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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
ET-318
GPS Engine Board
ET-318
Page 1 of 16
USGlobalSat, Inc.
14740 Yorba Court, Chino, CA 91710
Tel: 909.597.8525 / Fax: 909.597.8532
oem@usglobalsat.com
www.usglobalsat.com
Specifications are subject to be changed without notice.
Version 1.3.1
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Summary of Contents for Globalsat ET-318
- Page 1 ET-318 Version 1.3.1 GPS Engine Board ET-318 Globalsat Technology Corporation USGlobalSat, Inc. 16F., No. 186, Jian-Yi Road, Chung-Ho City, Taipei Hsien 235, Taiwan 14740 Yorba Court, Chino, CA 91710 Tel: 886-2-8226-3799/ Fax: 886-2-8226-3899 Tel: 909.597.8525 / Fax: 909.597.8532 service@globalsat.com.tw oem@usglobalsat.com www.globalsat.com.tw...
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Page 2: Product Information
ET-318 Version 1.3.1 Product Information Product Part I.D. ET-318 Product Description: SMT GPS Board Product Features: SiRF StarIII/FLP chipset Very high sensitivity (Tracking Sensitivity: -159 dBm) 20 channels Extremely fast TTFF (Time To First Fix) at low signal levels Compact size... - Page 3 ET-318 Version 1.3.1 Velocity: 0.1 m/s Time: 1us synchronized to GPS time Maximum Altitude 18,000 meter Maximum Velocity 515 meter/second Maximum Acceleration Jerk 20m/sec **3 WGS-84 Default Datum Interface I/O Connector Type External Antenna Port Physical Characteristic Dimensions 0.6” x 0.55” x 0.11” (15.2 x 14 x 2.8 mm)
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Page 4: Technical Information
ET-318 Version 1.3.1 2. Technical Information Pin Assignment ET-318-01 Bottom View Signal Name Description Analog Ground RF_IN GPS Signal input Analog Ground NRESET Reset (Active low) VCC_IN DC Supply Voltage input VBAT Backup voltage supply Serial port B Serial port B... - Page 5 ET-318 Version 1.3.1 Pin Explanation VCC_IN This is the main DC supply for a 3.3V +- 5% DC input power module board. GND provides the ground for digital part. BOOTSEL Set this pin to high for programming flash. This is the main receiver channel and is used to receive software commands to the board from SIRFdemo software or from user written software.
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Page 6: Application Circuit
ET-318 Version 1.3.1 GPIO Functions Several I/Os are connected to the digital interface connector for custom applications. Application Circuit VCC_RF Antenna 50 ohm microstrip line GPIO15 SAW FILTER GPIO15 GPIO13 option RF_IN GPIO13 TIMEMARK TIMEMARK 3.3V GPIO14 RESET NRESET GPIO14... -
Page 7: Mechanical Layout
ET-318 Version 1.3.1 Mechanical Layout Specifications are subject to be changed without notice. Page 7 of 16... -
Page 8: Software Commands
ET-318 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 Example Units Description Message ID $GPGGA GGA protocol header UTC Time 161229.487... - Page 9 ET-318 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 N=north or S=south Longitude 12158.3416 dddmm.mmmm...
- Page 10 ET-318 Version 1.3.1 Table B-6 Mode1 Value Description Manual-forced to operate in 2D or 3D mode 2D automatic-allowed to automatically switch 2D/3D Table B-7 Mode 2 Value Description Fix Not Available GSV-GNSS Satellites in View Table B-8 contains the values for the following example:...
- Page 11 ET-318 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 Time 161229.487 hhmmss.sss Status A=data valid or V=data not valid Latitude 3723.2475...
- Page 12 ET-318 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.
- Page 13 ET-318 Version 1.3.1 <Y> Y coordinate position INT32 <Z> Z coordinate position INT32 <ClkOffset> 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.
- Page 14 ET-318 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.
- Page 15 ET-318 Version 1.3.1 If this is unavailable, a default value of 75000 for GSP1, 95000 for GSP1/LX is used. INT32 <TimeOfWeek> GPS Time Of Week UINT32 <WeekNo> GPS Week Number UINT16 <ChannelCount> Number of channels to use. 1-12 UBYTE <ResetCfg>...
- Page 16 ET-318 Version 1.3.1 181= Tpkyo_Okinawa Checksum <CR><LF> End of message termination * * * Specifications are subject to be changed without notice. Page 16 of 16...
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