In-Situ Aqua TROLL 400 Modbus and SDI-12 Reference Guide - Manual (Page 30)

4.5 Next Factory Calibration
This field returns the expiration time of the installed sensor cap. This value is the lesser of the
cap manufactured time plus 24 months, or the cap start time plus 12 months. The probe returns
zero if the sensor cap is not installed.
4.6 Warm-Up Time
If automatic salinity correction is disabled, this register returns the RDO sensor warm-up time. If
automatic salinity correction is enabled, this register returns the sum of the RDO sensor and
conductivity sensor warm-up times.
4.7 Fast Sample Rate
If automatic salinity correction is disabled, this register returns the RDO sensor fast sample rate.
If automatic salinity correction is enabled, this register returns the sum of the RDO sensor and
conductivity sensor fast sample rates.
4.8 Parameter Registers—RDO
Register Size
(registers)
Mode & Access Level
(R/W)
Data
Type
Description
Dissolved Oxygen Concentration
Dissolved oxygen concentration is calculated from the oxygen partial pressure and temperature using
settings contained in the sensor calibration registers.
If the parameter value is read when the sensor cap is not installed, the register returns the sentinel value
and a Data Quality ID of 7 (sensor communication error).
0038 2 R1 float Measured value, C
0
0040 1 R1 ushort Parameter ID = 20
0041 1 R1/W2 ushort Units ID
117 = mg/L (default)
118 = µg/L
0042 1 R1 ushort Data Quality ID
0043 2 R1/W3 float Off line sentinel value (default = 0.0)
0045 1 R1 16 bits Available Units = 0x0030 (48)
Temperature
0046 2 R1 float Measured value
30