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A NMEA-0183 Output
118 SPSx51 Modular GPS Receivers User Guide
NMEA-0183 message overview
When NMEA-0183 output is enabled, a subset of NMEA-0183 messages can be output
to external instruments and equipment connected to the receiver serial ports. These
NMEA-0183 messages let external devices use selected data collected or computed by
the GPS receiver.
All messages conform to the NMEA-0183 version 3.01 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 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.
The following table summarizes the set of NMEA messages supported by the receiver,
and shows the page that contains detailed information about each message.
To enable or disable the output of individual NMEA messages, do one of the following:
• Create an application file in the GPS Configurator software that contains NMEA
output settings and then send the file to the receiver.
• Add NMEA outputs in the Serial outputs tab of the GPS Configurator software
and then apply the settings. (You cannot use the GPS Configuration software to
load application files to the SPSx51 Modular GPS receivers.)
• For SPSx51 Modular GPS receivers, set up the NMEA output using the keypad
and display or a web browser.
Message Function Page
GGA Time, position, and fix related data 120
GSA GPS DOP and active satellites 121
GST Position error statistics 122
GSV Number of SVs in view, PRN, elevation, azimuth, and SNR 123
HDT Heading from True North 124
PTNL,AVR Time, yaw, tilt, range, mode, PDOP, and number of SVs for
Moving Baseline RTK
125
PTNL, BPQ Base station position and position quality indicator 126
PTNL,GGK Time, position, position type and DOP values 127
PTNL,PJK Local coordinate position output 128
PTNL,VGK Time, locator vector, type and DOP values 129
PTNL,VHD Heading Information 130
RMC Position, Velocity, and Time 131
ROT Rate of turn 132
VTG Actual track made good and speed over ground 133
ZDA UTC day, month, and year, and local time zone offset 134