XT55 AVL Software Instructions User’s Guide
Confidential/Preliminary s
mo b i l e
XT55_avl_ug_V01 Page 5 of 20 15.03.2004
1 Overview of Document
XT55 is a Plug & Play GSM/GPS device, which contains a software application named AVL
that can be configured. The concept of the device is based on a simple implementation for a
wide range of applications with low costs and high flexibility. In particular it offers a fast
development of systems solutions within the fields of:
· Tracking
The vehicle to be tracked is fitted with the module XT55 and an antenna. GPS satellites
are continuously transmitting a radio message containing information, including when the
data was sent, which satellite sent it and the current reliability of the system. The XT55-
AVL fitted in the vehicle receives this information from at least 4 satellites and carries out
the necessary calculations to determine its current position.
· AVL
The embedded GPS receiver into the module XT55 determines its current location,
speed and heading. This data can be stored or can be directly transmitted to an
operating centre. The terminal reports its position to the Base Station over GSM
communications network. Current position can be displayed on a PC/PDA in digital
maps.
Depending on the configuration, the device exchanges data with a server application (e.g.
Mapping-Software, etc.). The module XT55 can be configured by the user via local RS232-
interface or via remote GSM (air link).
At the core of the above-mentioned system solutions is a classical set-up with client-server
architecture. In this scenario, the module XT55 represents the so-called mobile client (see
Figure 1).
The integration of the module XT55 requires a clear definition:
- The characteristics of the integrated AVL software solution of the module XT55 as a
client of the user solution, and the possibilities for configuration.
- The instruction command for communicating with the client as the main part of the
server application
This document seeks to describe the module XT55 firmware and its possibilities for
configuration, including the description, which is based on the WindowsÔ HyperTerminal
configuration (terminal emulator program).
Furthermore, in this document you will find a detailed description of the instruction
command, providing a foundation for the set-up of own server applications for
communicating with the mobile client (XT55).