GLOBALSAT GPS Engine Board
Contents
1. VA GLOBALSAT GPS Engine Board Hardware Data Sheet Product No EB 5318RF GlobalSat Wired by Wireless Version 0 1 Globalsat Technology Corporation 16F No 186 Jian Yi Road Chung Ho City Taipei Hsien 235 Taiwan Tel 886 2 8226 3799 Fax 886 2 8226 3899 E mail service globalsat com tw Website www globalsat com tw Issue Date 2011 10 4 APPR Ray CHECK PREPARE Luwalk 2012 8 31 Product Description Product Description EB 5318RF GPS module features high sensitivity low power and ultra small form factor This GPS module is powered by SiRF Star IV it can provide you with superior sensitivity and performance even in urban canyon and dense foliage environment With SIRF CGEE Client Generated Extended Ephemeris technology it predicts satellite positions for up to 3 days and delivers CGEE start time of less than 15 seconds under most conditions without any network assistance Besides MicroPower Mode allows GPS module to stay in a hot start condition nearly continuously while consuming very little power EB 5318RF is suitable for the following applications Automotive navigation Personal positioning Fleet management Mobile phone navigation Marine navigation Product Features SIRF Star IV high performance GPS Chipset Very high sensitivity Tracking Sensitivity 163 dBm Extremely fast TTFF Time To First Fix at low signal level Support UART I2C interface Default U2. 5 C Heating time 10 1 sec Peak temperature must not exceed 240 C and the duration of over 200 C should be 30 10 Seconds 2012 8 31 23 Appendix LABEL Artwork A Brand GLOBALSAT i eae Model EB 5318RF a GI b IS UART 12C I F m O a at E Included EEPROM EB 5631 RE SIRF IV 07CCD51 C CHIP Type SiRF IV D Bar code E Serial Number Product NO HEX Place of origin T Taiwan C China Product Month 123456789XYZ X gt Oct Y gt Nov Z gt Dec Product Year 2012 8 31 24
3. 71 GPGSV 2 2 07 09 23 313 42 04 19 159 41 15 12 041 42 41 Table B 8 GSV Data Format Name Example Units Description Message ID GPGSV GSV protocol header Number of Messages 2 Range 1 to 3 Message Number 1 Range 1 to 3 Satellites in View 07 Satellite ID 07 Channel 1 Range 1 to 32 Elevation 79 degrees Channel 1 Maximum90 Azimuth 048 degrees Channel 1 True Range 0 to 359 SNR C No 42 dBHz Range 0 to 99 null when not tracking Satellite ID 27 Channel 4 Range 1 to 32 Elevation 27 Degrees Channel 4 Maximum90 Azimuth 138 Degrees Channel 4 True Range 0 to 359 SNR C No 42 dBHz Range 0 to 99 null when not tracking Checksum 71 lt CR gt lt LF gt End of message termination 1 Depending on the number of satellites tracked multiple messages of GSV data may be required In some software versions the maximum number of satellites reported as visible is limited to 12 even though more may be visible 2012 8 31 13 RMC Recommended Minimum Specific GNSS Data Note Fields marked in italic red apply only to NMEA version 2 3 and later in this NMEA message description Table B 9 contains the values for the following example GPRMC 161229 487 A 3723 2475 N 12158 3416 W 0 13 309 62 120598 A 10 Table B 9 RMC Data Format Name Example Units Description Message ID GPRMC RMC protocol header UTC
4. EB 365 pin to pin compactable please ON_OFF connect to WAKE_UP If don t use this just NC DRI2C interface The I2C interface supports required sensor instruments such as gyros accelerometers compasses or other sensors that can operate with an 12C bus If don t use this just NC VBAT This is the battery backup power input for the SRAM and RTC when main power is removed VBAT is 2V 3 5V 2012 8 31 7 OPERATING Description RF_IN This pin receives signal of GPS analog via external active antenna It has to be a controlled impedance trace at 50ohm Do not have RF traces closed the other signal path and routing it on the top layer Keep the RF traces as short as possible GND This is Ground pin for the baseband circuit VBAT This is the battery backup power input for the SRAM and RTC when main power is off Without the external backup battery EB 365 will always execute a cold star after turning on To achieve the faster start up offered by a hot or warm start a battery backup must be connected The battery voltage should be between 2 0V and 3 5V NC EB 5318RF reserves pin Just NC VCC This is the main power supply to the engine board 3 1Vdc to 3 5Vdc RESET Low Active when EB 5318RF is accepted this single EB 5318RF going to Hibernate mode If want EB 5318RF up need input ON_OFF single TIMEPULSE This pin provides one pulse per second output from the board which is synchronized to GPS t
5. GSP1 95000 for GSP1 LX will be used INT32 lt TimeOfWeek gt GPS Time Of Week UINT32 lt WeekNo gt GPS Week Number UINT16 lt ChannelCount gt Number of channels to use 1 12 UBYTE lt ResetCfg gt bit mask 0x01 Data Valid warm hot starts 1 0x02 clear ephemeris warm start 1 0x04 clear memory Cold start 1 UBYTE Example Start using known position and time PSRF104 37 3875111 121 97232 0 96000 237759 922 12 3 37 F Development Data On Off ID 105 Switch Development Data Messages On Off Use this command to enable development debug information if you are having trouble getting commands accepted Invalid commands will generate debug information that should enable the user to determine the source of the command rejection Common reasons for input command rejection are invalid checksum or parameter out of specified range This setting is not preserved across a module reset 2012 8 31 20 Format PSRF105 lt debug gt CKSUM lt CR gt lt LF gt lt debug gt 0 Off 1 On Example Debug On PSRF105 1 3E Example Debug Off PSRF105 0 3F G Select Datum ID 106 Selection of datum to be used for coordinate Transformations GPS receivers perform initial position and velocity calculations using an earth centered earth fixed ECEF coordinate system Results may be converted to an earth model geoid defined by the selected datum The default datum is WGS 84 World Geodetic System 1984 which provides a worldwide comm
6. Time 161229 487 hhmmss sss Status A A data valid or V data not valid Latitude 3723 2475 ddmm mmmm N S Indicator N N north or S south Longitude 12158 3416 dddmm mmmm E W Indicator W E east or W west Speed Over Ground 0 13 knots Course Over Ground 309 62 degrees True Date 120598 ddmmyy Magnetic Variation degrees E east or W west East West Indicator E E east Mode A A Autonomous D DGPS E DR N Output Data Not Valid R Coarse Position S Simulator Checksum 10 lt CR gt lt LF gt End of message termination 1 A valid status is derived from all the parameters set in the software This includes the minimum number of satellites required any DOP mask setting presence of DGPS corrections etc If the default or current software setting requires that a factor is met then if that factor is not met the solution will be marked as invalid 2 SiRF Technology Inc does not support magnetic declination All course over ground data are geodetic WGS84 directions relative to true North 3 Position was calculated based on one or more of the SVs having their states derived from almanac parameters as opposed to ephemerides 2012 8 31 14 VTG Course Over Ground and Ground Speed Note Fields marked in italic red apply only to NMEA version 2 3 and later in this NMEA message description Table B 10 contains the values for the following example GPVTG 309 62 T M 0 13 N 0 2 K A 23 Table B 10 VTG Data
7. UTC seconds from 00 to 59 Either using valid IONO UTC or estimated from default UTC Time 181813 hhmmss leap seconds Day 14 Day of the month range 1 to 31 Month 10 Month of the year range 1 to 12 Year 2003 Year Local zone hour hour Offset from UTC set to 00 Local zone minutes minute Offset from UTC set to 00 Checksum 4F lt CR gt lt LF gt End of message termination 1 Not supported by CSR reported as 00 2012 8 31 16 NMEA Input Command A Set Serial Port ID 100 Set PORTA parameters and protocol This command message is used to set the protocol SIRF Binary NMEA or USER1 and or the communication parameters baud data bits stop bits parity Generally this command would be used to switch the module back to SiRF Binary protocol mode where a more extensive command message set is available For example to change navigation parameters When a valid message is received the parameters will be stored in battery backed SRAM and then the receiver will restart using the saved parameters Format PSRF100 lt protocol gt lt baud gt lt DataBits gt lt StopBits gt lt Parity gt CKSUM lt CR gt lt LF gt lt protocol gt O SIRF Binary 1 NMEA 4 USER1 lt baud gt 1200 2400 4800 9600 19200 38400 lt DataBits gt 8 7 Note that SIRF protocol is only valid f8 Data bits lt StopBits gt 0 1 lt Parity gt 0 None 1 Odd 2 Even Example 1 Switch to SIRF Binary protocol at 960
8. 0 8 N 1 PSRF100 0 9600 8 1 0 0C lt CR gt lt LF gt Example 2 Switch to User1 protocol at 38400 8 N 1 PSRF100 4 38400 8 1 0 38 lt CR gt lt LF gt Checksum Field The absolute value calculated by exclusive OR the 8 data bits of each character in the Sentence between but excluding and The hexadecimal value of the most significant and least significant 4 bits of the result are convertted to two ASCII characters 0 9 A F for transmission The most significant character is transmitted first lt CR gt lt LF gt Hex OD OA B Navigation Initialization ID 101 Parameters required for start This command is used to initialize the module for a warm start by providing current position in X Y Z coordinates clock offset and time This enables the receiver to search for the correct satellite signals at the correct signal parameters Correct initialization parameters will enable the receiver to acquire signals more quickly and thus produce a faster navigational solution When a valid Navigation Initialization command is received the receiver will restart using the input parameters as a basis for satellite selection and acquisition Format PSRF101 lt X gt lt Y gt lt Z gt lt ClkOffset gt lt TimeOfWeek gt lt WeekNo gt lt chniCount gt lt ResetCfg gt CK 2012 8 31 17 SUM lt CR gt lt LF gt lt X gt X coordinate position INT32 lt Y gt Y coordinate position IN
9. 1 3 Physical Characteristic O WO C00002 OON pene N x otoNoee LL mie 14 00 ET A jaso OONNOOOOOM OMOONOWMs stm TK NOSOMOOKN b samc ees a Type 19 pin stamp holes Dimensions 15 2mm 14 mm 2 4mm 2012 8 31 6 Application Application Circuit Antenna Y RF WAKE_UP ON_OFF TIMEPULSE DR_I2C_CLK K DR_I2C_DI0 LAANA BIMI AG121 SNTE RXA LINAN TX BIMISAG191 SNID gt TXA BOOTSEL GND GPS Active Antenna Specifications Recommendation Frequency 1575 42 2MHz Amplifier Gain 18 22dB Typical Axial Ratio 3 dB Typical Output VSWR 2 0 Max Output Impedance 500 Noise Figure 2 0 dB Max Polarization RHCP Antenna Input Voltage 3 3V Typ NOTE di RESET Low Active when EB 5318RF is accepted this single EB 5318RF going to Hibernate mode If want EB 5318RF up need input ON_OFF single TIMEMARK One pulse per second output When EB 5318RF is 3D Fixed this pin will output 1uS Hi level pulse If don t use this just NC ECLK ECLK clock input for frequency aiding applications or as a test clock If don t use this just NC GPIO User can use this I O pin for special functions For example control LED and can be used External Interrupts If don t use this just NC WAKE_UP EB 5318RF power on WAKE_UP will output 1 8V ON_OFF This pin is controlled EB 5318RF power on If EB 5318RF want to
10. ART Built in LNA with in CHIP Compact size 15 2mm 14 mm 2 4mm suitable for space sensitive application One size component easy to mount on another PCB board Support NMEA 0183 V3 0 GGA GSA GSV RMC VTG GLL ZDA Support OSP protocol MEMS Support 3 axis Magnetometer for compass heading for Point and Tell feature MicroPower Mode MPM Reduce MPM current consumption from lt 500 uA to lt 125 uA Support SBAS WASS EGNOS MSAS GAGAN 2012 8 31 2 Product Pin Description 19 17 16 15 14 13 12 11 10 9 PIN Number s Name Type Description Note 1 3 9 18 19 GND P Ground 2 RF IN RF GPS antenna input 4 RESET_N l System reset active low 5 VCC P Main power supply to the engine board 6 V_BAT P Backup battery supply voltage 7 8 NC EB 5318RF reverse pin 10 BOOTSEL Set this pin to high for programming flash This is the main transmits channel for outputting navigation and measurement data 11 TXD O a to user s navigation software or user written software Output TTL level OV 2 85V This is the main receive channel for receiving 42 RXD software commands to the engine board from SiRFdemo software or from user written software 13 DR_I2C_DIO I O Host I2C Interface re 14 DR_I2C_CLK I O Support MEMS Sensor 1 8V Level 15 TIMEPULSE O One pulse per second output 1PPS 16 ON OFF ON_OFF pin is used to command the 2 EB 5318RF to turn o
11. Format Name Example Units Description Message ID GPVTG VTG protocol header Course 309 62 degrees Measured heading Reference T True Course degrees Measured heading Reference M Magnetic Speed 0 13 knots Measured horizontal speed Units N Knots Speed 0 2 Km hr Measured horizontal speed Units K Kilometers per hour Mode A A Autonomous D DGPS E DR N Output Data Not Valid R Coarse Position S Simulator Checksum 23 lt CR gt lt LF gt End of message termination 1 SiRF Technology Inc does not support magnetic declination All course over ground data are geodetic WGS84 directions 2 Position was calculated based on one or more of the SVs having their states derived from almanac parameters as opposed to ephemerides 2012 8 31 15 ZDA Time and Date This message is included only with systems which support a time mark output pulse identified as 1PPS Outputs the time associated with the current 1PPS pulse Each message is output within a few hundred ms after the 1PPS pulse is output and tells the time of the pulse that just occurred Table B 11 contains the values for the following example GPZDA 181813 14 10 2003 4F lt CR gt lt LF gt Table B 11 ZDA Data Format Name Example Unit Description Message ID GPZDA ZDA protocol header The UTC time units are hh UTC hours from 00 to 23 mm UTC minutes from 00 to 59 ss
12. Hz constant output with checksum enabled PSRF103 05 00 01 01 20 Example 3 Disable VTG message PSRF103 05 00 00 01 21 2012 8 31 19 E LLA Navigation Initialization ID 104 Parameters required to start using Lat Lon Alt This command is used to initialize the module for a warm start by providing current position in Latitude Longitude Altitude coordinates clock offset and time This enables the receiver to search for the correct satellite signals at the correct signal parameters Correct initialization parameters will enable the receiver to acquire signals more quickly and thus will produce a faster navigational soution When a valid LLA Navigation Initialization command is received the receiver will restart using the input parameters as a basis for satellite selection and acquisition Format PSRF104 lt Lat gt lt Lon gt lt Alt gt lt ClkOffset gt lt TimeOfWeek gt lt WeekNo gt lt ChannelCount gt lt ResetCfg gt CKSUM lt CR gt lt LF gt lt Lat gt Latitude position assumed positive north of equator and negative south of equator float possibly signed lt Lon gt Longitude position it is assumed positive east of Greenwich and negative west of Greenwich Float possibly signed lt Alt gt Altitude position float possibly signed lt ClkOffset gt Clock Offset of the receiver in Hz use 0 for last saved value if available If this is unavailable a default value of 75000 for
13. T32 lt Z gt Z coordinate position INT32 lt ClkOffset gt Clock offset of the receiver in Hz Use 0 for last saved value if available If this is unavailable a default value of 75000 for GSP1 95000 for GSP 1 LX will be used INT32 lt TimeOf Week gt GPS Time Of Week UINT32 lt WeekNo gt GPS Week Number UINT16 Week No and Time Of Week calculation from UTC time lt chniCount gt Number of channels to use 1 12 If your CPU throughput is not high enough you could decrease needed throughput by reducing the number of active channels UBYTE lt ResetCfg gt bit mask 0x01 Data Valid warm hot start 1 0x02 clear ephemeris warm start 1 0x04 clear memory Cold start 1 UBYTE Example Start using known position and time PSRF 101 2686700 4304200 3851624 96000 497260 921 12 3 7F C Set DGPS Port ID 102 Set PORT B parameters for DGPS input This command is used to control Serial Port B that is an input only serial port used to receive RTCM differential corrections Differential receivers may output corrections using different communication parameters The default communication parameters for PORT B are 9600Baud 8data bits 0 stop bits and no parity If a DGPS receiver is used which has different communication parameters use this command to allow the receiver to correctly decode the data When a valid message is received the parameters will be stored in battery backed SRAM and then the receiver will res
14. id Separation Units M meters Age of Diff Corr second Null fields when DGPS is not used Diff Ref Station ID 0000 Checksum 18 lt CR gt lt LF gt End of message termination Table B 3 Position Fix Indicator Value Description 0 Fix not available or invalid 1 GPS SPS Mode fix valid 2 Differential GPS SPS Mode fix valid 3 Not supported 6 Dead Reckoning Mode fix valid 2012 8 31 10 Note A valid status is derived from all the parameters set in the software This includes the minimum number of satellites required any DOP mask setting presence of DGPS corrections etc If the default or current software setting requires that a factor is met then if that factor is not met the solution will be marked as invalid GLL Geographic Position Latitude Longitude Note Fields marked in italic red apply only to NMEA version 2 3 and later in this NMEA message description Table B 4 contains the values for the following example GPGLL 3723 2475 N 12158 3416 W 161229 487 A A 41 Table B 4 GLL Data Format Name Example Units Description Message ID GPGLL GLL protocol header Latitude 3723 2475 ddmm mmmm N S Indicator jn N north or S south Longitude 12158 3416 dddmm mmmm E W Indicator W E east or W west UTC Position 161229 487 hhmmss sss Status A A data valid or V data not valid Mode A A Autonomous D DGPS E DR N Output Data Not Valid R Coarse Position S S
15. ime This is not available in Trickle Power mode If do not use it Just NC 2012 8 31 ON_OFF The ON_OFF pin commands the EB 5318RF ON or OFF There are multiple methods of connecting this pin for different applications in order to minimise host resource requirements The ON_OFF pin is used to command the EB 5318RF to turn on or off The turn on command is a hardware feature of the Power Control FSM based on sensing a rising edge on the pin The turn off command is a software feature based on interrupts related to rising and or falling edges and or sensing of pin levels Not currently supported The ON_OFF pin processing is carried out by the Power Control FSM The ON_OFF rising edge event during low power modes is recorded in a status register that is subsequently read by the processor once it is running When the processor is running at the time of an ON_OFF event the processor can poll the status or set up an interrupt WAKE_UP System power controller wnen EB 5318RF Power ON this pin will output 1 8Vac TXD This is the main transmits channel for outputting navigation and measurement data to user s navigation software or user written software Output is TTL level OV 2 85V RXD This is the main channel for receiving software commands from SiRFdemo software or from your proprietary software DR I2C Interface The I2C host port interface supports Operation up to 400kbps Individual transmit and
16. imulator Checksum 41 lt CR gt lt LF gt End of message termination 1 Position was calculated based on one or more of the SVs having their states derived from almanac parameters as opposed to ephemerides 2012 8 31 11 GSA GNSS DOP and Active Satellites Table B 5 contains the values for the following example GPGSA A 3 07 02 26 27 09 04 15 1 8 1 0 1 5 33 Table B 5 GSA Data Format Name Example Units Description Message ID GPGSA GSA protocol header Mode 1 A See Table B 6 Mode 2 3 See Table B 7 Satellite Used 07 Sv on Channel 1 Satellite Used 02 Sv on Channel 2 Satellite Used Sv on Channel 12 PDOP 1 8 Position dilution of Precision HDOP 1 0 Horizontal dilution of Precision VDOP 1 5 Vertical dilution of Precision Checksum 33 lt CR gt lt LF gt End of message termination 1 Satellite used in solution 2 Maximum DOP value reported is 50 When 50 is reported the actual DOP may be much larger Table B 6 Mode1 Value Description M Manual forced to operate in 2D or 3D mode A 2Dautomatic allowed to automatically switch 4 Table B 7 Mode 2 Value Description 1 Fix Not Available 2 2D lt 4 SVs used 3 3D gt 3 SVs used 2012 8 31 12 GSV GNSS Satellites in View Table B 8 contains the values for the following example GPGSV 2 1 07 07 79 048 42 02 51 062 43 26 36 256 42 27 27 138 42
17. ly VCC V RF Input Input Impedance 50 Q Operating Frequency 1 575 Ghz DC Electrical characteristics Parameter Symbol Min Typ Max Conditions Units High Level Input Voltage ViH 0 7 VCC 3 6 V Low Level Input Voltage Vit 0 4 0 45 V High Level Output Voltage VoH 0 75 Vgcc Vgcc V Low Level Output Voltage VoL 0 4 V High Level Output Current loH 2 mA Low Level Output Current lou 2 mA Vgcc is SIRF Star IV Chip power input 1 8V Vin 2012 8 31 Receiver Performance _ Tracking 163dBm Sensitivity a Autonomous acquisition 160 dBm lt 35s Cold Start Autonomous lt 15s with CGEE Time To First Fix Warm Start Autonomous lt 35s lt 15s with CGEE Hot Start Autonomous lt 1s Horizontal Position Accuracy Autonomous lt 2 5m 5 Speed lt 0 01 m s Velocity Accuracy Heading lt 0 01 degrees Reacquisition 0 1 second average Update Rate 1 Hz 5 Hz Maximum Altitude lt 18 000 meter Maximum Velocity lt 515 meter second Maximum Acceleration lt 4G lt Note gt 1 50 130dBm Fu 0 5ppm Tu 2s Pu 30Km 2 Commanded Warm START 3 Commanded Hot START 4 50 24hr static 130dBm 5 50 30m s Environmental Characteristics Parameter Min Typ Max Unit Humidity Range 5 95 non condensing Operation Temperature 40 85 C Storage Temperature 40 85 C 2012 8 3
18. n or off 17 WAKE_UP O System power on 1 8V output 3 lt Note gt 2012 8 31 1 GPIO is 1 8V Level 2 The ON_OFF pin commands the EB 5318RF ON or OFF The turn ON command is a hardware feature of the Power Control FSM when sensing a rising edge on the pin The turn OFF command is a software feature based on interrupts related to rising and or falling edges and or sensing of pin levels 3 The WAKE_UP pin is an output from the EB 5318RF used to enable an external PMIC A low on this output indicates that the EB 5318RF is in one of its low power states KA only Hibernate or Standby mode and requires no more than 60UA of current on the VIO_18 input A high on this output indicates that the EB 5318RF is in operational mode requiring an external regulator to provide enough current on both the VIO_18 and VREG_18 inputs to handle the peak current requirements of the EB 5318RF 4 The DR mode 12C interface provides support for dead reckoning DR and code upload The port has 2 pins DR_DIO and DR_CLK both pins are pseudo open drain and require pull up resistors on the external bus Electrical Specification Absolute Maximums Ratings Parameter Min Typ Max Conditions Unit POWER Supply Main power supply VCC 3 1 3 3 3 5 V Backup battery supply 2 0 3 5 V 45 50 55 GPS is not 3D Fixed mA Main power supply Current 35 38 45 GPS is 3D Fixed mA RF POWER Supp
19. on grid system that may be translated into local coordinate systems or map datums Local map datums are a best fit to the local shape of the earth and not valid worldwide Examples Datum select TOKYO_MEAN PSRF106 178 32 Name Example Unit Description Message ID PSRF106 PSRF106 protocol header Datum 178 21 WGS84 178 TOKYO_MEAN 179 TOKYO_JAPAN 180 TOKYO_KOREA 181 TOKYO_OKINAWA Debug Checksum 32 lt CR gt lt LF gt End of message termination 2012 8 31 21 PCB Layout Recommend Recommended Layout PAD et Unit mm Tolerance 0 4mm PCB Layout Recommendations Do not routing the other signal or power trace under the engine board RF This pin receives signal of GPS analog via external active antenna It has to be a controlled impedance trace at 50ohm Do not place the RF traces close to the other signal path and not routing it on the top layer Keep the RF traces as short as possible Antenna Keep the active antenna on the top of your system and confirm the antenna radiation pattern gt axial ratio gt power gain noise figure gt VSWR are correct when you Setup the antenna in your case 2012 8 31 22 Recommended Reflow Profile Temperature C 240 C Max 10 ls 23545 C 200 150 10 lt 30 10s _ 9030s Time sec Pre heating temperature 150 10 C Pre heating time 90 30 sec Heating temperature 235
20. receive FIFO lengths of 64B m The default 12C address values are Rx 0x60 Tx 0x62 Multi master I2C mode is supported by default Dead reckoning applications support the DR I2C interface The I2C interface supports required sensor instruments such as gyros 2012 8 31 accelerometers compasses or other sensors that can operate with an I2C bus DRI2C interface supports Typical data lengths command in data out of several bytes Standard I2C bus maximum data rate 400kbps Minimum data rate 100kbps SOFTWARE COMMAND NMEA Output Command GGA Global Positioning System Fixed Data Note Fields marked in italic red apply only to NMEA version 2 3 and later in this NMEA message description Table B 2 contains the values for the following example GPGGA 161229 487 3723 2475 N 12158 3416 W 1 07 1 0 9 0 M 34 2 M 0000 18 Table B 2 GGA Data Format Name Example Units Description Message ID GPGGA GGA protocol header UTC Time 161229 487 hhmmss sss Latitude 3723 2475 ddmm mmmm N S Indicator N N north or S south Longitude 12158 3416 dddmm mmmm E W Indicator W E east or W west Position Fix Indicator 1 See Table B 3 Satellites Used 07 Range 0 to 12 HDOP 1 0 Horizontal Dilution of Precision MSL Altitude 9 0 meters Units M meters Geoid Separation 34 2 meters Geoid to ellipsoid separation Ellipsoid altitude MSL Altitude Geo
21. tart using the saved parameters Format PSRF102 lt Baud gt lt DataBits gt lt StopBits gt lt Parity gt CKSUM lt CR gt lt LF gt 2012 8 31 18 lt baud gt 1200 2400 4800 9600 19200 38400 lt DataBits gt 8 lt StopBits gt 0 1 lt Parity gt 0 None Odd 1 Even 2 Example Set DGPS Port to be 9600 8 N 1 PSRF102 9600 8 1 0 12 D Query Rate Control ID 103 Query standard NMEA message and or set output rate This command is used to control the output of standard NMEA message GGA GLL GSA GSV RMC VTG Using this command message standard NMEA message may be polled once or setup for periodic output Checksums may also be enabled or disabled depending on the needs of the receiving program NMEA message settings are saved in battery backed memory for each entry when the message is accepted Format PSRF103 lt msg gt lt mode gt lt rate gt lt cksumEnable gt CKSUM lt CR gt lt LF gt lt msg gt 0 GGA 1 GLL 2 GSA 3 GSV 4 RMC 5 VTG 6 MSS if internal beacon is supported 7 Not defined 8 ZDA if 1PPS output supported 9 Not defined lt mode gt 0 SetRate 1 Query 2 ABP On 3 ABP Off lt rate gt Output every lt rate gt seconds off 0 max 255 lt cksumEnable gt _ 0 disable Checksum 1 Enable checksum for specified message Example 1 Query the GGA message with checksum enabled PSRF103 00 01 00 01 25 Example 2 Enable VTG message for a 1
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