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MP875 Modem User Guide
56 2130808
GPS protocols and commands
Note: The “MP 3G Modems
TAIP Reference manual”
(document #2130312) provides
a description of the TAIP
commands that can be used with
the MP modem. This is available
at
www.sierrawireless.com.
Information about Trimble GPS
modules, including more
documentation on TAIP
commands, is available at
www.trimble.com.
More information on NMEA
message standards is available
at www.nmea.org.
TheGPSmodulesupportstwomethodsofreportingnaviga‐
tionalinformation,usingeithertheTAIP(Tri mbleASCII
InterfaceProtocol)orNMEA(NationalMarineElectronics
Association)protocols.TheGPSmoduleispre‐configuredfor
TAIP .IfyouareusingaGPSapplicationthatrequiresdatato
bereportedaccordingtotheNMEAprotocol,theMPmodem
mustbereconfiguredusingan
ATcommand.(SeetheMP3G
ModemsATCommandReferencemanual(document#2130810.)
NMEAisareportingprotocolonly,whileTAIPprovidesthe
abilitytosendcommandstothemoduletoqueryforinfor
‐
mationandconfigurereports.WhentheMPmodemissetfor
TAIP ,commandscanbesenttotheMPmodemintheseways:
• Using3GWatcher
• UsingATcommands
TAIPcommandscanbeusedto:
• QuerytheMPmodemforitscurrentposition,heading,
andspeed
• Enableanddisableau tomaticreportingofGPSdata,and
settheintervalatwhichautomaticreportsaresent
• Configuretheformatofreports
GPS display in 3G Watcher
Toview3GWatcher’ sGPSDisplaywindow,whichreports
latitude,longitude,speed,direction,altitude,andlocaland
UTCtime
1
,selectTools > Display GPSordouble‐clicktheGPS
icononthemain3GWatcherwindow.
Fromacoldstart(wheretheMPmodemispoweredonwith
nostorednavigationaldata),itmaytakeupto39secondsfor
theGPSmoduletoobtainsatellitefixesandbeginreporting.
1. UTCreplacesGreenwichMeanTimeasthebasisfor
standardtimethroughouttheworld.UTC,whichuses
atomicmeasurementsratherthantheEarth’srotation,is
theequivalentofmeansolartimeattheprimemeridian
(0°longitude).