© 2019 Jackson Labs Technologies, Inc. 17
Micro-JLT GNSS™ User Manual
$GNGGA,hhmmss.00,llll.llll,S/N,yyyyy.yyyy,W/E,f,ss,hh.h,aa.a,M,gg.g,M,,*[checksum]
The GGA output message header includes the talker ID for the currently enabled GNSS system or
systems as described in Section 3.3.4 . The GGA message shows height in MSL Meters, this is
different from traditional GPS receivers that display height in GPS Meters. The difference between
MSL and GPS height can be significant, 35m or more are common.
3.3.6 GPS:GGASTat <int> [0,255]
This command instructs the Micro-JLT GNSS™ to send a modified version of the NMEA standard
GGA message every N seconds, with N in the interval [0,255]. The command is disabled until the
GNSS receiver achieves a first fix.
This command has the following format:
GPS:GGASTat <int> [0,255]
The GGASTat string has the following data format:
$GNGGA,hhmmss.00,llll.llll,S/N,yyyyy.yyyy,W/E,l,ss,hh.h,aa.a,M,gg.g,M,,*[checksum]
This command replaces the regular NMEA GGA validity flag with a decimal number indicating the
lock-state of the unit. Please see Section 3.10.12 SERVo:TRACe for a detailed description of the lock
state variable. The command allows capture of the position and other information available in the
GGA command, as well as tracking the lock state and health of the unit’s OCXO performance
simultaneously.
The GGASTat output message header includes the talker ID for the currently enabled GNSS system
or systems as described in Section 3.3.4 . GGASTat output shows height in MSL Meters, this is
different from traditional GPS receivers that display height in GPS Meters. The difference between
MSL and GPS height can be significant, 35m or more are common.
3.3.7 GPS:GPGLL <int> [0,255]
This command instructs the Micro-JLT GNSS™ to send the NMEA standard GLL message every N
seconds, with N in the interval [0,255]. The command is disabled until the GNSS receiver achieves a
first fix.
This command has the following format:
GPS:GPGLL <int> [0,255]
The GPGLL string has the following data format:
$GNGLL,llll.llll,S/N,yyyyy.yyyy,W/E,hhmmss.00,s,m*[checksum]
The GLL output message header includes the talker ID for the currently enabled GNSS system or
systems as described in Section 3.3.4 .
3.3.8 GPS:GPRMC <int> [0,255]
This command instructs the Micro-JLT GNSS™ to send the NMEA standard RMC message every N
seconds, with N in the interval [0,255]. The command is disabled until the GNSS receiver achieves a
first fix.
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