5.2.5 Visibility of Diagnostic LEDs
Status LED lights on the front of the TTU unit can provide valuable information about the operation of
the TTU. When feasible, attempt to install the TTU in such a way that these lights can be seen with
reasonable ease.
You may find it useful to be able to view the LEDs periodically to make sure that the TTU is operating
properly. If at any time you should encounter a problem with the TTU, you may need to read the LEDs
in order to troubleshoot the problem. If you cannot fix the TTU yourself, you will need to provide the
LED information to CalAmp customer support.
For information about how to interpret the LEDs, see the
5.2.6 Cable Length
The RF cables which are provided for connecting to the TTU antennas should be used at the length
provided. Do not cut cables. Instead, coil any excess cable length, making sure not to crimp or flatten
the antenna cable
5.2.7 Moisture and Weather Protection
The TTU unit must be located where it will not be exposed to moisture or water. In a typical installation
inside a vehicle this is not commonly thought to be a concern; however, it might be best to avoid
locating the TTU
below a car’s cup holders, or where rain might easily splash into the compartment
when a door is opened.
5.2.8 Preventing Accidental or Unauthorized Modification
If you anticipate that fleet drivers or others might interfere with the TTUs once they are installed, take
steps to be sure that it is not easy to disconnect the antenna wiring, remove the TTU from its power
source, etc.
Two common methods are the use of Tamper Proof Sealant or creation of PEG Script to detect power
loss or GPS antenna disconnections.
5.3 Installing the TTU in a Vehicle
This section provides instructions for installing an TTU in a vehicle.
Be sure to consider the design decisions described in the previous sections. When you are ready to
begin installing the TTU, follow these steps:
5.3.1 Place the TTU unit in the vehicle.
Typically, the TTU should be placed under the passenger seat or dashboard of the vehicle. TTUs with
internal antennas should be placed to maximize their GPS performance. A typical location include
under the dash close to the front wind-shield.