LC_XO GPSDO User Manual
30 © 2012 Jackson Labs Technologies, Inc.
4.2.3 HELP?
This query returns a list of the commands available for the FireFly GPSDO.
4.3 GPS Subsystem
Note: Please note that LC_XO displays antenna height in MSL Meters rather than in GPS Meters on
all commands that return antenna height [the legacy Fury GPSDO uses GPS height].
The GPS subsystem regroups all the commands related to the control and status of the GPS receiver.
The list of the commands supported is the following :
GPS:SATellite:TRAcking:COUNt?
GPS:SATellite:VISible:COUNt?
GPS:GPGGA <int> [0,255]
GPS:GGASTat <int> [0,255]
GPS:GPRMC <int> [0,255]
GPS:XYZSPeed <int> [0,255]
GPS:POSition?
GPS:RESET ONCE
GPS
4.3.1 GPS:SATellite
This group of commands describe the satellite constellation.
4.3.2 GPS:SATellite:TRAcking:COUNt?
This query returns the number of satellites being tracked.
4.3.3 GPS:SATellite:VISible:COUNt?
This query returns the number of satellites (PRN) that the almanac predicts should be visible, given
date, time, and position.
4.3.4 NMEA Support
The following two commands allow the LC_XO GPSDO to be used as an industry standard
navigation GPS receiver. The GPGGA and GPRMC NMEA commands comprise all necessary
information about the antenna position, height, velocity, direction, satellite info, fix info, time, date
and other information that can be used by standard navigation applications via the LC_XO serial
interface.
Once enabled, LC_XO will send out information on the serial transmit pin automatically every N
seconds. All incoming serial commands are still recognized by LC_XO since the serial interface
transmit and receive lines are completely independent of one another.
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