Garmin GPS 20x Technical Specifications

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Garmin GPS 20x Technical Specifications Manual pdf 10 page image

190-00880-00 GPS 20x Technical Specifications Rev. APage 73 GPS 20x SOFTWARE INTERFACEThe GPS 20x transmits using the Garmin USB interface. The Garmin USB interface is discussed in the GarminDevice Interface Specification found in the Garmin Device Interface SDK located on the Garmin Web site at:www.garmin.com/support/commProtocol.html.You can configure the GPS 20x to transmit binary data information over the USB interface. Refer to Appendix B:Garmin Binary Output Format.3.1 TRANSMITTED NMEA 0183 SENTENCESThe following paragraphs define the sentences that can be transmitted by the GPS 20x using Spanner (an applicationthat can provide NMEA output via a virtual COM port). Spanner is available for free on the Garmin web site. Todownload the software, start at www.garmin.com/oem, select the GPS 20x, and then select Updates & Downloads.3.1.1 Sentence Transmission RateSentences are transmitted with respect to the user selected baud rate.The GPS sensor will transmit each sentence once per second. The sentences are not configurable.Sentence Maximum CharactersGPRMC 74GPGGA 82GPGSA 66GPGSV 70PGRMT 50Table 1: NMEA 0183 Output Sentence Order and SizeThe maximum number of fields allowed in a single sentence is 82 characters including delimiters. Values in thetable include the sentence start delimiter character “$” and the termination delimiter .