2 parameter registers, Parameter registers – In-Situ Aqua TROLL 400 Modbus and SDI-12 Reference Guide User Manual
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7.2 Parameter Registers
Register
Size
(registers)
Mode & Access Level
(R/W)
Data
Type
Description
pH
If the parameter value is read when the sensor is not plugged in, it returns the sentinel value and a Data
Quality ID of 7 (sensor communication error).
If the parameter value calculates to a value outside of the range 0 to 14 pH, it shall return the sentinel
value and a Data Quality ID of 3 (error).
1538
2
R1
float
Measured value
1540
1
R1
ushort Parameter ID = 17 (pH)
1541
1
R1/W2
ushort Units ID
145 = pH (default)
1542
1
R1
ushort Data Quality ID
1543
2
R1/W3
float
Off line sentinel value (default = 0.0)
1545
1
R1
16 bits Available Units = 0x0001 (1)
pH/mV
If the parameter value is read when the sensor is not plugged in, it shall return the sentinel value and a
Data Quality ID of 7 (sensor communication error).
1546
2
R1
float
Measured value
1548
1
R1
ushort Parameter ID = 18 (pH mV)
1549
1
R1/W2
ushort Units ID
162 = mV (default)
1550
1
R1
ushort Data Quality ID
1551
2
R1/W3
float
Off line sentinel value (default = 0.0)
1553
1
R1
16 bits Available Units = 0x0002 (2)
ORP/mV
If the parameter value is read when the sensor is not plugged in, it shall return the sentinel value and a
Data Quality ID of 7 (sensor communication error).
1554
2
R1
float
Measured value
4556
1
R1
ushort Parameter ID = 19 (ORP)
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