Garmin GPS 16HVS Instruction Manual - Page 12

Garmin 16-HVS GPS Receiver 5. Troubleshooting Testing and evaluation of serial communications is best done by reducing the whole system to small manageable systems. Usually some portions of the whole system are working. The first steps involve finding what is working. During this process you may find parts of the system that are not working or mistakes that can be easily corrected. Fix each subsystem before testing others. 5.1 GPS Setup and Function Test the Garmin16-HVS for proper operation including the baud rate and output string. Use a computer, terminal emulator software, a serial port (RS232), and a 9-pin to 9-pin serial cable. The computer and serial port can be the same as used to communicate with the datalogger. Terminal emulation software is pretty common. Hyperterm is supplied as part of Windows ™ and works. Procomm ™ is another communication software package that works well. Set up the software for the correct serial port, 1200 baud, 8 data bits, 1 stop bit and no parity. Flow control should be off. Using the serial cable, connect the Garmin16-HVS to the computer serial port. Power up the Garmin16-HVS. The GPS antenna should have a clear view of the sky. Don't expect the GPS antenna to work indoors. The $GPGGA string should be displayed once a second. Make sure the $GPGGA string is showing a valid GPS fix. A valid GPS fix will display time, position and have a GPS quality number greater than zero. Part number 17218, RJ45 to DB9 adapter, is needed to connect the Garmin16-HVS to the computer serial cable. 8