) provides short circuit and reverse polarity protection
to the camera and display. A small red LED indicator next to the fuse is active
whenever power of the correct polarity is connected.
Installation
The module has a two way screw terminal next to the fuse holder that should
be connected to the + and – of the vehicle battery. Ideally this should
be a cable running directly to the battery terminals to further reduce noise
and
voltage drop problems.
The 12VDC output appears at both a screw terminal and a DC coaxial power socket
(centre pin is positive)
IMPORTANT – The chassis of the camera and the monitor should not be earthed
to the vehicle body. This is for noise reduction purposes as the negative output
of the module has also been filtered within the module.
The ribbon cable that attaches the module to the display is connected by flat
ribbon cable sockets. The cable should not be forced into these sockets. The
black locking strip on the leading edge of the socket entry can be eased out
a couple of millimetres to allow the ribbon cable to enter the connector. The
locking strip can then be pressed back into the home position.
Option Links
Two pair of links have been provided to mirror or flip the video as it appears
on the display independently for each camera. This allows a rear-mounted
camera on a vehicle to simulate a rear-vision-mirror. The link can also be
used to flip video up/down should the display be physically installed in
an inverted position. The camera selection is made by actuating an external
contact. In this way the camera select may be connected to the forward/reverse
direction shift on the vehicle to select forward/reverse views.
