Globalsat ET-312 User Manual Download Page 1

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ET-312

Page 1 of 21

Version 1.4

GPS Engine Board ET-312

Version 1.4

01/20/2010

Globalsat Technology Corporation Headquarters (Far East Century Park)

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 :

Website:

www.globalsat.com.tw

Summary of Contents for ET-312

Page 1: ...Version 1 4 01 20 2010 Globalsat Technology Corporation Headquarters Far East Century Park 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...

Page 2: ...ing Fleet management Mobile phone navigation Marine navigation Product Features SiRF star III high performance GPS Chipset Very high sensitivity Tracking Sensitivity 159 dBm Extremely fast TTFF Time T...

Page 3: ...WAAS enabled Velocity 0 1 m s Time 1us synchronized to GPS time Maximum Altitude 18 000 meter Maximum Velocity 515 meter second Maximum Acceleration 4G Update Rate 1 Hz DGPS WAAS EGNOS MSAS Datum WGS...

Page 4: ...nna While external antenna is used the optional power is needed 3 GND Ground 4 GND Ground 5 GND Ground 6 GND Ground 7 VIN This is the main DC supply for a 3 3V 5 DC input power module board 8 BATTERY...

Page 5: ...al function For example on off LED 10 TX This is the main transmits channel for outputting navigation and measurement data to user s navigation software or user written software Output TTL level 0V 2...

Page 6: ...07 GlobalSat Technology Page 6 of 21 Version 1 4 Application Circuit GPS Active Antenna Specification Recommendation Frequency 1575 42 2 MHz Axial Ratio 3 dB Typical output Impedance 50 Polarization R...

Page 9: ...of 21 Version 1 4 Recommended Reflow Profile Pre heating temperature 150 10 Pre heating time 90 30 sec Heating temperature 235 5 Heating time 10 1 sec Peak temperature must not exceed 240 and the dur...

Page 10: ...dicator 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 Altitude1 9 0 meters Units M meters Geoid Separation1 m...

Page 11: ...e 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...

Page 12: ...NR C No 42 dBHz Range 0 to 99 null when not tracking Checksum 71 CR LF End of message termination Depending on the number of satellites tracked multiple messages of GSV data may be required RMC Recomm...

Page 13: ...ommand 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 bit...

Page 14: ...cant character is transmitted first CR LF Hex 0D 0A B Navigation lnitialization ID 101 Parameters required for start This command is used to initialize the module for a warm start by providing current...

Page 15: ...000 for GSP1 95000 for GSP 1 LX will be used INT32 TimeOf Week GPS Time Of Week UINT32 WeekNo GPS Week Number UINT16 Week No and Time Of Week calculation from UTC time chnlCount Number of channels to...

Page 16: ...corrections Differential receivers may output corrections using different communication parameters The default communication parameters for PORT B are 9600 Baud 8data bits 0 stop bits and no parity If...

Page 17: ...MC 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 m...

Page 18: ...ing 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 ini...

Page 19: ...ich Float possibly signed Alt Altitude position float possibly signed ClkOffset Clock Offset of the receiver in Hz use 0 for last saved value if available If this is unavailable a default value of 750...

Page 20: ...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 pre...

Page 21: ...7 GlobalSat Technology Page 21 of 21 Version 1 4 worldwide common 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 t...