ET102 User Manual
Contents
1. Name Example 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 dearees Channel 1 Maximum90 Azimuth 048 dearees_ 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 Dearees 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 Depending on the number of satellites tracked multiple messages of GSV data may be required MSS MSK Receiver Signal Table B 9 contains the values for the following example GPMSS 55 27 318 0 100 66 Table B 9 MSS Data Format Name Example Units Description Page 10 of 13 ET 102_data doc VA GlobalSat Wired by Wireless Message ID GMSS MSS protocol header Signal Strength 55 dB SS of tracked frequency Siqnal to Noise Ratio 27 dB SNR of tracked frequency Beacon Frequency _ 318 0 kHz Currently tracked frequency Beacon Bit Rate 100 Bits per second The MSS NMEA message can only be polled or scheduled using the MSK MNEA input message Reference MSK MSK Receiver Interface Note Available upon request not included in thi2. Power Input Input 3 VBAT Backup Battery Input 4 VDC Shorted with pin 2 Input 5 PBRES Push Button Reset Input Active Low Input 6 RESERVED Reserved Down load data from RS232 to flash ROM 7 SELECT Reserved 8 RESERVED Reserved Page 4 of 10 ET 102_data doc VA GlobalSat Wired by Wireless 9 RESERVED Reserved 10 GND Ground 11 TXA Serial Data Output A GPS Data Output 12 RXA Serial Data Input A Command Input 13 GND Ground 14 TXB Serial Data Output B No Used Output 15 RXB Serial Data Input B DGPS Data Input 16 GND Ground 17 RESERVED Reserved 18 GND Ground 19 TIMEMARK 1PPS Time Mark Output Output 20 RESERVED Reserved Page 5 of 10 ET 102_data doc V GlobalSat Wired by Wireless DIMENSIONS 21 5mm x 71 12mm x 7mm 6 5 COMPONENT SIDE 7 mm 21 5 men 49 PCB t 1 6 mm All SIDE VIEW RF_SHIELD pitch 2 0 mm ee WL 99D TOP VIEW Page 6 of 10 ET 102_data doc VA GlobalSat Wired by Wireless CONNECTOR INTERFACE Male PCB Header Digi Key Part No WM18841 ND PIN DESCRIPTION VANT DC Voltage is for active antenna VDC DC power input This is the main DC supply for a 3 8V 6 5V power module board VBAT Backup Batter This is the batter backup that powers the SRAM and RTC when main power is removed Typical current draw is 10uA Without and external backup battery or Gold capacito
3. RMS SA off 10 meters 2d RMS WAAS enable SA off 0 1 m s 95 SA off 1 microsecond synchronized to GPS time WGS 84 0 1 sec average 8 sec average 38 sec average 48 sec average 18 000 meters 60 000 feet max 515 meters second 1000 knots max 3 3 Vdc 5 5Vdc 60mA typical 25mA on trickle power mode 2 5V to 3 6V 10uA typical One for GPS one for DGPS TTL level ET 102 Output voltage level 0 3 5V RS 232 level ER 102 Full duplex asynchronous ASCII SiRf binary NMEA 0183 changeable Default NMEA SiRf binary gt gt Position Velocity Altitude Status and control NMEA 0183 gt gt GGA GSA GSV RMC VTG and GLL are optional Page 3 of 10 ET 102_data doc VA GlobalSat Wired by Wireless Software Command setting Default 4800bps for NMEA GPS Transfer Rate DGPS Protocol Time Mark Level Pulse Duration Time Reference Measurement Active Antenna Connector Environmental Characteristics Temperature Operating Storage Humidity RTCM SC 104 ver2 00 type 1 2 and 9 TTL 100ms At the pulse positive edge Aligned to GPS sec 1us MCX SMA SMB or others OEM specified connector avalible 40 deg C to 80 deg C 40 deg C to 85 deg C Up to 95 non condensing All product specifications subject to change without notice PIN ASSIGNMENT Pin No Name Description Type 1 VANT Antenna DC Voltage Input 2 VDC 3 8V 6 5V DC
4. 229 487 3723 2475 N 12158 3416 W 1 07 1 0 9 0 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 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 meters 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 SiRF Technology Inc does not support geoid corrections Values are WGS84 ellipsoid heights Page 8 of 11 ET 102_data doc VA GlobalSat Wired by Wireless Table B 3 Position Fix Indicator Value Description 0 Fix not available or invalid GPS SPS Mode fix valid 1 2 Differential GPS SPS Mode fix valid 3 GPS PPS Mode fix valid GLL Geographic Position Latitude Longitude Table B 4 contains the values for the following example GPGLL 3723 2475 N 12158 3416 W 161229 487 A 2C Table B 4 GLL Data Format Name Example Units Description Message ID GPGLL GLL protocol header Latitude 3723 2475 ddmm mmmm N S Indicator n N north or S sout
5. VA GlobalSat Wired by Wireless ET 102 ER 102 GPS RECEIVER ENGINE BOARD PRODUCT GUIDE Globalsat Technology Corporation Taiwan www globalsat com tw USGlobalSat Inc USA www usglobalsat com VA GlobalSat Wired by Wireless ET 102 ER 102 GPS BOARD Features SiRf GPS Architecture SiIRF Starll X Trac High and low power consumption chip set SnapLock 100ms re acquisition time Support standard NMEA 0183 protocol All in view 12 channel parallel processing Cold start under 45 seconds average Optional build in SuperCap to reserve system data for rapid satellite acquisition Superior urban canyon performance Foliage Lock for Weak signal tracking Built in super cap to reserve system data for rapid satellite acquisition Full duplex RS 232 port for navigation and control messages Differential GPS capability through 2 RS 232 port SPECIFICATIONS Electrical Characteristics Receiver Frequency L1 1575 42 MHz C A code 1 023 MHz chip rate Channels 12 Sensitivity 170dBW Page 2 of 10 ET 102_data doc VA GlobalSat Wired by Wireless Accuracy Position Velocity Time Datum Default Acquisition Time Reacquisition Hot start Warm start Cold start Dynamic Conditions Altitude Velocity Power Main power input Current supply Backup power Backup current Serial Port Ports Electrical level Communication Code type GPS Protocol GPS Output Message 15 meters 2D
6. h 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 Checksum 2C lt CR gt lt LF gt End of message termination 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 Mode1 A See Table B 6 Mode2 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 Page 9 of 12 ET 102_data doc VA GlobalSat Wired by Wireless Checksum 33 lt CR gt lt LF gt End of message termination 1 Satellite used in solution Table B 6 Mode1 Value Description M Manual forced to operate in 2D or 3D mode A 2Dautomatic allowed to automatically switch 2D 3D Table B 7 Mode 2 Value Description 1 Fix Not Available 2 2D 3 3D 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 71 GPGSV 2 2 07 09 23 313 42 04 19 159 41 15 12 041 42 41 Table B 8 GSV Data Format
7. r the module engine board will execute a cold start after every turn on To achieve the faster start capacitor should be installed To maximize battery lifetime the battery Voltage should not exceed the supply voltage and should be between 2 5v and 3 6V PBRES Push button reset This pin provides an active low reset input to the engine board It causes the engine board to reset and start searching for satellites SELECT Do not connect TXA This is the main transmits channel for outputting navigation and measurement data to user s navigation software or user written software RXA This is the main receive channel for receiving software commands to the engine board from SiRfdemo software or from user written software Normally this pin must be kept in High and if you don t use this pin please connect a resistor to 3 5V pull high Page 7 of 11 ET 102_data doc VA GlobalSat Wired by Wireless TXB No function as so far Do not connect to enable DGPS navigation synchronized to GPS time Others Do not connect RXB This is the auxiliary receive channel for inputting differential corrections to the engine board Time Mark This pin provides one pulse per second output from the engine board that is GND GND provides the ground for the engine boards Connect all grounds NMEA OUTPUT COMMANDS GGA Global Positioning System Fixed Data Table B 2 contains the values for the following example GPGGA 161
8. s document RMC Recommended Minimum Specific GNSS Data Table B 10 contains the values for the following example GPRMC 161229 487 A 3723 2475 N 12158 3416 W 0 13 309 62 120598 10 Table B 10 RMC Data Format Name Example Units Description Message ID GPRMC RMC protocol header UTC 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 Maanetic Variation degrees E east or W west Checksum 10 lt CR gt lt LF gt End of message termination SiRF Technology Inc does not support magnetic declination All course over ground data are geodetic WGS48 directions VTG Course Over Ground and Ground Speed Table B 10 contains the values for the following example GPVTG 309 62 T M 0 13 N 0 2 K 6E Table B 11 RMC Data Format Name Example Units Description Message ID GPVTG VTG protocol header Page 11 of 13 ET 102_data doc VA GlobalSat Wired by Wireless Course 309 62 degrees Measured heading Reference T True Course dearees Measured heading Reference M Magnetic Speed 0 13 knots Measured horizontal speed Units N Knots Speed 0 2 Km hr Measured horizon
9. tal speed Units K Kilometers per hour Checksum 6E lt CR gt lt LF gt End of message termination All specifications subject to change without notice Page 12 of 13 ET 102_data doc
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