Siemens XT55 AVL 4 Software interface

XT55 AVL User’s Guide

Confidential/Released s

mo b i l e

XT55_avl_ug_V03 Page 34 of 37 28.06.2004

4 Software interface

The module XT55 is capable of outputting data in the NMEA-0183 format as defined by the

National Marine Electronics Association (NMEA), Standard for Interfacing Marine Electronic

Devices, Version 2.20, January 1st, 1997.

The table below shows all NMEA output messages supported by the module XT55 as well as

a brief description of each output message.

Option Description

GGA Time, position and fix type data.

GLL Latitude, longitude, UTC time of position fix and status.

GSA GPS receiver operating mode, satellites used in the position solution and DOP

values.

GSV The number of GPS satellites in view satellite ID numbers, elevation, azimuth and

SNR values.

RMC Time, date, position, course and speed data.

VTG Course and speed information relative to the ground.

While running XT55 AVL software the module can be easily switched back and forth from

GPS mode to command mode.

To set the XT55 module to command mode enter the AT#1<enter> command. It should be

mentioned that while entering the AT command the module still receives GPS data and the

typed characters will not de displayed on the screen.

In order to switch the echo mode on the command ATE1<enter> has to be sent.

The XT55 module can be switched back to GPS mode by issuing the AT#0<enter>

command.

NOTE: Hardware handshake on the terminal software should be deactivated, otherwise the

commands are ignored from the terminal software.