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12 NMEA-0183 Output
126 5700 GPS Receiver User Guide
Reference
12.1Introduction
This chapter describes the formats of the subset of NMEA-0183
messages that are available for output by the 5700 receiver. For a copy
of the NMEA-0183 Standard, visit the National Marine Electronics
Association web site at www.nmea.org.
12.2NMEA-0183 Outputs
When NMEA-0183 output is enabled, a subset of NMEA-0183
messages can be output to external instruments and equipment
connected to the 5700 serial ports. These NMEA-0183 messages let
external devices use selected data collected or computed by the 5700
receiver.
All messages conform to the NMEA-0183 Version 2.30 format. All
begin with $ and end with a carriage return and a line feed. Data fields
follow comma (,) delimiters and are variable in length. Null fields still
follow comma (,) delimiters but contain no information.
An asterisk (
*) delimiter and checksum value follow the last field of
data contained in an NMEA-0183 message. The checksum is the 8-bit
exclusive OR of all characters in the message, including the commas
between fields, but not including the $ and asterisk delimiters. The
hexadecimal result is converted to two ASCII characters (0–9, A–F).
The most significant character appears first.