In-Situ Aqua TROLL 400 Modbus and SDI-12 Reference Guide - Manual (Page 33)

4.10 Live Salinity Value
The live salinity value is used to correct the oxygen concentration value for salinity when
automatic salinity correction is disabled. Values must be written in Practical Salinity Units (PSU)
in the range 0 to 42 PSU. This is not a measured parameter. If automatic salinity correction is
enabled, the salinity value is obtained from the conductivity sensor and the live salinity will have
no effect.
4.11 Default Salinity Value
The default salinity value is loaded into the live salinity value register when power is applied to
the probe or when the default value is changed. It is used in calculations until a live salinity
value is written. This is not a measured parameter. If automatic salinity correction is enabled,
the salinity value is obtained from the conductivity sensor and the default salinity will have no
effect.
4.12 Live Barometric Pressure
The live barometric pressure is used in the calculation of percent saturation and to determine
the theoretical saturation point during calibration. Values must be written in millibars in the range
506.625 to 1114.675 mbar. This is not a measured parameter.
4.13 Default Barometric Pressure
The default barometric pressure is loaded into the live barometric pressure register when power
is applied to the probe or when the default value is changed. It is used in calculations until a live
barometric pressure is written. This is not a measured parameter.
4.14 100% Saturation Calibration Values
These values represent the sensor conditions while the probe is in a 100% saturation calibration
environment. These are not measured values, they are written by the controller during the
calibration process.
Writes to these registers are only accepted if the probe is in the calibration mode. The probe will
return exception 0x92 (invalid sensor mode) if an attempt is made to write these registers when
the calibration mode is off.
4.15 Zero% Saturation Calibration Values
These values represent the sensor conditions while the probe is in a 0 % saturation calibration
environment. These are not measured values, they are written by the controller during the
calibration process.
Writes to these registers are only accepted if the probe is in the calibration mode. The probe will
return exception 0x92 (invalid sensor) if an attempt is made to write these registers when the
calibration mode is off.
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