MP880W Modem User Guide
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.
GPS protocols and commands
The GPS module supports two methods of reporting naviga‐ tional information, using either the TAIP (Trimble ASCII Interface Protocol) or NMEA (National Marine Electronics Association) protocols. The GPS module is pre‐configured for TAIP. If you are using a GPS application that requires data to be reported according to the NMEA protocol, the MP modem must be reconfigured using an AT command. (See the MP 3G Modems AT Command Reference manual (document #2130810.)
NMEA is a reporting protocol only, while TAIP provides the ability to send commands to the module to query for infor‐ mation and configure reports. When the MP modem is set for TAIP, commands can be sent to the MP modem in these ways:
•Using 3G Watcher
•Using AT commands
TAIP commands can be used to:
•Query the MP modem for its current position, heading, and speed
•Enable and disable automatic reporting of GPS data, and set the interval at which automatic reports are sent
•Configure the format of reports
GPS display in 3G Watcher
To view 3G Watcher’s GPS Display window, which reports latitude, longitude, speed, direction, altitude, and local and UTC time1, select Tools > Display GPS or double‐click the GPS icon on the main 3G Watcher window.
From a cold start (where the MP modem is powered on with no stored navigational data), it may take up to 39 seconds for the GPS module to obtain satellite fixes and begin reporting.
1.UTC replaces Greenwich Mean Time as the basis for standard time throughout the world. UTC, which uses atomic measurements rather than the Earth’s rotation, is the equivalent of mean solar time at the prime meridian (0° longitude).
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