Manual revision 017
Section 7: Troubleshooting
SBE 33
43
Problem 5: Yellow
NMEA Transmit
LED Not Flashing
Cause/Solution 1
:
Wiring may be incorrect. Check cables and connections between the SBE 33,
NMEA navigation device, and computer.
Cause/Solution 2
:
NMEA navigation device may be set to the wrong baud rate (SBE 33 requires
4800 or 9600 baud). Reset device’s baud rate.
Cause/Solution 3
:
NMEA navigation device may not be transmitting data. See the device manual
for setup details. To verify that it is sending data, connect an oscilloscope with
ground on NMEA B (T17) and the probe on NMEA A (T16). The signal
should be less than 0.5 volts between messages and have pulses greater than
4 volts for at least 0.2 milliseconds during the message.
Cause/Solution 4
:
SBE 33 may not be operating properly. To verify, use the NMEA simulation
program supplied with Seasoft. This program simulates a NMEA navigation
device transmitting a NMEA message (see
Appendix II: NMEA Message
Simulation Program
).
Problem 6: Yellow
NMEA Transmit
LED Flashing, but Lat/Lon Data Not Displaying
Cause/Solution 1
:
NMEA device may be transmitting a NMEA message that has an unexpected
format. See
Appendix I: NMEA Navigation Device Message and Data Formats
for a description of all the NMEA messages the SBE 33 can decode.
