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TTU-2900 Hardware & Installation Guide - PULS Wiki
Be certain that the cables running to the LMU will not be bent or constricted. Damage to the cables may impede the LMU’s
performance.
Be certain that the installation point will not violate any of the LMU’s environmental specification (temperature, moisture, etc…) as
improper installation of the LMU may void the warranty.
See the LMU Environmental Specifications for the exact measurements and specifications of the TTU-2900
™
.
Typical installations will place the LMU under the vehicle dash board, or in the trunk. Make sure you can get access to the unit afterwards as
under some circumstances it may be necessary to add additional wiring or connections to the LMU.
5.4.2
Access to the SIM (Subscriber Identity Module) Card
When used in a LTE or HSPA, each LMU uses a Subscriber Identity Module (SIM) card, which should be inserted before you install the LMU for
the first time. The SIM card is attached to the main-board inside the housing of the LMU unit.
At some future time, you might need or want to replace the SIM card with a different one, so try to install the LMU in such a way that the cover
can be removed to make the SIM card accessible.
5.4.3
Protection from Heat
It is best not to place the LMU unit in an unusually warm location such as directly near heater vents, near hot engine components or in direct
sunlight. The maximum temperature that can be tolerated by the LMU is described in the LMU Environmental Specifications section.
5.4.4
Visibility of Diagnostic LEDs
Status LED lights on the front of the LMU unit can provide valuable information about the operation of the LMU. When feasible, attempt to
install the LMU 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 LMU is operating properly. If at any time you should
encounter a problem with the LMU, you may need to read the LEDs in order to troubleshoot the problem. If you cannot fix the LMU yourself, you
will need to provide the LED information to CalAmp customer support.
For information about how to interpret the LEDs, see the Status LED Behavior section.
5.4.5
Cable Length
Do not cut cables. Instead, coil any excess length, making sure not to crimp or flatten any cable.
5.4.6
Moisture and Weather Protection
The LMU 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 LMU below a car’s cup holders, or where rain might easily splash into the
compartment when a door is opened.
5.4.7
Preventing Accidental or Unauthorized Modification
If you anticipate that fleet drivers or others might interfere with the LMUs once they are installed, take steps to be sure that it is not easy to
remove the LMU from its power source, or disrupt internal antenna interference.
Two common methods are the use of Tamper Proof Sealant or creation of PEG Script to detect power loss or GPS antenna disconnections.
5.5
Installing the LMU in a Vehicle
This section provides instructions for installing an LMU in a vehicle.
Be sure to consider the design decisions described in the previous sections. When you are ready to begin installing the LMU, follow these steps:
5.5.1
Place the TTU-2900 in the vehicle.
The TTU-2900 contains an internal battery, and thus should be oriented with the label facing upwards towards the sky. LMUs with internal
antennas should be placed directly under a thick panel to maximize their performance and protect from external elements. A typical location
