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Micro-JLT GNSS™ User Manual
3.3.31 GPS:INITial:DATE <yyyy,mm,dd>
This command allows setting the internal RTC DATE manually when operating the unit in GNSS
denied environments. This command is compatible to the PTIMe:OUTput ON command available in
JLT CSAC based products to allow automatic time and date synchronization of two units to each
other. The internal RTC is driven by the highly stable ovenized oscillator 10MHz signal, and thus has
very high time accuracy.
3.3.32 GPS:INITial:TIME <hour,min,sec>
This command allows setting the internal RTC TIME manually when operating the unit in GPS
denied environments. This command is compatible to the PTIMe:OUTput ON command available in
JLT CSAC based products to allow automatic time and date synchronization of two units to each
other. The internal RTC is driven by the highly stable ovenized oscillator 10MHz signal, and thus has
very high time accuracy.
3.3.33 GPS:SYSTem:SELect [GPS | SBAS | QZSS | GAL | BD ^
GLO]
This command selects the GNSS systems that are enabled in the GNSS receiver and are used to
generate the timing and positioning information for the NMEA data, and to generate the 1PPS
reference for the GNSDO. The command is followed by a list of the shortened names of the GNSS
systems to enable. The shortened names of supported GNSS system include GPS, SBAS, QZSS, BD
(BeiDou), GAL (Galileo) and GLO (GLONASS). Please see Section
2.3 for restrictions on the
concurrent GNSS systems that can be enabled. Invalid combinations of GNSS systems will result in
a Command Error response and no change to the configuration.
The following example command will enable GPS, SBAS, Galileo and GLONASS all concurrently:
GPS:SYST:SEL GPS SBAS GAL GLO
The following command will query the currently enabled GNSS systems:
GPS:SYST:SEL?
The Micro-JLT GNSS™ will respond to the query with the list of enabled GNSS systems such as:
GPS SBAS GAL GLO
3.3.34 GPS:JAMlevel?
This command provides GNSS signal jamming-indicator. The GNSS receiver will detect, and flag
jamming interference with levels ranging from 0 (no jamming) to 255 (strong jamming). Any level
exceeding 50 and accompanied by a loss of the 1PPS signal from the GNSS receiver will cause a
SYNC:HEALTH 0x800 event to be flagged, and the unit to disable the LOCK_OK signal on
connector J1.
3.3.35 GPS:FWver?
This command queries and returns the Firmware version used inside the GNSS receiver itself.