XT55 AVL User’s Guide
Confidential/Released
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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 1
st
, 1997.
4.1 NMEA output messages
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.
4.2 How to switch the XT55 AVL in the command mode and vice
versa
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.
