Maretron USB100 Manuel d'utilisateur télécharger pdf (Page 21)

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NMEA 2000 and NMEA 0183 comparison

Products

In NMEA 2000:

In NMEA 0183:

A binary encoded message structure

is used, using “PGNs”, which identify

for data packets sent over the bus

NMEA 0183 is an ASCII “Text” based

standard using formatters and talker ids

Baud rate is

250,000 bits/s

Baud rate is

4800 or 38400 bps

All devices have electrically isolated

interface circuitry

There are many legacy devices without

isolated

interfaces

ata can be sent from any node – all

data is shared on the bus

Data is transmitted from

Talkers- Only one

Talker

is allowed on a data connection

The bus itself is the multiplexer

combine data from multiple talkers

together, a

multiplexer must be used to

concentrate the data

ata can be received by any node -

all

data receivers can see all data

providers

Data is received by

Listeners

An NMEA 0183 data connection can have

multiple

Listeners

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Maretron USB100 Manuel d'utilisateur Page 21