Garmin GPS 16HVS Instruction Manual - Page 25

Appendix D. Garmin16-HVS Setups As configured by Campbell Scientific, the Garmin16-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 Garmin16-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 Garmin16-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 Garmin16-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