© 2017 Jackson Labs Technologies, Inc. 35
Mini-JLT GNSS™ User Manual
3.10.11 SERVo:1PPSoffset
This command sets the Mini-JLT GNSS™ 1PPS signal’s offset to UTC in 16.7ns steps.
Using the SERV:1PPS command results in immediate phase change of the 1PPS output signal.
This command has the following format:
SERVo:1PPSoffset <int> ns
3.10.12 SERVo:TRACe
This command sets the period in seconds for the debug trace. Debug trace data can be used with
Ulrich Bangert’s “Plotter” utility to show UTC tracking versus time etc.
This command has the following format:
SERVo:TRACe <int > [0,255]
An example output is described here:
08-07-31 373815 60685 -32.08 -2.22E-11 14 10 6 0x54
[date][1PPS Count][Fine DAC][UTC offset ns][Frequency Error Estimate][Sats Visible][Sats
Tracked][Lock State][Health Status]
Please see the SYNChronization? command for detailed information on how to decode the health
status indicator values. The Lock State variable indicates one of the following states:
3.10.13 SERVo?
This command returns the result of the following queries:
SERVo:COARSeDac?
SERVo:DACGain?
SERVo: EFCScale?
SERVo:EFCDamping?
Value State
0 OCXO warmup
1 Holdover
2 Locking (OCXO training)
4 [Value not defined]
5 Holdover, but still phase locked (stays in this
state for about 100s after GNSS lock is lost)
6 Locked, and GNSS active
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