TW5210 User Manual rev 1_2
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©2011 Tallysman Wireless, Inc.
Confidential
8
NMEA Message Reference
NMEA 0183 sentences are all ASCII. Each sentence begins with a dollar sign ($) and ends
with a carriage return linefeed (<CR><LF>). Data is comma delimited. A checksum is
optionally added.
The following format indicate 5 digit RMC and GGA outputs.
8.1
NMEA Field Types
NMEA message fields have the following format:
Status:
A
Yes/Data valid
V
No/Data invalid
‡ Latitude:
llll.lllll
ddmm.mmmmm
‡ Longitude:
yyyyy.yyyyyy
dddmm.mmmmm
Time:
hhmmmsslss
HoursMinutesSeconds.decimalSeconds
Defined Fields:
Predefined Constants, most often alpha characters
Numeric Numbers: x.x
Digit.decimalDigit
Fixed Hex Fields
hh__
MSB to the left
Information fields:
c---c Variable length Character fields
aa__Fixed Length alpha fields
xx__Fixed Length numeric characters
