u-blox ZED-F9P Interface Description - Manual
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Interface Description
4 NMEA Protocol
4.1 Protocol Overview
4.1.1 Message Format
NMEA messages sent by the GNSS receiver are based on NMEA 0183 Version 4.1. The following picture shows
the structure of a NMEA protocol message.
For further information on the NMEA Standard, refer to
NMEA 0183 Standard For Interfacing Marine Electronic
Devices
, Version 4.10, June, 2012. See
for ordering instructions.
The NMEA standard allows for proprietary, manufacturer-specific messages to be added. These shall be marked
with a manufacturer mnemonic. The mnemonic assigned to u-blox is UBX and is used for all non-standard
messages. These proprietary NMEA messages therefore have the address field set to PUBX. The first data field
in a PUBX message identifies the message number with two digits.
4.1.2 Talker ID
One of the ways the NMEA standard differentiates between GNSS is by using a two-letter message identifier,
the 'Talker ID'. The specific Talker ID used by a u-blox receiver will depend on the device model and system
configuration. The table below shows the Talker ID that will be used for various GNSS configurations.
NMEA Talker IDs
Configured GNSS
Talker ID
GPS, SBAS, QZSS
GP
GLONASS
GL
Galileo
GA
UBX-18010854 - R04
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