Garmin GPS 18 Technical Specifications

Also see for GPS 18 5Hz: Reference guide Features Setup guide

Contents

Garmin GPS 18 Technical Specifications Manual pdf 13 page image

GPS 18 Technical Specifications (190-00307-00) Rev. DPage 71.5.5 Interfaces1.5.5.1 GPS 18 Electrical Characteristics• GPS 18 USB: USB 2.0 full-speed protocol compatible, as well as USB 1.1 full-speed protocol.• GPS 18 PC and LVC: TIA-232-F (RS-232) compatible asynchronous receiver. Default setting is 4800baud.• GPS 18-5Hz: TIA-232-F (RS-232) compatible asynchronous receiver. Default setting is 19200baud.1.5.5.2 Garmin Interface and Garmin USB ProtocolRefer to the Garmin Device Interface Specification for information about the Garmin USB Protocol. Thedocument is located on the Garmin Web site at: http://www.garmin.com/support/commProtocol.html. Seealso Appendix B: Binary Phase Output Format for additional information concerning access to raw pseudo-range and carrier phase data from the GPS 18 USB.Refer to the Garmin Device Interface Specification for details on the Garmin interface. At the time of thisprinting, these specs are available from the technical suppport section of our Web site:http://www.garmin.com/support/commProtocol.html.1.5.5.3 GPS 18 PC, GPS 18 LVC, & GPS 18-5Hz Protocols• NMEA 0183 Version 2.0 or NMEA 0183 Version 2.30 (Version 2.0 is factory default, programmableby data field 7 of the PGRMC1 sentence described in Section 4.1.4 Additional Sensor ConfigurationInformation (PGRMC1).• Available NMEA 0183 output sentences include GPALM, GPGGA, GPGSA, GPGSV, GPRMC,GPVTG, GPGLL, PGRME, PGRMF, PGRMT, PGRMV, and PGRMB (Garmin proprietarysentences). See Section 4.2 Transmitted NMEA 0183 Sentences for format descriptions.• Configuration and initialization is accomplished with NMEA 0183 input sentences. Allowsinitialization of information such as expected position, date, time, earth datum, and differential mode.See Section 4.1 Received NMEA 0183 Sentences for format descriptions.• Configurable for binary data output including GPS carrier phase data.1.5.5.4 Measurement Pulse Output (GPS 18 LVC & GPS 18-5Hz only)• GPS 18 LVC: 1 Hz pulse with programmable width, configurable in 20 ms increments form 20 ms to980 ms. See Section 4.1.3 Sensor Configuration Information (PGRMC) for details about configuringthe Measurement Pulse Output (or PPS) feature.• GPS 18-5Hz: 5 Hz pulse synchronized with the time of fix. One of the five pulses will align with theUTC second boundary. The pulse width is programmable from 20 ms to 180 ms. The PGRMCsentence will indicate which pulse is at the top-of-the-second. See Section 4.1.3 Sensor ConfigurationInformation (PGRMC) for details about configuring the Measurement Pulse Output (or PPS) feature.• 1 μs accuracy for all conditions in which the GPS 18 LVC or GPS 18-5Hz has reported a valid andaccurate position fix for at least the previous 4 seconds.