User Manual

The HE910V2 module is equipped with gpsOne that is controllable by the modem using a set
of AT commands or dedicated NMEA sentences.
4 serial ports are available on the module:
 UART SERIAL PORT
 MODEM USB SERIAL PORT
 AUX USB SERIAL PORT
 NMEA USB SERIAL PORT
GPS receivers perform initial position and velocity calculations using an earth-centered earth-
fixed (ECEF) coordinate system. Results may be converted to an earth model (geoid) defined
by the selected datum. For HE910V2 the default datum is WGS 84 (World Geodetic System
1984) which provides a worldwide common grid system that may be translated into local
coordinate systems or map dates. (Local map dates are a best fit to the local shape of the earth
and not valid worldwide).2
The NMEA 0183 is a specification created by the National Marine Electronics Association
(NMEA) that defines the interface between other marine electronic equipment. The standard
permits marine electronics to send information to computers and to other marine equipment.
GPS receiver communication is defined within this specification. The actually supported
version is 2.2
The provided NMEA sentences are:
GGA Time, position and fix type data.
GLL Geographic Position - Latitude/Longitude
GSA GPS receiver operating mode, satellites used in the position solution and DOP values.
GSV The number of GPS satellites in view satellite ID numbers, elevation, azimuth, and SNR
values.
RMC Time, date, position, course and speed data.
VTG Course and speed information relative to the ground