Hemisphere GPS A222, Руководство пользователя

Страница: 20 / 29

A222 User Guide Appendix A- Troubleshooting Page 16 of 20
Appendix A: Troubleshooting
Table A-1 provides a list of issues with possible solutions to help you troubleshoot anomalous A222 operation.
Table A-1: Troubleshooting
Issue Possible Solution
Receiver fails to power

Verify polarity of power leads

Check integrity of power cable connections

Check power input voltage (8 - 32 VDC)

Check current restrictions imposed by power source (maximum is 300
mA at 12 VDC)
 No data from the A222

No communication

No valid data
 Check receiver power status

Check integrity and connectivity of power and data cable connections

Verify the baud rate settings match

Verify receiver responds to valid $J Command ($JI)

Verify it is locked to a valid DGNSS signal

Verify it is locked to 4 or more GNSS satellites
Random binary data from
A222

Verify the RTCM or the BIN messages are not being accidentally output

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 either using a higher baud rate for
communications or decreasing the number of messages and/or baud rates
No GNSS lock

Check the integrity of the antenna’s power/data cable

Verify the antenna is outdoors with a clear a view of the sky

Verify the lock status and signal-to-noise ratio (SNR) of GNSS satellites
No GNSS position

Verify the antenna is outdoors with a clear view of the sky
A222 LED not blinking after
connection to power

Verify polarity of power leads

Check integrity of power cable connections

Check power input voltage (8 - 32 VDC)
A222 LED displays solid color
(not blinking)

Power-cycle the receiver

Contact Technical Support