ET-333 Version 1.3.1 GPS Engine Board ET-333 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 service@globalsat.com.tw www.globalsat.com.tw USGlobalSat, Inc. 1308 John Reed Court, City of Industry, CA 91745 Tel: 626-968-4145 / Fax: 626-968-4373 oem@usglobalsat.com www.usglobalsat.com Specifications are subject to be changed without notice.
ET-333 Version 1.3.1 1. Product Information Product Part I.D. ET-333 Product Description: The ET-333 GPS engine board is low cost but maintains high reliability and accuracy making it an ideal choice for integration with OEM/ODM systems.
ET-333 Cold Start 42 seconds average Warm Start 38 seconds average Hot Start 1 second average Reacquisition 0.1 second average Accuracy Version 1.3.1 Position: 15 meters, 2D RMS 10 meters, 2D RMS, WAAS enabled Velocity: 0.
ET-333 Version 1.3.1 2. Technical Information Physical Characteristics Specifications are subject to be changed without notice.
ET-333 Version 1.3.1 Pin Assignment 1 2 3 4 5 6 7 8 9 10 11 12 GND VBAT VDC PBRES GP101 TX RX GND GND SELECT TIMEMARK GND Ground 3.8~6.5 DC power input (Input) Backup Battery (Input) 3.3~5.5 DC power input (Input) Push Button Reset Input (Active Low) (Input) Special function Serial Data Output (GPS Data)(Output) Serial Data Input (Command) Ground Ground (Reserved) 1PPS Time Mark Output Ground Specifications are subject to be changed without notice.
ET-333 Version 1.3.1 Pin Explanation GND: GND provides the ground for the engine boards. Be sure to connect all grounds VBAT (Backup Battery) This is the battery backup that powers the SRAM and RTC when main power is removed. Typical current draw is 10uA. Without an external backup battery or Gold-capacitor, the module/engine board will execute a cold start after every turn on. To achieve the faster start, a battery or capacitor should be installed.
ET-333 Version 1.3.1 3. Software Commands NMEA Output Command GGA-Global Positioning System Fixed Data 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,,,,0000*18 Table B-2 GGA Data Format Name Message ID Example $GPGGA Units Description GGA protocol header UTC Time 161229.487 hhmmss.sss Latitude N/S Indicator 3723.2475 N ddmm.mmmm N=north or S=south Longitude 12158.3416 dddmm.
ET-333 Version 1.3.1 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 Longitude n 12158.3416 N=north or S=south dddmm.mmmm E/W Indicator W E=east or W=west UTC Position Status 161229.487 A hhmmss.
ET-333 Version 1.3.
ET-333 Version 1.3.1 RMC-Recommended Minimum Specific GNSS Data 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,,*10 Table B-9 RMC Data Format Name Example Units Description Message ID $GPRMC RMC protocol header UTC 161229.487 hhmmss.sss Status Latitude A 3723.2475 A=data valid or V=data not valid ddmm.mmmm N/S Indicator N N=north or S=south Longitude E/W Indicator 12158.3416 W dddmm.
ET-333 Version 1.3.1 ■ 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 is utilize to switch the GPS module back to SiRF Binary protocol mode, where an extensive message commands are readily available.
ET-333 Version 1.3.1 Y coordinate position INT32 Z coordinate position INT32 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 is used. INT32 GPS Time Of Week UINT32 GPS Week Number UINT16 Week No and Time Of Week calculation from UTC time Number of channels to use.1-12.
ET-333 Version 1.3.1 This command is used to control standard NMEA data output messages: GGA, GLL, GSA, GSV, RMC, and VTG. Using this command message, standard NMEA message is polled once, or setup for periodic output. In addition, checksums may also be enable or disable contingent on receiving program requirements. NMEA message settings are stored in a battery-backed memory for each entry when the message is accepted.
ET-333 Version 1.3.1 If this is unavailable, a default value of 75000 for GSP1, 95000 for GSP1/LX is used. INT32 GPS Time Of Week UINT32 GPS Week Number UINT16 Number of channels to use. 1-12 UBYTE bit mask 0×01=Data Valid warm/hot starts=1 0×02=clear ephemeris warm start=1 0×04=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.
ET-333 Name Example Units Version 1.3.1 Description Message ID $PSRF106 PSRF106 protocol header Datum 178 21= WGS84 178= Tokyo_Mean 179= Tokyo_Japan 180= Tokyo_Korea 181= Tpkyo_Okinawa Checksum *32 End of message termination * * * Specifications are subject to be changed without notice.
