Display location data base on reports received from the HMU-3640
™
in a variety of formats.
Present historic information received from the HMU-3640
™
typically in a report/chart style format
Request location updates from one or more HMU-3640
™
Update and change the configuration of one or more HMU-3640
™
2.2.2 LMU Manager
LMU Manager is the primary support and configuration tool in the CalAmp system. It allows access to almost every feature
available to the
HMU-3640
™
. Unlike the backend software, it has the option of talking directly to an HMU-3640
™
or making a request
forwarded by the LM
Direct server.
For further details on using LMU Manager, please refer to the LMU Manager Users Guide.
2.2.3 LM Direct Server
LM Direct is a message interface specification detailing the various messages and their contents the HMU-3640
™
is capable of
sending and
receiving. This interface allows System Integrators to communicate directly with HMU-3640
™
s.
Sample code is available to system integrators upon request to aid in the development of an LM Direct Server.
2.2.4 Wireless Data Network
The Wireless Data Network provides the information bridge between the LM Direct server and the HMU-3640
™
s. Wireless data
networks can
take a variety of forms, such as cellular networks, satellite systems or local area networks. At this point in time, the networks
available to the
HMU-3640
™
are:
4G LTE
https://puls.calamp.com/wiki/HMU-3640_Hardware_%26_Installation_Guide 4/27
2.2.5 HMU-3640
™
The HMU-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 HMU-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 HMU-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.
2.3.2 LTE (Long-Term Evolution)
Long-term evolution (LTE) is the latest and rapidly growing global data transmission technology. Based on GSM and
UMTS/HSPA standards,
LTE is a standard of high-speed wireless data transmission and communication. Continuously evolving, LTE advancements
continue to push data
capacity and user experience on a global scale. With a peak downlink rate of 300 mbps, uplink rate of 75 mbps, LTE sits in 1.4
MHz to 20 MHz
bands, while also supporting FDD, TDD, and not sacrificing data capability.
"Both LTE FDD and TDD offer very high data rates, low latency, and seamless interworking with 3G, as well as between FDD
and TDD
networks. They also leverage common core network." (Excerpt taken from the Qualcomm website
