Download User Guide - Hemisphere GNSS

Appendix A: Troubleshooting
Table A-1 provides a list of issues with possible solutions to help you troubleshoot
anomalous A325 operation. Refer to Appendix B, “Technical Specifications” if
necessary.
Table A-1: Troubleshooting
Issue
Receiver fails to power
Possible Solution
•
Verify polarity of power leads
•
Check 1.0 A in-line power cable fuse connection
(only if the cable has a built in fuse)
•
Check integrity of power cable connections
•
Check power input voltage (7 - 36 VDC)
•
Check current restrictions imposed by power
source (maximum is 350 mA)
No data from the A325
•
(1) Check receiver power status
•
(1) No communication
•
(2) Verify it is locked to a valid DGPS signal
•
(2) No valid data
•
(2) Verify that it is locked to 4 or more GPS
satellites
•
(2) Check integrity and connectivity of power
and data cable connections
•
Verify the baud rate settings match
•
If trying to connect over Bluetooth, ensure
Bluetooth module is powered ON and device is
paired prior to opening the port
•
Verify the RCTM or the Bin messages are not
being accidentally output (send a $JSHOW
command)
•
Verify the baud rate settings match
•
Potentially, the volume of data requested to be
output could be higher than the current baud
rate supports. Try using a higher baud rate for
communications.
Random binary data from A325
No GPS lock
No SBAS
A325 GNSS Smart Antenna User Guide
•
Check integrity of antenna cable
•
Verify antenna’s view of the sky
•
Verify the lock status and signal to noise ratio of
GPS satellites (this can often be done on the
receiving device or by using PocketMax)
•
Check antenna cable integrity
•
Verify antenna’s view of the sky, especially
toward that SBAS satellites, south in the
northern hemisphere
•
Verify the bit error rate and lock status of SBAS
satellites (this can often be done on the
receiving device or by using SLXMon - monitor
BER value)
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PN 875-0318-000 Rev B1