Garmin GPS 25 LP Technical Specification

Garmin GPS 25 LP Technical Specification Manual pdf 24 page image

203) If either the target sentence mode field or the target sentence description field isnot valid, the PGRMO sentence will have no effect.4) $PGRMO,GPALM,1 will cause the sensor board to transmit all stored almanacinformation. All other NMEA sentence transmission will be temporarilysuspended.4.1.6 Tune DGPS Beacon Receiver (PSLIB)The $PSLIB sentence provides the ability to tune a GARMIN GBR-21 or equivalentbeacon receiver.$PSLIB,<1>,<2>*hh<1> Beacon tune frequency, 0.0, 283.5 – 325.0 kHz in 0.5 kHz steps<2> Beacon bit rate, 0, 25, 50, 100, or 200 bpsIf valid data is received, the GPS 25LP will store it in the EEPROM and echo the PSLIBcommand to the beacon receiver. At power up or external reset, any stored frequencyother than 0.0 causes the GPS 25LP to tune the beacon receiver.4.2 NMEA Transmitted SentencesThe subsequent paragraphs define the sentences which can be transmitted on TXD1by the GPS 25LP sensor boards.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 25LP isreferenced to the one-pulse-per-second output pulse immediately preceding theGPRMC sentence.The GPS 25LP will transmit each sentence (except where noted in particulartransmitted sentence descriptions) at a periodic rate based on the user selected baudrate and user selected output sentences. The sensor board will transmit the selectedsentences contiguously. The contiguous transmission starts at a GPS secondboundary. The length of the transmission can be determined by the following equationand tables:total characters to be transmittedlength of transmission = --------------------------------------------