Garmin GPS 16-HVS Manuale di istruzioni - Pagina 12

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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.

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.