Cayman Systems 2E-H-W Instrukcja Użytkownika Pobierz pdf (Strona 23)

NMEA Manual based on MediaTek chipset - Manual

$PMTK314,-1*04<CR><LF>

Messages ALM, EPH, DGB and DBG are not currently supported.

Messages GRS, GST, ZDA and MCHN are not supported on 150M firmware.

2.27 PMTK330 API SET DATUM

Command purpose:

Set default datum.

Command number: 330

DataField:

PMTK330,Datum

Datum: 0: WGS84

1: TOKYO-M

2: TOKYO-A

Support 219 different datums. The total datums list in Appendix A.

Example:

$PMTK330,0*2E<CR><LF>

Reply:

$PMTK001,330,3*30<CR><LF>

2.28 PMTK331 API SET DATUM ADVANCE

Command purpose:

Set user defined datum.

Command number: 331

DataField:

PMTK331,majA,ecc,dX,dY,dZ

majA: User defined datum semi-major axis [m]

ecc: User defined datumeccentric [m]

dX: User defined datum to WGS84 X axis offset [m]

dY: User defined datum to WGS84 X axis offset [m]

dZ: User defined datum to WGS84 X axis offset [m]

Example:

$PMTK331, 6377397.155, 299.1528128, -148.0, 507.0,685.0*16<CR><LF>

Reply:

$PMTK001,331,3*31<CR><LF>

2.29 PMTK335 API SET RTC TIME

Command purpose:

This command sets RTC UTC time.

The command doesn’t update the GPS time, which is maintained by GPS receiver. After setting, the RTC

UTC time finally may be updated by GPS receiver with more accurate time after 60 seconds.

Command number: 335

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