Garmin GPS Receiver Garmin 18X GPS Receiver Module User Manual

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190-00879-08 GPS 18x Technical Specifications Rev. D
Page iii
TABLE OF CONTENTS
1 Introduction ..............................................................................................................................1
1.1 Cautions ........................................................................................................................................................... 1
1.2 Limited Warranty ............................................................................................................................................ 2
1.3 Overview ......................................................................................................................................................... 3
1.4 Features ........................................................................................................................................................... 3
1.5 GPS 18x Series ................................................................................................................................................ 4
1.5.1 GPS 18x USB.................................................................................................................................................... 4
1.5.2 GPS 18x PC ...................................................................................................................................................... 4
1.5.3 GPS 18x LVC, GPS 18x LVC-5m, and GPS 18x-5Hz ..................................................................................... 4
1.6 Technical Specifications .................................................................................................................................. 5
1.6.1 Physical Characteristics..................................................................................................................................... 5
1.6.1.1 Size .................................................................................................................................................... 5
1.6.1.2 Weight ............................................................................................................................................... 5
1.6.1.3 Color .................................................................................................................................................. 5
1.6.1.4 Case Material..................................................................................................................................... 5
1.6.1.5 Cable Length ..................................................................................................................................... 5
1.6.2 Electrical Characteristics ................................................................................................................................... 5
1.6.2.1 Input Voltage ..................................................................................................................................... 5
1.6.2.2 Input Current ..................................................................................................................................... 5
1.6.2.3 CMOS Serial Output Levels .............................................................................................................. 5
1.6.2.4 GPS Receiver Sensitivity .................................................................................................................. 5
1.6.2.5 Environmental Characteristics ........................................................................................................... 6
1.6.3 GPS Performance .............................................................................................................................................. 6
1.6.3.1 Receiver............................................................................................................................................. 6
1.6.3.2 Acquisition Times ............................................................................................................................. 6
1.6.3.3 Update Rate ....................................................................................................................................... 6
1.6.3.4 Accuracy ........................................................................................................................................... 6
1.6.4 Interfaces ........................................................................................................................................................... 6
1.6.4.1 GPS 18x Electrical Characteristics .................................................................................................... 6
1.6.4.2 Garmin Interface and Garmin USB Protocol ..................................................................................... 6
1.6.4.3 GPS 18x PC, GPS 18x LVC, & GPS 18x-5Hz Protocols .................................................................. 7
1.6.4.4 Measurement Pulse Output (GPS 18x LVC & GPS 18x-5Hz only) .................................................. 7
2 GPSx 18x LVC & GPS 18x -5Hz Wiring and Pinouts .........................................................8
2.1 GPS 18x LVC & GPS 18x -5Hz Pinout .......................................................................................................... 8
2.2 GPS 18x LVC & GPS 18x -5Hz Wiring Diagrams ......................................................................................... 8
3 Mechanical Characteristics & Mounting.............................................................................10
4 GPS 18x PC, GPS 18x LVC, & GPS 18x-5Hz Software Interface ....................................12
4.1 Received NMEA 0183 Sentences ................................................................................................................. 12
4.1.1 Almanac Information (ALM) .......................................................................................................................... 12
4.1.2 Sensor Initialization Information (PGRMI) .................................................................................................... 13
4.1.3 Sensor Configuration Information (PGRMC) ................................................................................................. 13
4.1.4 Additional Sensor Configuration Information (PGRMC1) ............................................................................. 14
4.1.5 Output Sentence Enable/Disable (PGRMO) ................................................................................................... 14
4.2 Transmitted NMEA 0183 Sentences ............................................................................................................. 15
4.2.1 Sentence Transmission Rate ............................................................................................................................ 15
4.2.2 Transmitted Time ............................................................................................................................................ 16
4.2.3 Global Positioning System Almanac Data (ALM) .......................................................................................... 16
4.2.4 Global Positioning System Fix Data (GGA) ................................................................................................... 17
4.2.5 GPS DOP and Active Satellites (GSA) ........................................................................................................... 17
4.2.6 GPS Satellites in View (GSV) ......................................................................................................................... 17
4.2.7 Recommended Minimum Specific GPS/TRANSIT Data (RMC) ................................................................... 18

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