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LMU-2x20™ Hardware and Installation Guide
4.2.3 Access to the SIM (Subscriber Identity Module) Card
When used in a GSM or iDEN network, 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.
4.2.4 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.
4.2.5 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.
4.2.6 Cable Length
The RF cables which are provided for connecting to the LMU 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.
4.2.7 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.
4.2.8 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 disconnect the antenna wiring, remove
the LMU from its power source, etc.
V1.0.10
December 12, 2010
Copyright ©Calamp Wireless Networks Inc 2010
CalAmp Proprietary & Confidential
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