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C-2 Acutime 2000 Synchronization Kit User Guide
NMEA 0183
C
C.1 The NMEA 0183 Communication Interface
NMEA 0183 allows a single source (talker) to transmit serial data
over a single twisted wire pair to one or more receivers (listeners).
The table below lists the characteristics of the NMEA 0183 data
transmissions.
C.2 NMEA 0183 Message Format
The NMEA 0183 protocol covers a broad array of navigation data.
This broad array of information is separated into discrete messages,
which convey a specific set of information. The entire protocol
encompasses over 50 messages, but only a sub-set of these messages
apply to a GPS receiver like the Acutime 2000. The NMEA message
structure is described below.
$IDMSG,D1,D2,D3,D4,.......,Dn*CS[CR][LF]
“$” The “$” signifies the start of a message.
ID The talker identification is a two-letter mnemonic
that describes the source of the navigation
information. The GP identification signifies a GPS
source.
MSG The message identification is a three-letter
mnemonic that describes the message content and the
number and order of the data fields.
“,” Commas serve as delimiters for the data fields.
Table C-1 NMEA 0183 Characteristics
Signal Characteristic NMEA Standard
Baud Rate 4800
Data Bits 8
Parity None (Disabled)
Stop Bits 1