Simrad TV80, Reference Manual

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273
About NMEA and standard datagram formats
Topics
About the NMEA datagram formats, page 273
National Marine Electronics Association (NMEA), page 273
NMEA sentence structure, page 274
Standard NMEA 0183 communication parameters, page 275
About the NMEA datagram formats
The TV80 can send and receive information to and from several different peripherals. All
transmissions take place as
datagrams
with data sentences. Each datagram has a defined
format and length.
The NMEA 0183 standard is the most common protocol used to receive and transmit data to
and from peripheral sensors. A parametric sentence structure is used for all NMEA data.
The sentence start with a “$” delimiter, and represent the majority of approved sentences
defined by the standard. This sentence structure, with delimited and defined data files, is the
preferred method for conveying information.
For more information about the NMEA standard, the format and the data sentences, refer
to their official publications. Their document
NMEA 1083 - Standard for interfacing
marine electronic devices explains the formats in detail. The document can be obtained
from NMEA.
Note
Two phrases are in general use to describe basic transfer unit associated with a
packet-switched network; "telegram" and "datagram". In this publication, we use the
phrase "datagram".
National Marine Electronics Association (NMEA)
The National Marine Electronics Association (NMEA) has defined communication standards
for maritime electronic equipment, and the TV80 Catch monitoring software supports these
standards for communication with external sensors and peripheral systems.
The most common standard is the NMEA 0183. The National Marine Electronics
Association describes it as follows:
Datagram formats