Appendix D. GPS16-HVS Setups
As configured by Campbell Scientific, the GPS16-HVS will output the NMEA
0183 $GPGGA data string once a second, the PPS signal is enabled with a
duration of 80 milliseconds and the baud rate is set to 1200 baud.
Special software (SNRSRCFG.EXE) is available from Garmin International
for system setup. The GPS16-HVS user manual available from Garmin
International provides technical details beyond the scope of the Campbell
Scientific user manual.
Settings used by Campbell Scientific for GPS16-HVS setup:
GPS Base Model = GPS 16/17
Fix Mode = Automatic
Baud Rate = 1200
Dead Reckon Time = 30 sec
NMEA output time = 1 sec
Position pinning = off
NMEA 2.30 mode = off
Power Save Mode = off (Normal mode)
PPS mode = 1 Hz
PPS Length = 80 mS
Phaze output Data = off
DGPS Mode = WAAS only
Differential mode = Automatic
Earth Datum Index = NGS 84
Selected Sentences = GPGGA
Common changes would be baud rate and selected sentences. The CR1000,
CR3000, CR800, CR850, and CR23X dataloggers can support baud rates
above 1200, which can be beneficial in some applications. The NMEA 0183
GPVTG data sentence gives ground speed and direction, which may be
required for some applications. Changes can be made with the Garmin
software, or with a terminal emulator and the Garmin technical user manual.
Contact Garmin International (www.garmin.com) for either resource.
NMEA Commands for System Setup
Received NMEA strings are commands to the GPS16-HVS which change
some operating parameter. Null fields in the configuration sentence indicate no
change. All sentences are terminated with the carriage return and line feed
characters (CRLF). The CRLF can occur anywhere in the string. The *hh
indicates a checksum which is not required.
D-1
