Garmin GPS 18 5Hz Technical Specifications Download Page 1

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GPS 18 Technical Specifications (190-00307-00)

Rev. D



Garmin International, Inc.

1200 E. 151

Street

Olathe, KS 66062 USA

190-00307-00, Revision D

June 2005

GPS 18
TECHNICAL
SPECIFICATIONS

Summary of Contents for GPS 18 5Hz

Page 1: ...GPS 18 Technical Specifications 190 00307 00 Rev D Garmin International Inc 1200 E 151st Street Olathe KS 66062 USA 190 00307 00 Revision D June 2005 GPS 18 TECHNICAL SPECIFICATIONS ...

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Page 3: ...commercial distribution of this manual or any revision hereto is strictly prohibited Information in this document is subject to change without notice Garmin reserves the right to change or improve its products and to make changes in the content without obligation to notify any person or organization of such changes or improvements Garmin International Inc 1200 East 151st Street Olathe Kansas 66062...

Page 4: ...rmin USB Protocol 7 1 5 5 3 GPS 18 PC GPS 18 LVC GPS 18 5Hz Protocols 7 1 5 5 4 Measurement Pulse Output GPS 18 LVC GPS 18 5Hz only 7 2 GPS 18 LVC GPS 18 5Hz Wiring and Pinouts 8 2 1 GPS 18 LVC GPS 18 5Hz Pinout 8 2 2 GPS 18 LVC GPS 18 5Hz Wiring Diagrams 8 3 Mechanical Characteristics Mounting 10 4 GPS 18 PC GPS 18 LVC GPS 18 5Hz Software Interface 12 4 1 Received NMEA 0183 Sentences 12 4 1 1 Alm...

Page 5: ...8 PC LVC 18 5Hz Windows Serial Mouse Issue 30 Appendix E Sensor Configuration Software 32 Downloading the Sensor Configuration Software 32 Selecting a Model 32 Connecting to the Sensor 32 File Menu 33 Comm Menu 33 Config Menu 33 View Menu 34 Help Menu 34 LIST OF TABLES AND FIGURES Table 1 GPS 18 LVC GPS 18 5Hz Wire Pinout 8 Figure 1 Computer Serial Port Interconnection 8 Figure 2 PDA Serial Port I...

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Page 7: ...s Operation of this device is subject to the following conditions 1 This device may not cause harmful interference and 2 this device must accept any interference received including interference that may cause undesired operation This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instructions may cause harmful interference to ra...

Page 8: ...ENTIAL DAMAGES WHETHER RESULTING FROM THE USE MISUSE OR INABILITY TO USE THIS PRODUCT OR FROM DEFECTS IN THE PRODUCT Some states do not allow the exclusion of incidental or consequential damages so the above limitations may not apply to you Garmin retains the exclusive right to repair or replace the unit or software or offer a full refund of the purchase price at its sole discretion SUCH REMEDY SH...

Page 9: ...ear view of the GPS satellites Internal FLASH memory allows the GPS to retain critical data such as satellite orbital parameters last known position date and time End user interfaces such as keyboards and displays are the responsibility of the application designer 1 3 FEATURES 12 channel GPS receiver tracks and uses up to 12 satellites for fast accurate positioning and low power consumption Differ...

Page 10: ...l connector on the GPS 18 as a serial mouse Please refer to Appendix D GPS 18 PC LVC 18 5Hz Windows Serial Mouse Issue for complete details 1 4 3 GPS 18 LVC GPS 18 LVC 5m and GPS 18 5Hz These products interface to a serial port The units accept TIA 232 F RS 232 level inputs and transmit voltage levels that swing from ground to the positive supply voltage TIA 232 F RS 232 polarity They also have re...

Page 11: ...PX7 level immersion in 1 meter of water for 30 minutes 1 5 1 5 Cable Length GPS 18 USB 2 meter GPS 18 PC 2 meter GPS 18 LVC 3 meter Garmin Part Number 010 00321 05 GPS 18 LVC 5m 5 meter Garmin Part Number 010 00321 06 GPS 18 5Hz 5 meter 1 5 2 Electrical Characteristics 1 5 2 1 Input Voltage GPS 18 USB 4 4 5 5 V GPS 18 PC 8 30 V Automotive supply from cigarette lighter jack GPS 18 LVC 4 0 5 5 V GPS...

Page 12: ... 2 seconds Warm Approx 15 seconds all data known Cold Approx 45 seconds initial position time and almanac known ephemeris unknown AutoLocateTM 5 minutes almanac known initial position and time unknown SkySearch 5 minutes no data known 1 5 4 3 Update Rate GPS 18 USB PC and LVC 1 record per second GPS 18 5Hz 5 records per second 1 5 4 4 Accuracy GPS Standard Positioning Service SPS Position 15 meter...

Page 13: ...tion 4 1 4 Additional Sensor Configuration Information PGRMC1 Available NMEA 0183 output sentences include GPALM GPGGA GPGSA GPGSV GPRMC GPVTG GPGLL PGRME PGRMF PGRMT PGRMV and PGRMB Garmin proprietary sentences See Section 4 2 Transmitted NMEA 0183 Sentences for format descriptions Configuration and initialization is accomplished with NMEA 0183 input sentences Allows initialization of information...

Page 14: ...are terminated with a six wire connector that is used by Garmin for testing purposes You can remove this connector without voiding your warranty see Section 1 2 Limited Warranty 2 1 GPS 18 LVC GPS 18 5Hz PINOUT GPS 18 Pin Color Signal Name Wire Gauge 1 Yellow Measurement Pulse Output 28 2 Red Vin 26 3 Black Ground 28 4 White Transmit Data 28 5 Black Ground 26 6 Green Receive Data 28 Table 1 GPS 18...

Page 15: ...GPS 18 Technical Specifications 190 00307 00 Rev D Page 9 Figure 2 PDA Serial Port Interconnection Figure 3 Basic NMEA Device Interconnection ...

Page 16: ...unt formed from steel sheet metal that is 1 15 mm thick Figure 7 shows similar mounting geometry for mount formed from aluminum sheet metal that is 1 25 mm thick Use caution when tightening the mounting bolt Tightening the mounting bolt can cause the mount to pull tight directly against the metal insert not against the plastic housing which would tend to pull the insert out of the plastic Figure 6...

Page 17: ...S 18 Technical Specifications 190 00307 00 Rev D Page 11 Figure 5 GPS 18 Suction Cup Mount Center Hole Dimensions Figure 6 GPS 18 Flush Mount Dimensions Figure 7 GPS 18 Flush Mount Center Hole Dimensions ...

Page 18: ...and received by the GPS 18 PC LVC and GPS 18 5Hz products 4 1 RECEIVED NMEA 0183 SENTENCES The following paragraphs define the sentences that can be received on the GPS sensors port Null fields in the configuration sentence indicate no change in the particular configuration parameter All sentences received by the GPS sensor must be terminated with CR LF the ASCII characters for carriage return 0D ...

Page 19: ...RMC 1 2 3 4 5 6 7 8 9 10 11 12 13 14 hh CR LF 1 Fix mode A automatic 2 2D exclusively host system must supply altitude 3 3D exclusively 2 Altitude above below mean sea level 1500 0 to 18000 0 meters 3 Earth datum index If the user datum index 96 is specified fields 4 through 8 must contain valid values Otherwise fields 4 through 8 must be null Refer to Appendix A Earth Datum List for a list of ear...

Page 20: ...ary to send the following eight byte data stream to temporarily change the data format to NMEA 0183 Then follow by sending a PGRMC1 sentence that turns off the Binary Phase Output Data format 10 0A 02 26 00 CE 10 03 Hexadecimal 4 1 5 Output Sentence Enable Disable PGRMO The PGRMO sentence provides the ability to enable and disable specific output sentences The following sentences are enabled at th...

Page 21: ... only 40 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 ...

Page 22: ...ransmitted this information for the leap second added December 31 1998 as follows GPRMC 235959 A 3851 3651 N 09447 9382 W 000 0 221 9 071103 003 3 E 69 GPRMC 000000 A 3851 3651 N 09447 9382 W 000 0 221 9 081103 003 3 E 67 GPRMC 000000 A 3851 3651 N 09447 9382 W 000 0 221 9 081103 003 3 E 67 GPRMC 000001 A 3851 3651 N 09447 9382 W 000 0 221 9 081103 003 3 E 66 If a negative leap second should be re...

Page 23: ...d Active Satellites GSA GPGSA 1 2 3 3 3 3 3 3 3 3 3 3 3 3 4 5 6 hh CR LF 1 Mode M manual A automatic 2 Fix type 1 not available 2 2D 3 3D 3 PRN number 01 to 32 of satellite used in solution up to 12 transmitted leading zeros will be transmitted 4 Position dilution of precision 0 5 to 99 9 5 Horizontal dilution of precision 0 5 to 99 9 6 Vertical dilution of precision 0 5 to 99 9 4 2 6 GPS Satellit...

Page 24: ...2 8 Track Made Good and Ground Speed VTG GPVTG 1 T 2 M 3 N 4 K 5 hh CR LF 1 True course over ground GPS 18 PC and LVC 000 to 359 degrees GPS 18 5Hz 000 0 to 359 0 degrees leading zeros will be transmitted 2 Magnetic course over ground 000 to 359 degrees GPS 18 5Hz 000 0 to 359 0 degrees leading zeros will be transmitted 3 Speed over ground GPS 18 PC and LVC 000 0 to 999 9 knots GPS 18 5Hz 000 00 t...

Page 25: ...to 359 degrees true 14 Position dilution of precision 0 to 9 rounded to nearest integer value 15 Time dilution of precision 0 to 9 rounded to nearest integer value 4 2 12 Sensor Status Information PGRMT The Garmin Proprietary sentence PGRMT gives information concerning the status of the GPS sensor This sentence is transmitted once per minute regardless of the selected baud rate PGRMT 1 2 3 4 5 6 7...

Page 26: ...nsmitted by the GPS 18 series products is referenced to the pulse immediately preceding the NMEA 0183 RMC sentence The accuracy of the one pulse per second output is maintained only while the GPS receiver is computing a valid position fix To obtain the most accurate results the one pulse per second output should be calibrated against a local time reference to compensate for cable and internal rece...

Page 27: ...ASTRO DOS 71 4 St Helena Island 11 ASTRONOMIC STATION 1952 Marcus Island 12 ASTRO B4 SOROL ATOLL Tern Island 13 BELLEVUE IGN Efate and Erromango Islands 14 BERMUDA 1957 Bermuda Islands 15 BOGOTA OBSERVATORY Colombia 16 CAMPO INCHAUSPE Argentina 17 CANTON ASTRO 1966 Phoenix Islands 18 CAPE CANAVERAL Florida Bahama Islands 19 CAPE South Africa 20 CARTHAGE Tunisia 21 CHATHAM 1971 Chatham Island New Z...

Page 28: ...NNA Nigeria 55 NORTH AMERICAN 1927 Alaska 56 NORTH AMERICAN 1927 Bahamas excluding San Salvador Island 57 NORTH AMERICAN 1927 Central America Belize Costa Rica El Salvador Guatemala Honduras Nicaragua 58 NORTH AMERICAN 1927 Canal Zone 59 NORTH AMERICAN 1927 Canada including Newfoundland Island 60 NORTH AMERICAN 1927 Caribbean Barbados Caicos Islands Cuba Dominican Republic Grand Cayman Jamaica Lee...

Page 29: ...SOUTH CHILEAN 1963 South Chile 87 SANTO DOS Espirito Santo Island 88 SAO BRAZ Sao Miguel Santa Maria Islands Azores 89 SAPPER HILL 1943 East Falkland Island 90 SCHWARZECK Namibia 91 SOUTHEAST BASE Porto Santo and Madeira Islands 92 SOUTHWEST BASE Faial Graciosa Pico Sao Jorge and Terceira Islands Azores 93 TIMBALAI 1948 Brunei and East Malaysia Sarawak and Sabah 94 TOKYO Japan Korea Okinawa 95 TRI...

Page 30: ...rom the technical suppport section of our Web site http www garmin com support commProtocol html The ID of each command should be 10 decimal to signify that the record is a command The data portion of the packet should be one of the following Function Command base 10 Position Record On 49 Position Record Off 50 Receiver Measurement Record On 110 Receiver Measurement Record Off 111 Note that the sa...

Page 31: ...scribed below Bit Meaning when bit is one 1 0 The unit has ephemeris data for the specified satellite 1 The unit has a differential correction for the specified satellite 2 The unit is using this satellite in the solution This pattern is repeated for all 12 channels for a total of 12 X 7 bytes 84 0x54 bytes typedef struct cpo_sat_data cpo_sat_data cpo_sat_data cpo_sat_data cpo_sat_data cpo_sat_dat...

Page 32: ... float alt_vel float msl_hght int leap_sec long grmn_days cpo_pvt_data alt Ellipsoid altitude meters epe Est pos error meters eph Pos err horizontal meters epv Pos err vertical meters fix 0 no fix 1 no fix 2 2D 3 3D 4 2D differential 5 3D differential 6 and greater not defined gps_tow GPS time of week sec lat Latitude radians lon Longitude radians lon_vel Longitude velocity meters second lat_vel L...

Page 33: ...rcv_sv_data sv 12 cpo_rcv_data rcvr_tow Receiver time of week seconds rcvr_wn Receiver week number cycles Number of accumulated cycles pr Pseudorange meters phase To convert to 0 to 359 999 multiply by 360 0 and divide by 2048 0 slp_dtct 0 no cycle slip detected non zero cycle slip detected snr_dbhz Signal strength db Hz svid Satellite number 0 to 31 119 to 138 for WAAS Note add 1 to offset to cur...

Page 34: ...nitialize static variables static char in_que 256 static int in_que_ptr 0 static rx_state_type rx_state DAT void add_to_que char data define DLE_BYTE 0x10 define ETX_BYTE 0x03 if rx_state DAT if data DLE_BYTE rx_state DLE else in_que in_que_ptr data else if rx_state DLE if data ETX_BYTE rx_state ETX else rx_state DAT in_que in_que_ptr data else if rx_state ETX if data DLE_BYTE rx_state DLE if in_q...

Page 35: ...le 38361 decimal 5 Determine the actual baud rate value from the data sent in step 4 This value will be within 5 of the actual baud rate For example the GPS unit might send a baud rate of 38361 which correlates to a baud rate of 38400 6 If the baud rate in step 5 is acceptable transmit packet id IOP_ACK_BYTE 0x06 data IOP_BAUD_ACPT_DATA 0x31 7 Sleep for a small amount of time about 100 millisecond...

Page 36: ...op up window and click on the Device Manager button 4 Right click on Serial BallPoint Mouse and choose the option to Disable NOT uninstall this device Solution 2 Do not plug the DB9 connector into the computer until the computer is turned on and the operating system is completely booted up and running Every time you use the GPS 18 PC LVC you will need to start the computer and operating system bef...

Page 37: ...tion 8 Place a check mark in the box next to Binary Output Data to change the GPS 18 to Garmin Mode The unit will keep this change in the programming until you change it again in the software Note Selecting Config Switch to Garmin Mode or pressing the F11 key only changes the unit to work in Garmin Mode until power is cycled through the unit again For a more permanent change refer to step 8 above ...

Page 38: ...figuration Software SNSRCFG exe is included in the software update download Selecting a Model After opening the program snsrcfg exe the following screen appears Select the radio button next to the type of Garmin sensor you are configuring Connecting to the Sensor After selecting the type of sensor the following window opens This is the Main Interface Screen for the program To configure your sensor...

Page 39: ...sor Config Menu The Config Configuration Menu allows you configure the sensor as it is connected Sensor Configuration F6 Opens the Sensor Configuration Window shown to the right Many of the fields in this window should be left alone Please refer to the beginning of this manual for clarification about some of these fields For the most part this window is used to enter a new Latitude Longitude and A...

Page 40: ...ce Window Send Configuration To GPS F9 Sends the changes you have made to the programming to the sensor Switch to NMEA Mode F10 Switches the unit to NMEA Mode The sensor must be in NMEA Mode when connected to this software Switch to Garmin Mode F11 Switches the unit to Garmin Mode Update Software F12 After you have downloaded a new software version for the sensor you can update the sensor with the...

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