Reference Information
LD8 Operations Manual
AB- V-MA-00635_RevA6
31
5.2 LD8 Output Sentences
This section outlines the message structure of the following message output types:
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•
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•
•
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•
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GRS
•
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5.3 NMEA Talker IDs
The NMEA talker identif ier serves to define the nature of the data being transmitted. The talker is the f irst 2
characters after the $ sign within the NMEA sentence. As the LD8 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:
Talker ID
Constellation
GP
GPS
GL
GLONASS
GA
Galileo
BD
BeiDou
GQ
QZSS
GN
Multiple Constellations