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3000LRS DGPS RECEIVER
OPERATOR’S MANUAL
A Product of the Fugro Group of Companies
Issue 2.00 JUNE 2003
B11203400PMBRA0 / 10
Interfacing to External Equipment
Model 3000LRS
This model does not contain an internal GPS receiver and must be interfaced to
an external GPS receiver. To interface the Seastar receiver to an external GPS,
two-way communication needs to be established between both units:
•
The external GPS receiver sends NMEA data (GGA or GLL string) to the
Seastar receiver. The Seastar receiver will then compute optimised RTCM
corrections for the user’s location.
•
The Seastar receiver sends optimised RTCM corrections to the external
GPS receiver. These RTCM corrections enable the GPS receiver to
compute a differential corrected position.
The Seastar receiver uses the AUX port to send RTCM to, and receive NMEA
from, the external GPS receiver. The AUX port can only handle RS232 data.
Use the following procedures to interface the Seastar receiver to an external GPS
receiver:
1.
Connect the Seastar receiver (Aux. Port) to the external GPS receiver as
follows.
2.
ERTCM can also be output on the DATA Port (Pin 2) if required ,this is
selected in User Settings : Data Port.
Seastar
AUX Port
External GPS
Receiver Port
Pin 2 – Rx NMEA
Tx NMEA – Pin ?
Pin 3 – Tx RTCM
Rx RTCM – Pin ?
Pin 5 - Ground
GND – Pin ?
Use the operating manual of the external GPS receiver to find out the
correct pin numbers and make sure the external GPS receiver port can
operate with RS232 data. If the external GPS receiver port can only operate
with RS422 data Fugro Seastar AS can supply a RS232/422 converter.
3.
Ensure that the baud rate of the Seastar AUX port and the external GPS
receiver port match. The default baud rate of the Seastar AUX port is
4800,8,N,1. This can however be changed in the ‘User Settings’ menu of
the Seastar receiver.
4.
Ensure that the external GPS receiver is set-up for DGPS. Consult the
specific manual on how to do this.