5 Troubleshooting
40 AgGPS 252 Receiver User GuideNo GPS position output from the
receiver after connecting to
AgRemote
When the receiver is connected to
the AgRemote utility, AgRemote
automatically resets the port
communication settings on the
receiver to 8-O-1 TSIP 115K for both
input and output. This enables
optimal communication with an
office computer.
If the receiver is to work with an
Autopilot system, however, the
receiver port communication
settings must be 8-N-1 TSIP 38.4K.
To work with some other devices
and software programs, the receiver
port communication settings must
be
8-N-1 NMEA 4800. If AgRemote has
changed the settings, you will need
to change them back manually.
Connect AgRemote. Then reset the port
communication settings to NMEA output. For more
information, see Configuring the Communication
Ports, page31.
Long time to initialize
In RTK mode, longer baselines
require longer initialization times.
(The baseline is the distance
between the base receiver and the
rover receivers.)
Wait for the receiver to initialize or consider
repositioning the base receiver to shorten the
baseline. Make sure the rover is in a clear area.
Loss of initialization
In RTK mode initialization can be
lost when the rover receiver is close
to trees or buildings and the number
of satellites falls below four.
Additionally, initialization may be
lost if the receiver has not been
tracking RTK corrections for some
time. For more information, see the
next item.
Move away from trees and obstructions to initialize.
Once initialized, approach the obstructed area
again. If the obstructions are severe, GPS positioning
may not work in that area.
Because the GPS satellites move, there may be times
of the day when you are working in an area with
obstructions. For more information, see the Trimble
Planning software on the Trimble website
(www.trimble.com).
Problem Possible solution
Ag252_100B_UserGuide_ENG.book Page 40 Thursday, July 28, 2005 4:06 PM