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LA000510C © 2006 Navman NZ Ltd. All rights reserved. Proprietary information and specications subject to change without notice.
Figure 4-1 Development Unit test equipment
The Development Unit should be set up as shown in Figure 4-1 with only the RTCM correction
source connected to the receiver. If the RTCM cable is not connected to the receiver’s auxiliary
port, DGPS operation will not be possible. When RTCM data is being received the AUX LED will
be lit.
Note: the Development Unit may be connected to either the COM1, COM2, COM3, or COM4
serial ports and the RTCM differential correction data source connected either directly to
the receiver’s auxiliary I/O port, to one of the remaining serial ports of the PC, or to both
using an OEM-supplied three-connector serial cable.
4.4 Operating the GPS Analyser software
There are two software packages supplied with the GPS Development kit: SiRFDemo and
SiRFFlash. The VisualGPS program can be obtained free of charge from the VisualGPS website
(www.visualgps.net/VisualGPS/).
4.4.1 VisualGPS
VisualGPS graphically presents the serial data transmitted by the receiver. The receiver output
must be enabled in the NMEA protocol for this software to be used.
To enable the receiver output
1. Open the VisualGPS software installed on the PC.
2. Select the Settings>Communications tab.
3. When the Communications Settings window is displayed, select the correct COM Port and set
the Baud rate to 9600 Baud.
When this has been carried out, and the Development Unit is powered, raw NMEA data should
appear in the NMEA Monitor Window. For more detailed information on any of the analysis
windows, use the Help function in the top toolbar.
4.4.2 SiRFDemo
SiRFDemo software can provide analysis of receiver output in either SiRF binary or NMEA
protocols. When enabled in NMEA format, the only analysis provided is raw data being
transmitted by the receiver. While the module is transmitting serial data in NMEA format, it is
suggested that VisualGPS is used for analysis, rather than SiRFDemo.
To provide graphical presentation of the data, the receiver can be set to output in SiRF binary
format.
RTCM DGPS
data source
optional connection for logging RTCM data
monitor
antenna
power
optional antenna
or pre-amplier
development unit
PC