NoLand Engineering, Inc.
N183-41 Serial Multiplexer Installation & Operation Manual
Page 5 of 6
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Great Lakes Marine Specialties
Great Lakes Marine Specialties
Great Lakes Marine Specialties
Great Lakes Marine Specialties
800
800
800
800----821
821
821
821----0207 USA & Canada
0207 USA & Canada
0207 USA & Canada
0207 USA & Canada
952
952
952
952----925
925
925
925----1285 All other Countries
1285 All other Countries
1285 All other Countries
1285 All other Countries
talker
sentence
query
sentence
proprietary
sentence
talker
Sentence
The general format for a talker (instrument) message is:
$ttsss,df1,df2,....[CR][LF]
All messages start with a Dollar sign ($) and are terminated with a Carriage Return/ Line feed
([CR][LF]). Between these are the actual data fields (df1,df2,...) of the messages. The data
fields are separated (delimited) by commas.
The first field always consists of a five character string immediately following the "$" sign and
is termed the address field. The first two characters are termed the talker identifier while the
next three are the sentence identifier. The sentence type identifier defines the remaining data
fields, (i.e., the number of fields and whether they are fixed or variable length).
query
Sentence
A query message is intended to request approved messages to be transmitted from a talker. For
example, a query message might be sent to a GPS receiver to request "DISTANCE-TO-
WAYPOINT" information be transmitted.
The general format of a query message is:
$ttllQ,sss,[CR][LF]
Where the first two characters of the address field are termed the talker identifier of the re-
quester and the next two characters are the talker identifier of the device being queried
(listener). The fifth character is always a "Q" defining the message as a query. The next field
(sss) contains the three letter mnemonic of the sentence being requested.
Proprietary Sentence
Proprietary sentences are those used by manufacturers which are not pre-defined by the stan-
dard.
The general format of a proprietary message is
$Pmmm,df1,df2,...,[CR][LF]
Where the "P" indicates that it is a proprietary message and that the data fields which follow do
not necessarily correspond to any approved sentence structure. The "mmm" is defined as the
manufacturers message code.
For more information, see the NMEA 0183 Description.
