Siemens XT55 AVL Manual De Usuario

XT55 AVL User’s Guide 
Confidential/Released 

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XT55_avl_ug_V03 

Page 34 of 37 

28.06.2004 

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 1

st

, 1997. 

The table below shows all NMEA output messages supported by the module XT55 as well as 
a brief description of each output message. 
 

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.