User's Manual

A NMEA-0183 Output
114 SPSx50 Modular GPS Receiver 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 where detailed information about each message can be found.
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 applications files to the SPSx50 Modular GPS receivers.)
• For SPSx50 Modular GPS receivers, set up the NMEA output using the keypad
and display or a web browser.
Message Function Page
ADV Position and Satellite information for RTK network operations 116
GGA Time, position, and fix related data 117
GSA GNSS DOP and active satellites 118
GST Position error statistics 119
GSV Number of SVs in view, PRN, elevation, azimuth, and SNR 120
HDT Heading from True North 121
PTNL,AVR Time, yaw, tilt, range, mode, PDOP, and number of SVs for
Moving Baseline RTK
122
PTNL,GGK Time, position, position type and DOP values 123
PTNL,GGK_SYNC Time, synchronized position, position type and DOP values 124
PTNL,PJK Local coordinate position output 125
PTNL,VGK Time, locator vector, type and DOP values 126
PTNL,VHD Heading Information 127
RMC Position, Velocity, and Time 128
ROT Rate of turn 129
VTG Actual track made good and speed over ground 130
ZDA UTC day, month, and year, and local time zone offset 131