MBX-4 User Guide
75
Low SNR Check integrity of antenna connections
Check MBA-3 antenna ground
Select alternate antenna position
Non-differential GPS output Verify MBX-4 lock status
Verify matched MBX-4 output and GPS RTCM input baud
rates
Verify GPS receiver RTCM compatibility
Verify GPS receiver DGPS configuration
Verify pin connectivity between MBX-4 and GPS receiver
Verify communication parameter settings (8 data bits - No
parity - 1 stop bit)
Verify communication levels of MBX-4 and GPS receiver are
matched ((RS-232C vs RS-422)
Verify data cable connections
No MBX-4 response to
NMEA commands and
queries
Verify baud rate settings of MBX-4 and terminal device
(MBX-4 default baud rate = 4800 bd)
Verify communication parameter settings (8 data bits - No
parity - 1 stop bit)
Check integrity of data cable connections
Verify pin connectivity between MBX-4 and terminal device
Ensure receiver is in MBX-4 mode
Table 5-1: MBX-4 Troubleshooting
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