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ET-318

                                                                                                       

 

Specifications are subject to be changed without notice. 

Page 15 of 16 

 

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>      

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.) Development Data On/Off ID:105      Switch Development Data Messages On/Off 

 

 

Use this command to enable development debug information if you are having trouble in attaining 
commands accepted. Invalid commands will generate debug information that should enable the    user   
to determine the source of the command rejection. Common input rejection problems are associated 
to invalid checksum or parameter out of specified range. Note, this setting is not preserved across a 
module reset. 

 
Format:  $PSRF105,<debug>*CKSUM<CR><LF> 
 

<debug>    

         

0=Off,1=On 

 

Example: Debug On       

$PSRF105,1*3E 

 

Example: Debug Off       

$PSRF105,0*3F 

 

G). Select Datum ID:106    Selection of datum to be used for coordinate transformations 

  GPS receivers perform initial position and velocity calculations using an earth-centered earth-fixed 

(ECEF) coordinate system. Results may be converted to an earth model (geoid) defined by the 
selected datum. The default datum is WGS 84 (World Geodetic System 1984) which provides a 
worldwide common grid system that may be translated into local coordinate systems or map Datum. 
(Local map Datum are a best fit to the local shape of the earth and not valid worldwide.)   

 

Examples:  
Datum select TOKYO_MEAN 
$PSRF106,178*32 
 

Name  

Example 

Units 

Description 

Message ID 

$PSRF106 

 

PSRF106 protocol header 

Datum 178 

 

21= 

 

WGS84 

178= Tokyo_Mean 
179= Tokyo_Japan 
180= Tokyo_Korea 

Summary of Contents for ET-318

Page 1: ...318 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 In...

Page 2: ...One size component easy to mount on another PCB board 9 Support NMEA 0183 and SiRF binary protocol Product Specifications GPS Receiver Chipset SiRF StarIII FLP Frequency L1 1575 42 MHz Code 1 023 MHz...

Page 3: ...mensions 0 6 x 0 55 x 0 11 15 2 x 14 x 2 8 mm DC Characteristics Power Supply 3 3V 5 DC Input Power Consumption 42mA Continuous Mode 25mA Trickle Mode Environmental Range Humidity Range 5 to 95 non co...

Page 4: ...g Ground 4 NRESET I Reset Active low 5 VCC_IN PWR DC Supply Voltage input 6 VBAT PWR Backup voltage supply 7 RXB I Serial port B 8 TXB O Serial port B 9 GND G Analog Ground 10 BOOTSEL Boot mode 11 TXA...

Page 5: ...ristics of the signal the design has to certain criteria The line on the PCB from the antenna or antenna connector has to be a controlled microstrip line at 50 PPS This pin provides one pulse per seco...

Page 6: ...Application Circuit R46 560R 1 2 C1 1U 1 2 TXA RXB RESET BATTERY GPIO15 50 ohm microstrip line GPIO13 RXA R5 SAW FILTER 1 2 U1 GPS 6 5 4 3 2 1 7 8 9 10 11 12 13 14 15 17 16 VBAT VCC_IN NRESET GND RF_...

Page 7: ...ET 318 Specifications are subject to be changed without notice Page 7 of 16 Version 1 3 1 Mechanical Layout...

Page 8: ...north or S south Longitude 12158 3416 dddmm mmmm E W Indicator 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...

Page 9: ...9 487 hhmmss sss Status A A data valid or V data not valid Checksum 2C CR LF End of message termination GSA GNSS DOP and Active Satellites Table B 5 contains the values for the following example GPGSA...

Page 10: ...41 42 41 Table B 8 GSV Data Format Name Example Units Description Message ID GPGSV GSV protocol header Number of Messages1 2 Range 1 to 3 Message Number1 1 Range 1 to 3 Satellites in View 07 Satellite...

Page 11: ...west Speed Over Ground 0 13 knots Course Over Ground 309 62 degrees True Date 120598 ddmmyy Magnetic Variation2 degrees E east or W west Checksum 10 CR LF End of message termination SiRF Technology I...

Page 12: ...1 PSRF100 0 9600 8 1 0 0C CR LF Example 2 Switch to User1 protocol at 38400 8 N 1 PSRF100 4 38400 8 1 0 38 CR LF Checksum Field The absolute value calculated by exclusive OR the 8 data bits of each ch...

Page 13: ...2686700 4304200 3851624 96000 497260 921 12 3 7F C Set DGPS Port ID 102 Set PORT B parameters for DGPS input This command is used to control Serial Port B an input serial only port used to receive RTC...

Page 14: ...00 01 21 E LLA Navigation initialization ID 104 Parameters required to start using Lat Lon Alt This command is used to initialize the GPS module for a Warm start providing real time position Latitude...

Page 15: ...mmand rejection Common input rejection problems are associated to invalid checksum or parameter out of specified range Note this setting is not preserved across a module reset Format PSRF105 debug CKS...

Page 16: ...ET 318 Specifications are subject to be changed without notice Page 16 of 16 Version 1 3 1 181 Tpkyo_Okinawa Checksum 32 CR LF End of message termination...

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