LT-1000 User & Installation Manual
App. D - NMEA 0183 Sentences
Lars Thrane A/S
www.thrane.eu
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GNSS Talker Identifier
The first two characters in the address field of an NMEA 0183 sentence is the Talker Identifier (e.g. “HC” in
the address field “HCHDG”). The Talker Identifier may be used to determine the source of a sentence, when
it can have multiple sources. In case of the GNSS related sentences (DTM, GGA, GLL, GSA, GSV, RMC, VTG,
ZDA), the Talker Identifier can be used to determine from which specific GNSS system the data originates:
GN Talker Identifier is a special case that indicates the sentence data originates from multiple GNSS systems.
This is the case when the LT-1000 is configured (see GNSS satellite receiver configuration on page 31) to use
multiple GNSS systems: GPS + GLONASS or GPS + BeiDou.
The GSV sentence will never be sent with Talker Identifier GN as it will ever only contain data from one GNSS
system. If the LT-1000 NRU is configured to use multiple GNSS systems, the GSV sentence will be repeated
for each GNSS system and the Talker Identifier of each GSV sentence will indicate the specific GNSS system
to which it applies.
MDA
The Meteorological Composite (MDA) sentence can convey more information about the environment than
the LT-1000 NRU supports. In compliance with the NMEA 0183 standard, data fields for which LT-1000 NRU
has no data will be null fields.
Here is an example of an MDA sentence outputted from an LT-1000 NRU containing air pressure and air
temperature:
$WIMDA,29.29,I,0.9918,B,19.8,C,,C,,,,C,,T,,M,,N,,M*23
XDR
The XDR sentence Transducer ID field is not standardized by the NMEA 0183 standard and is thus
proprietary. Lars Thrane A/S has defined the following proprietary Transducer IDs:
Here is an example of an XDR sentence outputted from an LT-1000 NRU containing air pressure and air
temperature:
$WIXDR,P,99178,P,ATMO,C,19.8,C,TEMP*6B
GNSS Talker Identifier
Talker Identifier
GNSS Type
GB
BeiDou
GL
GLONASS
GN
Multiple GNSS’
GP
GPS, SBAS, or QZSS
T
ABLE
7:
GNSS
T
ALKER
I
DENTIFIER
XDR Proprietary Transducer ID’s
Transducer ID
Transducer
Unit
ATMO
Pressure (P)
Pascal (P)
TEMP
Temperature (C) Celcius (C)
T
ABLE
8:
XDR
T
RANSDUCER
ID’
S
Summary of Contents for LT-1000 NRU
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