Digital BUS-WATCH
®
SD40
Page 25 of 72
Radio Engineering Industries, Inc.
640434 -- Rev 0 -- 9/30/2011
Accelerometer Module Harness
ACCELEROMETER MODULE
710143
ACC
TRIGGER
VIEW
REAR
ETHERNET
CAM 4
CAM 3
CAM 2
CAM 1
SENSORS
ACC
GPS
12V OUT
POWER
BUS-WATCH DVR, SD40
710292
Figure 13: Accelerometer Module Harness Connection
The optional external Accelerometer, or Inertia Sensor, must be hard mounted to
the vehicle floor, frame, or some other non-dampened part of the vehicle. The reason for
this is so that if external dampening is used for the DVR, it will not throw off the
Accelerometer readings.
To properly install the Accelerometer Module, the user must align the device with
the picture on top of the module as shown in Figure 14 below. The X axis is drawn from
the back to the front of the bus, the Y axis is drawn from the side of the bus to the other
side of the bus, and the Z axis is drawn from the bottom to the top of the bus. The
Accelerometer Module then needs to be calibrated as shown in
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Figure 14: 3 Axis Inertia Sensor Directions
