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EM-408

                                                                                           

 

Specifications are subject to be changed without notice. 

Page 13 of 14 

 

Version 1.4.1 

            <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 
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 

 
 
 

 

Содержание EM-408

Страница 1: ...408 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...

Страница 2: ...Sensitivity 159dBm Extremely fast TTFF Time To First Fix at low signal levels Supports the NMEA 0183 data protocol Built in SuperCap to maintain system data for rapid satellite acquisition Built in pa...

Страница 3: ...ed Velocity 0 1 ms Time 1 s synchronized to GPS time Maximum Altitude 18 000 meters 60 000 feet max Maximum Velocity 515 meter second 1000 knots max Maximum Acceleration 4G Datum WGS 84 Jerk Limit 20m...

Страница 4: ...EM 408 Specifications are subject to be changed without notice Page 4 of 14 Version 1 4 1 2 Technical Information Physical Characteristics...

Страница 5: ...t data to user s _ navigation software or user written software RX This is the main receive channel for receiving software commands to the engine board from SiRfDemo software or from user written soft...

Страница 6: ...29 487 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 d...

Страница 7: ...ude 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 UTC Position 161229 487 hhmmss sss Status A A data valid or V data not valid...

Страница 8: ...15 12 041 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 Sa...

Страница 9: ...und 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 Inc does not support magnetic declination All cours...

Страница 10: ...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...

Страница 11: ...t using known position and time PSRF101 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 in...

Страница 12: ...ecksum enabled PSRF103 05 00 01 01 20 Example 3 Disable VTG message PSRF103 05 00 00 01 21 E LLA Navigation initialization ID 104 Parameters required to start using Lat Lon Alt This command is used to...

Страница 13: ...ed 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 p...

Страница 14: ...without notice Page 14 of 14 Version 1 4 1 Name Example Units Description Message ID PSRF106 PSRF106 protocol header Datum 178 21 WGS84 178 Tokyo_Mean 179 Tokyo_Japan 180 Tokyo_Korea 181 Tpkyo_Okinaw...

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