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Old 02-08-2021, 09:51 AM
12vaitor 12vaitor is offline
Join Date: Aug 2012
Location: Panama City, FL
Posts: 174

You did not mention if you were seeing any activity on the port monitor TX and RX counters for serial port 4.

You may want to check your GTR225 Serial Port IO MODE on the System Configuration menu, it should be set to NMEA (the default setting is 'NONE').

If you have a PC/Laptop with a RS232 serial port you can use a HyperTeminal program to see if the GTR225 is sending the data to pin 9 of the SV D37 connector. The GTR is set for 9600, 8, 1, None and you should be able to see the NMEA 0183 string on pin 9 if the wiring is correct.

John Salak
RV12 N896HS
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