Cayman Systems 2E-H-W Manual de usuario descargar pdf (Pagina 27)

NMEA Manual based on MediaTek chipset - Manual

Please note that with the default NMEA message mask, the 4800 baud rate is not enough in conditions where

there are many tracked satellites. GSV messages might have four lines and exceed the capacity of 4800

bit/second.

$PMTK390,0,1,4800,0,1,0,1,1,1,0,0,0,2,9600*38

and back to default 9600:

$PMTK390,0,1,9600,0,1,0,1,1,1,0,0,0,2,4800*38

Command PMTK390 settings are stored to non-volatile flash memory. It is restricted to allow only 8 setting

changes per module. If exceeding the limit, settings cannot be changed until the module is re-flashed.

This message applies only for MT332X based IT500, IT520 and UP501.

2.36 PMTK740 SET UTC TIME

Command purpose:

Init UTC time. Please do not use local time, which has time-zone offset.

To have faster TTFF, the accuracy of reference UTC should be less than 3 seconds.

Command number: 740

DataField:

PMTK740,YYY,MM,DD,hh,mm,ss*CS<CR><LF>

YYYY: year in 4 digits, range >1980

MM: month, range 1 – 12

DD: day, range 1 – 31

hh: hour, range 0 – 23

mm: minute, range 0 – 59

ss: second, range 0 – 59

CS: Checksum

Example:

$PMTK740,2012,9,28,10,29,00*09<CR><LF>

Reply:

$PMTK001,740,3*33<CR><LF>

This message applies only for MT333X based receivers IT530, IT530M, UC530 and UC530M.

2.37 PMTK741 SET INITIAL POSITION AND TIME

Command purpose:

Initialize position and UTC in cold starts. To have faster TTFF, the accuracy of the location should be better than

30km.

The accuracy of reference UTC should be less than 3 seconds.

Command number: 741

DataField:

PMTK741,Lat,Long,Alt,YYYY,MM,DD,hh,mm,ss*CS<CR><LF>

Lat: WGS84 geodetic latitude. Note: suggest to express this value in floating-point with 6 decimal

points, Minus:south; Plus: north, Range -90.0 ~90.0

Long: WGS84 geodetic longitude. Note: suggest to express this value in floating-point with 6 decimal

points, Minus:west; Plus: east, Range -180.0 ~180.0

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Cayman Systems 2E-H-W Manual de usuario Pagina 27