Reference Information
LD900 Installation and Oper ations M anual
66
6.4 LD900 Output Sentences
This section outlines the message structure of the following message output types:
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6.4.1 NMEA Talker IDs
The NMEA talker identifier serves to define the nature of the data being transmitted. The talker is the first 2
characters after the $ sign within the NMEA sentence. As the LD900 is capable of utilising more than only the
GPS constellation, the talker has a set value for each constellation. For sentences where the data relates to
multiple constellations, the ID ‘
GN
’ will be found.
Not all NMEA sentences will have a variable talker ID (the GGA and ZDA will be fixed with
GP
) however all
other NMEA messages will have a variable talker. Note that the talker ID is determined by the constellation/s in
use and cannot be changed to another value.
The table below shows the talker IDs and the represented constellation/state:
Talker ID
Constellation
GP
GPS
GL
GLONASS
GA
Galileo
BD
BeiDou
GQ
QZSS
GN
Multiple Constellations
IN
Dead Reckoning
