Jackson Labs RSR GNSS Transcoder, User Manual

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© 2017 Jackson Labs Technologies, Inc. 65
RSR GNSS Transcoder™ User Manual
GNSS lock is achieved. Changing this setting requires a reset or power-cycle for the new setting to
become effective.
4.7.12 SYNChronization:health?
The SYNChronization:health? query returns a hexadecimal number indicating the system’s
health-status. Error flags are encoded in a binary fashion so that each flag occupies one single bit of
the binary equivalent of the hexadecimal health-status flag. This allows for easy query and
fully-orthogonal status indications using only one single hex parameter.
The following system parameters are monitored and indicated through the health-status indicator.
Individual parameters are ‘ored’ together which results in a single hexadecimal value encoding the
following system status information:
As an example, if the unit is in GNSS receiver holdover, and the voltage is too high, and the UTC
phase offset is > 250ns then the following errors would be indicated:
1) UTC phase > 250ns: 0x4
2) Voltage too high: 0x40
3) GNSS receiver in holdover: 0x10
‘Oring’ these values together results in:
0x40 | 0x10 | 0x4 = 0x54
If the OCXO coarse-DAC is maxed-out at 255 HEALTH STATUS |= 0x1;
If the OCXO coarse-DAC is mined-out at 0 HEALTH STATUS |= 0x2;
If the phase offset to UTC is >250ns HEALTH STATUS |= 0x4;
If the run-time is < 300 seconds HEALTH STATUS |= 0x8;
If the GNSS receiver is in holdover > 60s HEALTH STATUS |= 0x10;
If the Frequency Estimate is out of bounds HEALTH STATUS |= 0x20;
If the supply voltage is too high HEALTH STATUS |= 0x40;
If the supply voltage is too low HEALTH STATUS |= 0x80;
If the short-term-drift (ADEV @ 100s) > 100ns HEALTH STATUS |= 0x100;
For the first 3 minutes after a phase-reset, or a coarsedac change: HEALTH STATUS |= 0x200;
If the GNSS receiver indicates a strong jamming signal of >=50
(range is 0 to 255) (only supported on uBlox external receivers) HEALTH STATUS |= 0x800;
If FPGA error occur HEALTH STATUS |= 0x2000;
If simulation update timeouts occur HEALTH STATUS |= 0x4000;
If internal GPS receiver C/No values out of range (>2dB error) HEALTH STATUS |= 0x8000;
If internal GPS receiver position out of range (>10 meters) HEALTH STATUS |= 0x10000;
If internal GPS receiver 1PPS timing out of range (>100 ns) HEALTH STATUS |= 0x20000;