Ag Leader GPS 1500 Operators Manual - Manual (Page 14)

F
ACTORY PARAMETERS
Serial Port Settings
This table identifies default settings for the GPS 1500 configuration.
Serial Port
Baud
Rate Data
Bits
Parity Stop Bit
Interface
Levels
Update Rate
Serial port A 4800
9600
19200
38400
8 None 1 RS-232C 1 to 10 Hz
T
ROUBLESHOOTING
LED S
TATUS
I
NDICATORS
The GPS 1500 uses one tri-colored LED, which indicates important status information.
• Red indicates the power is on
• Amber indicates a GPS lock
• Flashing green indicates DGPS is being acquired
• Green indicates a DGPS solution
V
ERIFYING
D
IFFERENTIAL
GPS S
IGNAL
Differential GPS (DGPS) is a data collection technique that uses extra GPS receivers and some
complex calculations to increase the accuracy of GPS positions. DGPS is made possible because of an
enhancement to the Global Positioning System that uses a network of fixed, ground-based reference
stations to broadcast the difference between the positions indicated by satellite systems and other
known fixed positions.
You should periodically check the monitor to ensure that you are receiving a Differential GPS signal, as
this could affect the quality of the data you are logging. As an example, your GPS receiver must track
four or more satellites to get an elevation reading.
T
ROUBLESHOOTING
C
HECKLIST
The following is a checklist to troubleshoot common problems and their solutions for the GPS 1500.
Receiver fails to power
• Verify polarity of power leads
• Check integrity of power cable connections
• Check power input voltage (7 - 36 VDC)
• Check current restrictions imposed by power source (maximum is 250
mA) No data from receiver
• Check receiver power status (LED)
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