NMEA Manual based on MediaTek chipset - Manual
FTX-HW-13002-A
Preliminary
Page 25 of 39
Reply:
$PMTK001,386,3*3D<CR><LF>
This message applies only for MT333X based receivers IT530, IT530M, UC530 and UC530M.
2.34
PMTK397 API SET STATIC NAV THD MT332X
Command purpose:
Set the speed threshold for static navigation. If the actual speed is below the threshold, output position will keep
the same and output speed will be zero. If threshold value is set to 0, this function is disabled.
Command number:
397
DataField:
PMTK397,speed_threshold
speed_threshold: 0=disable; >0 = speed threshold in m/s
Example:
$PMTK397,0.7*3A<CR><LF>
Reply:
$PMTK001,337,3*3D<CR><LF>
This message applies only for MT332X based IT500, IT520 and UP501.
2.35
PMTK390 API SET USER OPTION
Command purpose:
Change default settings of the NMEA output permanently. Write the user setting to the flash to override the
default setting. Maximum 8 times without erase the chip.
Command number:
390
DataField:
PMTK390, Lock, Update_Rate, Baud_Rate, GLL_Period, RMC_Period, VTG_Period, GSA_Period, GSV_Period,
GGA_Period, ZDA_Period, MCHN_Period, Datum, DGPS_Mode, RTCM_Baud_Rate
Lock: nonzero: freeze the setting; 0: allow further setting.
Update_Rate: 1~5 (Hz)
Baud_Rate: 115200, 57600, 38400, 19200, 14400, 9600, 4800
RTCM_Baud_Rate: 115200, 57600, 38400, 19200, 14400, 9600, 4800
XXX_Period: NMEA sentence output period
DGPS_Mode: 0 (disable), 1 (RTCM), 2 (SBAS)
Datum: We support more than 200 datum. Please refer to Appendix A for the supported datum list.
The typical value is: 0 (WGS84), 1 (Tokyo-M), 2 (Tokyo-A)
Example:
$PMTK390,0,1,38400,1,1,1,1,1,1,1,0,0,2,9600*0A<CR><LF>
Reply:
$PMTK001,390,3
Keep the lockbit zero. If you enable lockbit, you might corrupt the firmware!
This message applies only for MT332X based IT500, IT520 and UP501.
