XT55 GPS Startup User’s Guide
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Contents
Introduction...................................................................................................................5
1.1 Related documents................................................................................................5
1.2 Terms and abbreviations .......................................................................................6
2.1 Terminal emulator setup........................................................................................7
2.2 Evaluating GPS data using SiRFdemo software ...................................................9
Hardware components overview...............................................................................13
Figures
Figure 1: Assign the name for a new session ..........................................................................7
Figure 2: COM port transmission settings................................................................................8
Figure 3: Displaying the transmitted NMEA protocols..............................................................8
Figure 4: COM port selection ...................................................................................................9
Figure 5: SiRFstar demo on selected COM port ....................................................................10
Figure 6: Development data screen .......................................................................................10
Figure 7: Updating GPS data in Map view .............................................................................11
Figure 8: Downloading XT55 AVL software ...........................................................................12
Figure 9: Block diagram of XT55 for SiRF Demo application.................................................13
Figure 10: Block diagram of XT55 with AVL or TCP/IP application (optional)........................13
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1 Introduction
This brief guide explains how to establish a GPS connection using the XT55 module.
The Global Positioning System (GPS) is a world-wide navigation system form from 24
satellites. It uses at least 4 satellites as reference points to calculate the current position.
The GPS receiver embedded in the XT55 module constantly tracks all satellites in view, thus
providing accurate satellite position data.
It allows a quick and uncomplicated configuration and evaluation by the user via local
RS-232 interface (directly connected to the serial port) or via remote (e.g. installed in a
vehicle) GSM (air link).
With Windows HyperTerminal application (utility that is pre-installed on all versions of
Windows 98, 98SE, Windows ME, Windows NT, and Windows 2000) it is possible to receive
GPS position data and alarm status reports, as well as to execute a range of remote
configurations. If the XT55 is configured remotely, prerequisite is the connection of a suitable
GSM modem.
1.1 Related documents
[1] XT55 AT Command Set
[2] XT55 Hardware Interface Description
[3] XT55 GPS Command Specification
[4] XT55 AVL Software Instructions User’s Guide
[5] GPRS Startup User's Guide
[6] Remote-SAT User's Guide
[7] GSM / GPS Evaluation Board Description
[8] Application Note 16: Upgrading XT55 Firmware
[9] Application Note 14: Audio and Battery Parameter Download
[10] Application Note 02: Audio Interface Design
[11] Multiplexer User's Guide
[12] Multiplex Driver Developer’s Guide for Windows 2000 and Windows XP
[13] Multiplex Driver Installation Guide for Windows 2000 and Windows XP
[14] Application Note 24: Application Developer’s Guide
Prior to using the XT55 engines or upgrading to a new firmware release, be sure to carefully
read the latest product information.
To visit the Siemens Website you can use the following link:
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1.2 Terms and abbreviations
Abbreviation Description
AVL
Automatic Vehicle Location
Bit per Second
bps
CRLF
GPI
Carriage Return/Line Feed
General Propose Input
GPS
GSM
NMEA
Global Positioning System
Global Standard for Mobile Communications
National Maritime Electronics Association
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2 Getting started
Please ensure that the XT55 module connects properly to the application platform. In order
to prevent mechanical damage, be careful not to force, bend or twist the module.
2.1 Terminal emulator setup
The example below is based on the Windows HyperTerminal application (terminal emulator
program), but XT55 can also be configured using other terminal programs. The XT55 is used
with a PC running Windows 2000.
At the first power-up you can use the terminal software, which establishes the
communication with a modem via a RS-232 serial port. The following example uses the
Hyper Terminal program in Windows 2000.
On Windows 2000, start the Hyper Terminal program. Assign the name for a new session on
the displayed window (e.g. XT55).
Figure 1: Assign the name for a new session
Press the OK button and select a COM port.
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The appearing dialog box shows the default settings for the selected COM port.
NOTE: The pre-defined factory settings of the XT55 GPS port SDn1 (4800bps, 8 data bits,
no parity, 1 stop bit, no flow control) cannot be changed, otherwise no connection to the
XT55 GPS port will be established.
Figure 2: COM port transmission settings
If a connection to the XT55 module has been established, the transmitted protocols will be
displayed.
Figure 3: Displaying the transmitted NMEA protocols
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2.2 Evaluating GPS data using SiRFdemo software
To evaluate GPS data it is necessary to use special GPS software like the provided
SiRFDemo software. Below you can find all information you need for downloading the
SiRFDemo software.
•
•
•
Before running the software, ensure that your PC is recognizing the XT55 module
properly. In order to receive satellite signals, the XT55 must be placed in such way that
the receiver has a clear view of the sky.
To start the SiFRDemo software either double click the SiRFdemo.exe file or, if you have
created a short cut to your desktop, click on the SiRFdemo icon. The SiRFDemo program
will be automatically installed onto your computer.
On the activated Data Source Setup window, select the COM port (e.g. COM5) for
SiRFdemo program and set the baud rate to 9600 bps.
Figure 4: COM port selection
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•
Click the Connection/Disconnection icon on the toolbar by the up-down button (see
evaluating.
Click this button to
open and close the
connection.
Figure 5: SiRFstar demo on selected COM port
•
The output messages can be viewed in the Development Data screen. For a description
$GPRMC protocol as shown in figure below. The capital letter “A” means, incoming
protocols are valid while the capital letter “V” means incoming protocols are invalid.
Figure 6: Development data screen
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•
If the XT55 module is receiving valid GPS positions, click the Map View icon on toolbar
by the up-down button (see marked button in figure below), the user can see the updated
data of longitude, latitude, altitude, date time etc.
Figure 7: Updating GPS data in Map view
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2.3 Downloading AVL software into the XT55 module
For downloading the XT55 AVL software it is recommended to use the provided SiRFflash
software. It is a fast in-circuit flash memory programming utility. It needs a serial line to
communicate with the target system and supports a great variety of flash chips.
To download the XT55 AVL software it is recommended to follow the given instruction:
•
•
•
•
•
•
•
Press button 3 to reset the XT55 module.
Start the SiRFflash software by double-clicking on the SiRFflash.exe.
Select the GPS COM port.
To start the download procedure press the “EXECUTE” button.
Once the download has completed the confirmation message “Flash successfully
programmed” appears.
•
•
•
The XT55 module must be disconnected from its power supply.
Reconnect the XT55 module to the provided power supply source.
Choose “EXIT” to close the SiRFflash software.
Figure 8: Downloading XT55 AVL software
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