9/27/2017
LMU-3640 Hardware & Installation Guide - PULS Wiki
https://puls.calamp.com/wiki/LMU-3640_Hardware_%26_Installation_Guide
4/23
LTE
2.2.5 LMU-3640™
The LMU-3640™ is responsible for delivering the location and status information when and where it is needed. Data requests can come from any
of the following sources:
PEG™ script within the LMU-3640™
A location or status request from the LM Direct server
A location or status request from LMU Manager
A request made from a host device such as a laptop, PDA or MDT
2.2.6 Host Device – Laptop/PDA or MDT
In some cases, it is necessary to run an application in the vehicle while it is being tracked by the backend software. Such examples could include
instant messaging between vehicles or a central office, in-vehicle mapping or driving directions, email or database access. In most of these cases
you will be using the LMU-3640™ as a wireless modem as well as a vehicle-location device.
2.3 Wireless Data Primer
This section is meant to give an overview of the wireless data technologies employed by the CalAmp location products.
2.3.1 SMS (Short Message Service)
“The Short Message Service (SMS) is the ability to send and receive text messages to and from mobile telephones. The text can comprise of
words or numbers or an alphanumeric combination. SMS was created as part of the GSM Phase 1 standard.(Excerpt taken from the GSM World
website (http://www.gsmworld.com/technology/sms/intro.shtml#1))
SMS message are typically text based, though binary messages are possible and can range in size from 140 characters to 256 characters depending
on the network being used.
3
Hardware Overview
3.1 LMU-3640™
3.1.1
Environmental Specifications
The LMU-3640™ is designed to operate in environments typically encountered by fleet vehicles, including wide temperature extremes, voltage
transients, and potential interference from other vehicle equipment.
To ensure proper operation in such an environment, LMU-3640™s were subjected to standard tests defined by the Society of Automotive
Engineers (SAE). The specific tests included temperature, shock, vibration, and EMI/EMC. These tests were performed by independent labs and
documented in a detailed test report. In accordance with Appendix A of SAE J1113 Part 1, the Unit is considered a “Functional Status Class B,
Performance Region II” system that requires Threat Level 3 Testing.
The following shows the environmental conditions the LMU-3640™ is designed to operate in and the relevant SAE tests that were performed. No
formal altitude tests were conducted.
Temperature
Operating Temperature Range: -30
o
C to 75
o
C
Storage Temperature Range: -40
o
C to 80
o
C
SAE Test: SAE J1455
Humidity
95% relative humidity, 50° non-condensing
SAE Test: SAE J1455
Altitude
Operates at altitudes of up to 10,000 feet and can be stored safely up to 40,000 feet
Shock and Vibration