Garmin GPS 17HVS Technical Specifications - Page 19

4.1.6 Tune DGPS Beacon Receiver (PSLIB) The $PSLIB sentence provides the ability to tune a Garmin GBR 21, GBR 23 or equivalent beacon receiver. $PSLIB,,*hh Beacon tune frequency, 0.0, 283.5-325.0 kHz in 0.5 kHz steps Beacon bit rate, 0, 25, 50, 100, or 200 bps If valid data is received, the GPS sensor will store it in the EEPROM and echo the PSLIB command to the beacon receiver. If the GPS sensor is using any stored beacon frequency other than 0.0, it will tune the beacon receiver once immediately after power up or external reset. 4.2 Transmitted NMEA 0183 Sentences The subsequent paragraphs define the sentences that can be transmitted on COM 1 by the GPS sensor. 4.2.1 Sentence Transmission Rate Sentences are transmitted with respect to the user selected baud rate. The GPS sensor will transmit each sentence (except where noted in particular transmitted sentence descriptions) at a periodic rate based on the user selected baud rate and user selected output sentences. The GPS sensor will transmit the selected sentences contiguously. The length of the transmission can be determined by the following equation and Tables 2 and 3: total characters to be transmitted length of transmission characters transmitted per second Sentence GPRMC GPGGA GPGSA GPGSV PGRME Output by Default?      Maximum Characters 74 82 66 70 35 GPGLL 44 GPVTG 42 PGRMV 32 PGRMF 82 PGRMB  40 PGRMM  32 PGRMT Once per minute 50 Table 2: NMEA 0183 Output Sentence Order and Size Baud Characters per Second 300 30 600 60 1200 120 2400 240 4800 480 9600 960 19200 1920 38400 3840 Table 3: Characters per Second for Available Baud Rates The maximum number of fields allowed in a single sentence is 82 characters including delimiters. Values in the table include the sentence start delimiter character "$" and the termination delimiter . The factory set defaults will result in a once-per-second transmission at the NMEA 0183 specification transmission rate of 4800 baud. Regardless of the selected baud rate, the information transmitted by the GPS sensor is referenced to the one-pulseper-second output pulse immediately preceding the GPRMC sentence, or whichever sentence is output first in the burst (see Table 2 above). 190-00228-21 GPS 16/17 Technical Specifications Page 15 Rev. A