Garmin GPS 15L Technical Specifications

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Garmin GPS 15L Technical Specifications Manual pdf 19 page image

190-00266-01 GPS 15H & 15L Technical Specifications Rev. DPage 154.2 TRANSMITTED NMEA 0183 SENTENCESThe subsequent paragraphs define the sentences that can be transmitted on COM 1 by the GPS sensor.4.2.1 Sentence Transmission RateSentences are transmitted with respect to the user-selected baud rate.Regardless of the selected baud rate, the information transmitted by the GPS sensor is referenced to theone-pulse-per-second output pulse immediately preceding the GPRMC sentence, or whichever sentence isoutput first in the burst (see Table 3 below).The GPS sensor transmits each sentence (except where noted in particular transmitted sentencedescriptions) at a periodic rate based on the user-selected baud rate and user-selected output sentences. TheGPS sensor transmits the selected sentences contiguously. The contiguous transmission starts at a GPSsecond boundary. Determine the length of the transmission with the following equation and Tables 3 and 4:total characters to be transmittedlength of transmission = ---------------------------------------------characters transmitted per secondSentence Output by Default? Maximum CharactersGPRMC 74GPGGA 82GPGSA 66GPGSV 70PGRME 35GPGLL 44GPVTG 42PGRMV 32PGRMF 82PGRMB 40PGRMM 32PGRMT Once per minute 50Table 3: NMEA 0183 Output Sentence Order and SizeBaud Characters per Second300 30600 601200 1202400 2404800 4809600 96019200 192038400 3840Table 4: Characters per Second for Available Baud RatesThe maximum number of fields allowed in a single sentence is 82 characters including delimiters. Valuesin the table include the sentence start delimiter character “$” and the termination delimiter . Thefactory set defaults result in a once per second transmission at the NMEA 0183 specification transmissionrate of 4800 baud.