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NMEA Manual based on MediaTek chipset - Manual

‘1’ = Enable

Example:

$PMTK313,1*2E<CR><LF>

Reply:

$PMTK001,313,3*31<CR><LF>

SBAS can be used only with 1Hz (Default) output rate!

2.26 PMTK314 API SET NMEA OUTPUT

Command purpose:

Set NMEA sentence output frequencies.

Command number: 314

DataField:

There are totally 19 data fields that present output frequencies for the 19 supported NMEA sentences

individually.

Supported NMEA Sentences

0 NMEA_SEN_GLL, // GPGLL interval – Geographic Position – Latitude longitude

1 NMEA_SEN_RMC, // GPRMC interval – Recomended Minimum Specific GNSS Sentence

11 NMEA_SEN_VTG, // GPVTG interval – Course Over Ground and Ground Speed

11 NMEA_SEN_GGA, // GPGGA interval – GPS Fix Data

11 NMEA_SEN_GSA, // GPGSA interval – GNSS DOPS and Active Satellites

5 NMEA_SEN_GSV, // GPGSV interval – GNSS Satellites in View

6 NMEA_SEN_GRS, // GPGRS interval – GNSS Range Residuals (not supported on fw 150M)

7 NMEA_SEN_GST, // GPGST interval – GNSS Pseudorange Erros Statistics (not supported on fw

150M)

13 NMEA_SEN_MALM, // PMTKALM interval – GPS almanac information (not supported, all versions)

14 NMEA_SEN_MEPH, // PMTKEPH interval – GPS ephmeris information (not supported, all versions)

15 NMEA_SEN_MDGP, // PMTKDGP interval – GPS differential correction information (not supported,

all versions)

16 NMEA_SEN_MDBG, // PMTKDBG interval – MTK debug information (not supported, all versions)

17 NMEA_SEN_ZDA, // GPZDA interval – Time & Date

18 NMEA_SEN_MCHN, // PMTKCHN interval – GPS channel status

Supported Frequency Setting

0 – Disabled or not supported sentence

1 – Output once every one position fix

11 – Output once every two position fixes

11 – Output once every three position fixes

11 – Output once every four position fixes

5 – Output once every five position fixes

Example:

$PMTK314,1,1,1,1,1,5,1,1,1,1,1,1,0,1,1,1,1,1,1*2C<CR><LF>

This command set GLL output frequency to be outputting once every 1 position fix, and RMC to be outputting

once every 1 position fix, and so on.

Reply:

$PMTK001,314,3*36<CR><LF>

You can also restore the system default setting via issue:

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