User's Manual - Cheng Holin Technology Corp
Contents
1. gt Explanation Contents Example Unit Explanation Sentence ID GPGLL GLL header Latitude 3537 1483 dd mm mmmm North South N N North Latitude S South Latitude Longitude 13943 8511 ddd mm mmmm 1 East West E E East Longitude W West Longitude 1 UTC of position 2 034639 hh Hours mm Minutes ss Seconds Status A A Data valid V Data invalid Mode Indicator A A Autonomous D D GPS N Data not valid 3 checksum 41 lt CR gt lt LF gt End of sentence gt Example GPGLL 3537 1483 N 13943 8511 E 034639 A A 41 gt Note GE 218S GPS Receiver Module 1 The Longitude is always expressed as 0 degree when the Latitude is 90 degree and is expressed as Longitude 0 180 degree East when the Longitude is 0 180 degree West 2 During non position fixes this value is increased from the last position calculation time by one second 3 Position system mode indicator 4 1 3 GPGSA sentence gt Explanation Contents Example Explanation Sentence ID GPGSA GSA header Mode A M Manual A Automatic Positioning mode 3 1 Fix not available 2 2D 3 3D Satellite ID number 05 ID number of satellite used in solution Satellite ID number 06 ID number of satellite used in solution PDOP Display of quantity used 12 max 01 6 HDOP 01 0 7 VDOP 01 3 checksum 05 lt CR gt lt LF gt End o2. 1 2 Features The GE 218S provides the features that make the host easy for integration v Full implementation of SONY CXD2951 architecture 12 parallel satellite tracking channels for fast acquisition and reacquisition Provide superior navigation performance in urban canyon and foliage environments Full navigation accuracy provided by Standard Positioning Service SPS Integrated powerful CPU base band and RF hardware in an SOC System On Chip design reduces the space and power consumption in state of the art XSNSSK YN Advanced IC technology gets the total receiver cost saving Allows the receiver to track the satellites using up to 12 channel correlators High performance firmware drives an excellent positioning speed Serial communication channel with pre defined baud rate No any initialization setup is required while start to use Support NMEA0183 v3 01 data protocol or SONY proprietary protocol High performance firmware drives an excellent positioning speed Support super cap to sustain internal clock Fully shielded Power saving support X NNN NNN NNN GE 218S GPS Receiver Module 1 3 Technical Specifications Features Specifications GPS receiver L1 C A code 12 channels Tracking sensitivity 152dBm average or better Acquisition sensitivity 139dBm average or better TTFF Time to First Fix Cold Start 50s average 60s 95 possibility Warm Start 35s average 40s
3. gt Usage method NC dddddddd d 0 1 215 gt Explanation This command sets the output intervals for individual NMEA sentences GGA GLL GSA GSV RMC VTG ZDA and SONY original sentence PSGSA The command requires 8 integer values 0 1 2 5 The first number indicates the GGA output interval the second indicates the GLL output interval the third indicates the GSA output interval the fourth indicates the GSV output interval the fifth indicates the RMC output interval the sixth indicates the VTG output interval the seventh indicates the ZDA output interval and the eighth indicates the PSGSA output interval There are four different interval settings 0 1 2 and 5 If 0 is set the message is not output If any output interval arguments are not set the current setting is used The default setting is 10111000 for baud rate 4800bps GGA GSA GSV and RMC are output every second GLL VTG ZDA and PSGSA are not For baud rate 9600bps and above the default setting is 10111111 It means GGA GSA GSV RMC VTG ZDA and PSGSA are output every second GLL is not gt Example 1 To output GGA every time and output GSA once every two times 16 GE 218S GPS Receiver Module NC 10200000 gt Example 2 To output RMC only every time NC 00001000 4 4 3 CLR command clear set parameters gt Usage method CLR gt Explanation This command resets the user set parameters to the default values clears the time position Al
4. 40 6 mm Notes 1 J2 The DC power connector is connected to DC 5V power supply 22 GE 218S GPS Receiver Module 2 JP1 Serial communication interface connector is defined in section 3 2 3 P1 RS 232 port 1 is used to output the NMEA 0183 data and also used to input and output binary messages 4 P2 RS 232 port 2 There is no such port for GE 218S 5 2 Serial Communication interface Refer to section 3 2 for the pin definitions of 20 pin serial communication interface connector 5 3 Installation First it needs to connect the GE 218S engine board to the evaluation kit The evaluation kit provides the physical link conversion for the serial communication It can connect the P1 RS 232 port of the evaluation kit to COM port of the PC for testing Second it needs to setup the testing software on PC We support a testing utility Stella on PC for customer test It can also run other GPS testing tool from third party supplier 5 4 LED indications There are two LEDs on the evaluation kit One is for power on indicator and another is the GPS status indicator 23
5. 95 possibility Hot Start 2s minimum 6s 95 possibility Positioning accuracy Standard Positioning Service SPS WAAS optional 2DRMS approx 5m Time accuracy Precision 1us or less Measurement data output Update time 1 second NMEA output protocol V 3 01 Baud rate 9600bps 8 N 1 Datum WGS 84 Type RMC only Power consumption 47 mA average tracking 77 mA average acquisition All without antenna Power supply 5V DC Antenna RF connector Active typical gain 27dB noise figure 1 5dB MCX Antenna power supply 3 3V Operating temperature 40 C 85 C Storage temperature 55 C 100 C 1 Serial communication channel and user selectable baud rate among 4800 9600 1 4 Serial Communication Interface 19200 and 38400 default 4800 bps 2 NMEA 0183 Version 3 01 ASCII output GGA GLL GSA GSV RMC VTG ZDA GE 218S GPS Receiver Module 2 Operational Characteristics 2 1 As soon as the initial self test is complete the GE 218S engine board begins the process of satellite acquisition and tracking automatically After a position fix has been calculated information about valid position velocity and time is transmitted over the output Initialization channel The GE 218S engine board utilizes initial data such as last stored position date time and satellite orbital data to achieve maximum acquisition performance If the
6. A PSGSA header Positioning mode 4 See table Calculation satellite ID 11 Satellite ID number used in speed calculation Calculation satellite ID 23 Satellite ID number used in speed calculation X Display quantity of satellite used 12 max PDOP 01 5 Speed calculation PDOP 1 HDOP 00 9 Speed calculation HDOP 1 VDOP 01 2 Speed calculation VDOP 1 TCXO offset value 01682 Hz 2 Positioning calculation 10270708 hhmmssxx hh Hours mm Minutes ss seconds time xx 0 01seconds Time determined in positioning calculation SONY Reserve D Reserved checksum 29 lt CR gt lt LF gt End of message Value Explanation Speed non positioning 2D speed positioning Pseudo 3D speed positioning 3D speed positioning O0O M 0 gt Example PSGSA 4 11 23 27 03 08 28 20 31 01 5 00 9 01 2 01682 10270708 D 29 gt Note 1 The DOP value is expressed as two integer digits and one decimal digit Values 99 9 and higher are expressed as 99 9 2 The TCXO offset value is expressed as five integer digits Values 99999 99999 and higher lower expressed as 99999 99999 4 2 NMEA Message Data Output Specifications The following table describes the output data configurations in the following positioning states GE 218S GPS Receiver Module immediately after cold start during positioning during non positioning and after positioning 4 2 1 GPGGA sentence Conten
7. East West null null null Mode Indicator N AorD N During non position fixes this value is increased from the last position calculation time by One second 4 2 6 GPVTG sentence Contents After cold start During positioning During non positioning Course True null Positioning results Previous value Course Magnetic null null null Speed knot null Positioning results Previous value Speed km h null Positioning results Previous value Mode Indicator N AorD N 4 2 7 GPZDA sentence Contents After cold start During positioning During non positioning UTC default 00 00 00 UTC UTC Day default 01 UTC UTC Month default 03 UTC UTC Year default 2003 UTC UTC Local zone hours null null null Local zone minutes null null null 4 2 8 PSGSA message GE 218S GPS Receiver Module Contents After cold start During positioning During non positioning 0 Positioning mode 0 1or2or3 Calculation satellite ID null Positioning results null PDOP Calculation results Positioning results null HDOP Calculation results Positioning results null VDOP Calculation results Positioning results null TCXO offset value 00000 Positioning results Previous value Positioning calculation time null Positioning results null During non positioning based on DOP limit restri
8. GPGSV and GPRMC as default Single message example GPGGA 071141 3536 6019 N 13944 8906 E 1 07 01 0 00092 2 M 039 2 M 46 GPGSA A 3 03 08 11 19 20 27 28 02 1 01 0 01 9 06 GPGSV 3 1 09 11 81 327 52 19 43 069 49 20 33 163 45 28 32 314 47 7E GPGSV 3 2 09 03 18 093 42 08 29 254 43 27 21 234 44 31 00 41 GPGSV 3 3 09 07 00 3 77 GE 218S GPS Receiver Module GPRMC 071141 A 3536 6019 N 13944 8906 E 000 0 000 0 091204 A 7D GPVTG 000 0 T M 000 0 N 000 0 K A 0D GPZDA 071142 09 12 2004 45 PSGSA 4 11 03 28 20 19 27 08 02 1 01 0 01 9 01028 07114063 5 5C t 1 GPGGA GPGSA GPGSV GPRMC GPVTG GPZDA PSGSA t 2 t 3 t 4 t 5 T GPGGA GPGSA GPGSV Single message example at 4800 bps GPGGA 112350 3536 6006 N 13944 8931 E 1 08 00 9 00098 1 M 039 2 M 44 GPGSA A 3 09 10 17 18 21 26 28 29 02 1 00 9 01 8 00 GPGSV 3 1 11 05 02 178 00 08 03 039 00 09 52 208 46 10 34 120 43 77 GPGSV 3 2 11 15 09 322 26 17 20 175 41 18 28 313 38 21 43 283 48 78 GPGSV 3 3 11 26 59 023 50 28 18 063 39 29 50 044 45 46 GPRMC 112350 A 3536 6006 N 13944 8931 E 000 0 016 2 240304 A 7B t 1 2 t 3 t 4 4 1 1 GPGGA sentence gt Explanation Contents Example Unit Explanation Sentence ID GPGGA GGA header UTC of position 1 012041 hh Hours mm Minutes ss Seconds Latitude 3537 1464 dd mm mmmm 2 North South N N North Latitude S South Latitude L
9. T port is supported 2 There is no GPIO support 3 For demand of different baud rate and output sentences please contact Youngtek MOQ is required GE 218S GPS Receiver Module 4 Software Interface 4 1 NMEA Transmitted Messages The GPS Receiver Module interface protocol is based on the National Marine Electronics Association s NMEA 0183 interface specification which is defined in NMEA 0183 Version 3 01 This engine board doesn t support the Radio Technical Commission for Maritime Services RTCM for Differential Navstar GPS Services The default communication parameters for NMEA output are 4800 baud 8 data bits 1 stop bit and no parity The NMEA 0183 Output Messages are shown as below NMEA Record Descriptions GPGGA Global positioning system fixed data GPGLL Geographic position latitude longitude GPGSA GNSS DOP and active satellites GPGSV GNSS satellites in view GPRMC Recommended minimum specific GNSS data GPVTG Course over ground and ground speed GPZDA Time amp Date It outputs messages in NMEA0183 Ver 3 01 format and can output 8 different types of sentence GPGGA GPGLL GPGSA GPGSV GPRMC GPVTG GPZDA and PSGSA If 9600bps or 19200bps or 38400bps baud rate is set for port setting it outputs 7 types of sentence GPGGA GPGSA GPGSV GPRMC GPVTG GPZDA and PSGSA as default Moreover if 4800bps baud rate is set it outputs 4 types of sentences GPGGA GPGSA
10. User s Manual GE 218S GPS Receiver Module Version 1 00 11 GE 218S GPS Receiver Module Revision History Ver Date Description 1 00 Nov 14 2006 Initial Draft ill Contents 1 INTRODUCTION vise cssccsssssacsssacsecesscssncsenncsncsasnssncsseadsndsdeassncsoencsecsdunsonsesundsesadensdecssendsacesenssecasendsedadonsdes 1 1 OVERVIEW A AO 1 2 FEATURES SER raid 1 3 TECHNICAE SPECIFICATIONS co naeh cova E EA oi Pa aa 1 4 SERIAL COMMUNICATION INTERFACE orire ea I TEREE EREE EEEE EEE EAEE 2 OPERATIONAL CHARACTERISTICS seeseeseesoesessoesoesossossossossossossessoseoesossossoseessossossessossossessessesesse 2 1 INITIALIZATION 22 nn ee E EE a AN eS A E EN EAS 2 2 NAVIGATION diia ie caian sees 3 HARDWARE INTERFACE ccsssoossosssssssnsssnsssnnssnnssnnssnnssnnnsnnssnnnsnnssnnnsnnnsnnnsnnnsnnnsnnnsnnnsnnnsnnnsnnnsnnnsnnnenn 3 1 PCB DIMENSION AND LAYOUT DESCRIPTIONS ccccceeesesssneeeeceeeeesssseeeceeeeeeeessnneeeeeeeeeeeeaees 3 2 20 PIN VO INTERFACE wz2ssvcseits voces cesuveevassvecaaceesceavaes vacances nest vauss eaaaseaveraveuss cepa oceania re 4 SOFTWARE INTERFACE sssississssessstsvatsvsnscassvadsvnssvsesvassvansvadsvansvassvadsvnssvsossassvadsvndsvansvassvadsvassoanssassvaness 4 1 NMEA TRANSMITTED MESSAGES ssssssecccceeeeeeessceeeceeceessssneeeeceeeesessaceceeceseeessaeeeeeeseees 4 1 1 GPGGA Sentencia ad ana 4 1 2 GPGLE SENTENCIA ie desa RSG 4 1 3 GRGSA Sentence
11. a emenate 4 1 4 GPGSV sentence au u uunauenasanawahanunawehansbenebanubansuseunbeselilsnils 4 1 5 GPRM G Sentences ccs cA AAS Se ee e 4 1 6 GRV UG SENLEN CO noia AE nn ohn Pht a E i 4 1 7 GPZDA Sentencia A Bas 4 1 8 PSGSA Sentence usnsasisrssnsssseiesssensunassgesensgenenentsesekenenensnsnssenekenansnetenssehnkonaenedeehseheseheger essen 4 2 NMEA MESSAGE DATA OUTPUT SPECIFICATIONS ssccccceeeeeesssseeeecceceeesssnneeceeeeeeeessnaeeeeeeeeees 4 2 1 GRG GA Sentenee ausser cabs cide raras tees eher Seb scecaQeosndes Hes ledeteon ds 4 2 2 EI LE D EIA AE AAE A A A 4 2 3 GPGSA SEN ence niini niina Eea A A AAA A ia 4 2 4 GPGSV sentene ane inaa A E A A EE AEE EE A A EE S 4 2 5 GPRMG SONLENGCE ita it ita ea A E A E E ORR E ES hak eE bs ES haa aos 4 2 6 EI AARE RALAT E AA A EE A E E EE ORs 4 2 7 GPZDA Sentence iii A cdani 4 2 8 PSGSA IA OS 4 3 NMEA MESSAGE OUTPUT TIMING ccccceeeesesssceeeeceeeessssnnceeeeeeeeesssneeeeeeeesesessnaeeeeeeeeeeesaaees 4 4 COMMUNICATION COMMAND Hi essen A AE R T S 4 4 1 Command Format nesioti ii iris es EEN adn ego 4 4 2 NC command NMEA sentence output interval setting ccscccsecceeseeesceesnceceseeeeseeesneessaeees GE 218S GPS Receiver Module GE 218S GPS Receiver Module 443 CLR command clear set parameters 17 444 CD command cold start A Ranney Renee heat ued aM ea a 17 445 SW command warm SEAL te ca tates sa cats Nan 17 446 SR command hol Star nassen 18 447 OI command mess
12. age output interval setting 18 448 CB command change baud TALE tas 18 449 PLM command low power mode setting eeenenenenenenenennennennennn 19 4410 WA command WAAS EGNOS function setting 20 ENGINE BOARD EVALUATION KIT c0ss2000000s0000000200000220000002000000 0200000000000 00 0000000 ansnse essen 22 5 1 OVERVIEW lb ehltiln ek et cuha sien seadaaht cobs gen EEE GA 22 5 2 SERIAL COMMUNICATION INTERFACE ssssccesssceeceesceecesseeeceesseeecessseeecesaeeseesaeeesessaeeeeesaaees 23 5 3 INSTALLATION A NS 23 5 4 ADA A O 23 GE 218S GPS Receiver Module 1 Introduction 1 1 Overview The GE 218S engine board is a self contained GPS receiver module The GPS signal receiving data acquisitioning and positioning meet the needs such as car navigation mapping surveying agriculture and so on GE 218S communicates with other electronic utilities via compatible serial communication channels and saves useful satellite data by memory backup to speed up the positioning With low power consumption of 39mA the GE 218S tracks satellites using up to 12 channel correlators at a time It re acquires satellite signals in 100 ms and updates position data every second Advanced power saving mechanism allows the unit to operate at a fraction of the time and enter low power mode as it is idle Intelligently saving satellite data and tracking history permits the user to have a quick position fix even though the receiver usually stays off
13. ctions the DOP value is displayed 4 3 NMEA Message Output Timing NMEA messages are output within 1 s after the 1PPS pulse as shown in figure below t 1 t 2 t 3 t 4 t 5 t 6 T gt 1 PPS lt LALALALALE y EDOEDODAD E x S NMEA 4 4 Communication Command 4 4 1 Command Format The communication command format consists of O symbol a command and command parameters in that order Command input is recognized after a CR carriage return and a LF line feed are received When an input is successfully recognized an echo is sent back Then if the command name and specified parameter values are entered correctly the command is processed accordingly However if a command or characters other than those noted in this specification is used that operation cannot be guaranteed Command length has a maximum limit of 127 characters from symbol to line feed If there are over 128 characters including line feed the operation cannot be guaranteed When the command is processed properly a processing message shown below is output as follows according to the command contents GE 218S GPS Receiver Module gt Response to a basic command Example 1 SCD Command transmission 2 SCD Echo back 3 CD Done Processing message 1 Command transmission 2 Echo back 3 Processing message 4 4 2 NC command NMEA sentence output interval setting
14. e low to reset the engine board Input This pin provides an active low reset input to the engine board Activation of this pin will reset and start acquisition process It may be left open if not utilized To reset it the low period of this input signal should be at least 100ms 6 NC No function N A Do not connect this pin Leave it open 7 NC No function N A Do not connect this pin Leave it open 8 NC No function N A Do not connect this pin Leave it open 9 NC No function N A Do not connect this pin Leave it open 10 GND Ground Input 11 TXDA Serial data output A transmit data Output No parity 8 bit data 1 stop bit NMEA and binary message data output TTL Output High voltage Min 2 4V Output Low voltage Max 0 4V 12 RXDA Serial data input A receive data Input Binary message data input TTL Input High voltage 2 0 3 6V Input Low voltage 0 3 0 8V 13 GND _ Ground Input 14 NC No function N A Do not connect this pin Leave it open 15 NC No function N A Do not connect this pin Leave it open 16 GND Ground Input 17 NC No function N A Do not connect this pin Leave it open 18 GND _ Ground Input 19 1PPS Time mark output for one pulse per second Output This pin provides One Pulse Per Second output from the engine board which is synchronized to GPS time 20 NC No function N A Do not connect this pin Leave it open Notes 1 Only one UAR
15. entence ID GPRMC RMC header UTC of position fix 1 093931 hh Hours mm Minutes ss Seconds Status A A Data valid V Data invalid Latitude 3536 5987 dd mm mmmm North South N N North Latitude S South Latitude Longitude 13944 8905 ddd mm mmmm 2 East West E E East Longitude W West Longitude 2 Speed over ground 000 0 knots Receiver s speed 3 Course over ground 090 7 degrees Receiver s direction of travel Moving clockwise starting at due north Date 241203 dd Day mm Month yy Year Magnetic variation degrees 4 East West E East W West 4 Mode Indicator A A Autonomous D D GPS N Data not valid 5 checksum 76 lt CR gt lt LF gt End of sentence gt Example GPRMC 093931 A 3536 5987 N 13944 8905 E 000 0 090 7 241203 A 76 gt Note 1 During non position fixes this value is increased from the last position calculation time by one second 2 The Longitude is always expressed as 0 degree when the Latitude is 90 degree and is expressed as Longitude 0 180 degree East when the Longitude is 0 180 degree West 3 The Speed over ground is expressed as three integer digits and one decimal digit Values GE 218S GPS Receiver Module 999 9 and higher are expressed as 999 9 4 Travel direction Degree Magnetic is not output 5 Positioning system mode indicator 4 1 6 GPVTG sentence gt Explanation Contents Example Unit Exp
16. f sentence gt Example GPGSA A 3 05 06 09 14 18 23 25 30 01 6 01 0 01 3 05 gt Note The DOP value is expressed as two integer digits and one decimal digit Values 99 9 and higher are expressed as 99 9 4 1 4 GPGSV sentence gt Explanation Contents Example Unit Explanation Sentence ID GPGSV GSV header Total number of sentences 2 Total number of GSV sentences output 1 to 9 1 Sentence number 1 Sequence number within total number 1 to 9 Total number of satellites in 08 Number of satellites visible from receiver view Satellite ID number 05 Satellite ID 01 to 32 2 Elevation 61 degrees Elevation angle of satellite as seen from receiver 00 to 90 Azimuth 056 degrees Satellite azimuth as seen from receiver 000 to 359 SNR C N 35 dBHz Received signal level C N 00 to 99 3 Satellite ID number 14 Write for four satellites GE 218S GPS Receiver Module Elevation 52 degrees Azimuth 321 degrees SNR C N 42 dBHz checksum 70 lt CR gt lt LF gt End of sentence gt Example GPGSV 2 1 08 05 61 056 35 06 12 158 41 09 23 066 41 14 52 321 42 70 gt Note 1 For 4800 bps the maximum output lines are 3 lines 2 It is outputted in order of Satellite ID number 3 00 when not tracking 4 1 5 GPRMC sentence gt Explanation Contents Example Unit Explanation S
17. ing mode 1 2or3 1 Satellite ID number null Positioning results null PDOP null Positioning results null HDOP null Positioning results null VDOP null Positioning results null Non positioning results are based on DOP limit restrictions So the DOP value is displayed GE 218S GPS Receiver Module 4 2 4 GPGSV sentence Contents After cold start During positioning During non positioning Total number of sentences 1 Calculation results Calculation results Sentence number 1 Calculation results Calculation results Number of satellites in view 00 Calculation results Calculation results Satellite ID null Calculation results Calculation results Elevation null Calculation results Calculation results Azimuth null Calculation results Calculation results SNR C N null Calculation results Calculation results 4 2 5 GPRMC sentence Contents After cold start During positioning During non positioning UTC of position default 00 00 00 UTC Li Status V A V Latitude null Positioning results Previous value North South N Positioning results Previous value Longitude null Positioning results Previous value East West E Positioning results Previous value Speed over ground null Positioning results Previous value Course over ground null Positioning results Previous value Date default 010303 UTC UTC Magnetic null null null
18. initial data is inaccurate or the orbital data is obsolete it may take more time to achieve a position fix process The GE 218S engine board auto locate feature is capable of automatically determining the position fix without intervention from the host system 2 2 Navigation After the position fixing process is complete the GE 218S engine board sends valid navigation information over output channels These data include 1 2 Latitude longitude altitude Velocity Date time Error estimates Satellite and receiver status GE 218S GPS Receiver Module 3 Hardware Interface 3 1 PCB Dimension and Layout Descriptions Keepout 4 6 Solder mask 3 8 PTH 2 0 5 Notes 1 J1 The serial communication interface I O connector is connected to GPS application system 3 2 20 pin I O Interface GE 218S engine board supports a 20 pin I O connector to connect the host controller gt GE 218S GPS Receiver Module 19 1PPS 17 NC 15 NC 13 GND Antenna 11 TXDA q Connector J 9 NC s 7 NC 5 Reset 3 VBAT INC The pin definitions of 20 pin serial communication interface connector Pin Name Function YO Notes 1 NC No function N A Do not connect this pin Leave it open 2 VCC 5V DC power input Input Same as pin 4 3 VBAT 3 3V DC backup battery input Input Optional To reduce system startup time 4 VCC SV DC power input Input Same as pin 2 5 RESET Activ
19. interval interval 0111215 10 gt Explanation This command changes the output interval of positioning result messages The settings are 0 1 2 5 and 10 seconds If 0 is set message reporting isn t outputted To resume output set a value other than 0 If the interval value argument is not set the current setting is reported The setting is held internally even if the CD SW SS or SR reset commands are transmitted The default value is 1 gt Example Setting the output interval to every 5 seconds Ol 5 4 48 CB command change baud rate gt Usage method CB 4800 9600 19200 38400 GE 218S GPS Receiver Module gt Explanation This command changes the communication baud rate gt Note 1 The baud rate is defined by hardware setting The baud rate change using the CB command is valid only during the execution time It returns to default baud rate as it is restarted 2 After the baud rate is changed the communication is stopped and thus the message output stops To continue message output setting communication baud rate to new setting is required 3 The NMEA messages output of different baud rates are different Please see section 4 1 gt Example Change the communication baud rate to 38400 CB 38400 4 4 9 PLM command low power mode setting gt Usage method PLM 01 5 10 MD ME PD PE T 0 5 10 interval time of positioning MD stop message in interval time ME output message in
20. interval time PD not control EPORT12 synchronized with sleeping PE control EPORT12 synchronized with sleeping gt Explanation This command sets the low power mode If the low power mode is requested the position update will be intermittent as specified Interval time settings are 0 5 6 7 8 9 10 sec If O is set the low power mode is terminated and the GE 218S operates at the normal mode If ME is set NMEA messages are generated periodically at 1Hz Set MD if NMEA messages are not needed between the positioning updates If the all arguments are not set the current setting is reported If MD or ME PD or PE is not set the previous setting is held Default setting will be selected after the CD SW SS or SR commands The default values are GE 218S GPS Receiver Module Interval time O normal mode Message output ME Port control PD gt Note Suggest not use ME PE commands gt Example NEMA messages output in every 10 seconds and without port control PLM 10 MD PD 4 4 10 WA command WAAS EGNOS function setting gt Usage method WA ON OFF PRN ON WAAS EGNOS function ON OFF WAAS EGNOS function OFF PRN 0 120 138 WAAS EGNOS PRN number gt Explanation This command sets the WAAS EGNOS function When set to ON the GE 218S receives WAAS EGNOS satellite signals from specified PRN number satellite Correction information is downloaded after the initial position measurement The GE 218 outputs
21. lanation Sentence ID GPVTG VTG header Course over ground 275 6 degrees Receiver s direction of travel Moving clockwise starting at due north 7 Course over ground degrees Receiver s direction of travel 1 M Speed over ground 000 0 knots Receiver s speed knots 2 Unit N knots Speed over ground 000 0 km h Receiver s speed km h 2 Unit K km h Mode Indicator A A Autonomous D D GPS N Data not valid 3 checksum 0B lt CR gt lt LF gt End of sentence gt Example GPVTG 275 6 T M 000 0 N 000 0 K A 0B gt Note 1 Travel direction Magnetic Degrees is not output 2 The Speed over ground is expressed as three integer digits and one decimal digit Values 999 9 and higher are expressed as 999 9 3 Positioning system mode indicator 4 1 7 GPZDA sentence gt Explanation Contents Example Unit Explanation Sentence ID GPZDA ZDA header UTC 105512 UTC time Day 12 Day according to UTC time Month 11 Month according to UTC time Year 2003 Year according to UTC time Local zone hours hour i Local zone minutes minute checksum 48 lt CR gt lt LF gt End of sentence 11 GE 218S GPS Receiver Module gt Example GPZDA 105512 12 11 2003 48 gt Note Local zone hours and Local zone minutes are not output 4 1 8 PSGSA sentence gt Explanation Contents Example Unit Explanation Sentence ID PSGS
22. manac data Ephemeris data and TCXO offset value and restarts the equipment 4 44 CD command cold start gt Usage method CD gt Explanation This command performs a cold start reset Cold start resetting clears the time position Almanac data Ephemeris data and TCXO offset value and resets the software While some user set parameters are held others return to the default values 4 4 5 SW command warm start gt Usage method SW gt Explanation This command performs a warm start reset Warm start resetting clears the Ephemeris data and resets the software While some user set parameters are held others return to the default values gt Note If the GE 218S does not have Almanac data from four or more visible satellites a cold start is performed instead GE 218S GPS Receiver Module 4 4 6 SR command hot start gt Usage method SR gt Explanation This command performs a hot start reset Hot start resets the software while retaining the time initial position Almanac data Ephemeris data and TCXO offset value While some user set parameters are held others return to the default values gt Note If the GE 218S does not have Ephemeris data from four or more visible satellites then a warm start is performed instead If the GE 218S does not have Almanac data from four or more visible satellites then a cold start is performed 4 4 7 Ol command message output interval setting gt Usage method Ol
23. ongitude 13943 8529 Ddd mm mmmm 2 East West E E East Longitude W West Longitude 2 GPS Quality Indicator 2 0 Disabled 1 GPS positioning 2 D GPS positioning Number of satellites 07 Number of satellites used in positioning calculation 00 to 12 HDOP 01 2 3 Altitude 00101 2 meters 4 Unit M Meters GE 218S GPS Receiver Module Geoidal separation 039 2 meters 5 Unit M Meters Age of DGPS data 04 second Time elapsed since D GPS reception 6 DGPS reference station 0000 ID checksum 42 lt CR gt lt LF gt End of sentence gt Example GPGGA 01 2041 3537 1464 N 13943 8529 E 2 07 01 2 00101 2 M 039 2 M 04 0000 42 gt Note 1 During non position fixes this value is increased from the last position calculation time by one second 2 The Longitude is always expressed as 0 degree when the Latitude is 90 degree and is expressed as Longitude 0 180 degree East when the Longitude is 0 180 degree West 3 The DOP value is expressed as two integer digits and one decimal digit Values 99 9 and higher are expressed as 99 9 4 The elevation is expressed as five integer digits and one decimal digit Values of 99999 9 or more 99999 9 or less are expressed as 99999 9 99999 9 5 The difference from the geoidal surface is expressed as three integer digits and one decimal digit 6 The DGPS Age is expressed as two integer digits 4 1 2 GPGLL sentence
24. the corrected position once the information is decoded PRN number is the WAAS EGNOS satellite number If 0 is set the highest elevation angle WAAS EGNOS satellite is automatically selected When no argument is set the current settings are output When PRN is not set the previous settings are kept The setting is held internally even if the CD SW SS or SR commands are transmitted The default values are WAAS EGNOS function OFF PRN 0 automatic WAAS EGNOS satellite selection gt Note If WAAS EGNOS function is set to ON from OFF or it is set to OFF from ON a software reset 20 GE 218S GPS Receiver Module is performed Since WAAS EGNOS function can also be set to ON by the port setting user have to set Port EPORTS8 to Low in order to use WWA command gt Example WAAS EGNOS function is set to ON with automatic WAAS EGNOS satellite selection WA ON 0 21 GE 218S GPS Receiver Module 5 Engine Board Evaluation Kit 5 1 Overview The Evaluation Kit is defined specially for testing the GE 218S It connects to the GE 218S through JP1 20 pin connector and converts the serial communication signals to the RS 232 signal level It also connects the RS 232 signals to PC s COM port through P1 One can run the test program on PC to get the NMEA 0183 data and issue commands from PC for binary mode operations The Evaluation Kit outline is shown as below PCB Dimension 15 8mm Jd mm 34 4 mm 34 4 mm
25. ts After cold start During positioning During non positioning UTC of position default 00 00 00 UTC 1 Latitude null Positioning results Previous value North South N Positioning results Previous value Longitude null Positioning results Previous value East West E Positioning results Previous value GPS Quality Indicator 0 1or2 0 Number of satellites 00 Positioning results 00 HDOP null Positioning results null 2 Altitude null Positioning results Previous value Geoidal separation null Positioning results Previous value Age of DGPS data null null DGPS information null DGPS information DGPS reference station ID null null DGPS information null DGPS information _ During non position fixes this value is increased from the last position calculation time by one second 2 Non positioning results are based on DOP limit restrictions So the DOP value is displayed 4 2 2 GPGLL sentence Contents After cold start During positioning During non positioning Latitude null Positioning results Previous value North South N Positioning results Previous value Longitude null Positioning results Previous value East West E Positioning results Previous value UTC of position default 00 00 00 UTC UTC Status V A V Mode Indicator N AorD N 4 2 3 GPGSA sentence Contents After cold start During positioning During non positioning Mode A A A Position
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