In-Situ Aqua TROLL 400 Modbus and SDI-12 Reference Guide - Manual (Page 31)

Register Size
(registers)
Mode & Access Level
(R/W)
Data
Type
Description
0048 1 R1 ushort Parameter ID = 1
0049 1 R1/W2 ushort Units ID
1 =
°C (default)
2 =
°F
0050 1 R1 ushort Data Quality ID
0051 2 R1/W3 float Off line sentinel value (default = 0.0)
0053 1 R1 16 bits Available Units = 0x0003 (3)
Dissolved Oxygen %Saturation
The saturation parameter is calculated from dissolved oxygen concentration and 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).
0054 2 R1 float Measured value
0056 1 R1/W2 ushort Parameter ID = 21
0057 1 R1/W2 ushort Units ID
177 = percent saturation (default)
0058 1 R1 ushort Data Quality ID
0059 2 R1/W3 float Off line sentinel value (default = 0.0)
0061 1 R1 16 bits Available Units = 0x0001 (1)
Oxygen Partial Pressure
Oxygen partial pressure is calculated using calibration information stored in the sensor cap.
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).
0062 2 R1 float Measured value
0064 1 R1 ushort Parameter ID = 30
(oxygen partial pressure)
0065 1 R1/W2 ushort Units ID
26 = torr (default)
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