10/12/13
TTU-12x0 Hardware & Installation Guide - PULS Wiki
https://puls.calamp.com/wiki/TTU-12x0_Hardware_%26_Installation_Guide
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The ignition input (white wire) must be connected to the vehicle ignition or another appropriate key operated line, such as
ACCESSORY, ensuring that power to the ignition wire is available only when the vehicle ignition is on.
The ground line (black wire) must be connected to chassis ground.
Failure to connect these lines in the manner described may result in discharge of the vehicle battery.
For best results, it is strongly recommended that the LMU connection be on its own circuit. Connect the power input directly
to the vehicle battery if possible and protect the circuit with an inline fuse. If you must connect through the fuse box, use
standard commercial wiring practices to create a permanent installation rather than using press-in fuse clips or other temporary
measures.
DO NOT connect the power cable to the LMU at this time.
5.3.3 Place the GPS antenna.
The GPS antenna must have a clear view of the sky. Mount the GPS antenna on the vehicle’s highest point (for example, the
roof of a car). Make sure that there are no obstructions close to the antenna that might block the view 360° to the horizon.
Air horns lights, vents, etc.. should not block the antenna beyond 5° above the horizon.
Kinks or knots in the antenna cable can prevent the GPS receiver from operating properly. When laying out the antenna
cable, take care that the cable is not subjected to crushing or strain.
The ideal location is typically near the center of the vehicle’s roof. However, it is also desirable to locate the cellular antenna
as far from the GPS antenna as possible.
GPS Antenna Location
5.3.4 Mount the Comm. Antenna.
When using separate Comm and GPS antennas, it is best to locate the Comm. Antenna at least 3 feet from the GPS antenna.
Ensure that the cable is not crushed during installation or normal vehicle operation.
Again, the Comm. Antenna must be located at least 20cm away from vehicle passengers, other personnel, or bystanders in
order to comply with FCC radio frequency exposure limits.
