Installation - TT-3020C
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Installation - TT-3020C Connectors
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2.5.3.3 NMEA 0183 Transmission
When your Transceiver has a built-in GPS, it sends out NMEA
0183 navigational data to the device connected to the Trans-
ceiver, via the I/O NMEA connector X4.
The following four strings:
VTG Heading and speed information
GLL Geographic position, latitude and longitude
GGAGlobal Positioning System fix data (includes time of position)
ZDA Time and date
are sent out when the Transceiver/GPS is in navigation mode. The
time in the position strings and the Time-and-date string are al-
ways the same. The spacing between each block of data is 2 sec-
onds and 0.5 seconds between GLL, GGA and ZDA strings when
they are present.
An example is:
$GPVTG,000.,T,000.,M,00.0,N,00.0,K
$GPGLL,5544.44,N,01228.64,E,121003,A
$GPGGA,121003,5544.44,N,01228.64,E,1,04,1,37,M,,M,,
$GPZDA,121003,19,02,1993,,
The following three strings: VTG, GLL and GGA are sent out when
the Transceiver/GPS is in acquisition mode and the currently
stored position is less than 24 hours old. The time indicates that
of the last known position. The course and speed are 8 second
mean values.
An example is:
$GPVTG,180.,T,180.,M,01.0,N,00.0,K
$GPGLL,5544.45,N,01228.67,E,121059,
$GPGGA,121059,5544.45,N,01228.67,E,0,00,1,23,M,,M,,
The following three strings: VTG, GLL and GGA are sent out when
the Transceiver/GPS is in acquisition mode and the currently
Document Nr: I-MA-3010.68-5510-762-IVT-312
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