In-Situ Aqua TROLL 400 Modbus and SDI-12 Reference Guide - Manual (Page 28)

3.3 Automatic Barometric Correction
Set this register to 0 to disable automatic barometric correction. Set to 1 to enable automatic
barometric correction. The default is disabled. If enabled, the level sensor shall subtract the live
barometric pressure register from its pressure sensor readings. This register shall not affect how
the RDO sensor utilizes the live barometric pressure register to calculate its parameters.
3.4 Automatic Density Correction
Set this register to 0 to disable automatic density correction. Set to 1 to enable automatic
density correction. The default is disabled. If disabled, the level sensor shall apply its specific
gravity value to convert pressures to level. If enabled, the level sensor shall use the density
value from the conductivity sensor to convert pressures to level.
4. Modbus Registers—RDO Sensor
4.1 Header Registers—RDO
The sensor map data-register offset points to the first register in the sensor data header block.
The current value for this sensor data register map version is 1.
Register Size
(registers)
Mode & Access Level
(R/W)
Data
Type
Description
0001 1 R1 ushort Sensor ID = 42
0002 2 R1 ulong Sensor serial number (0 = no cap)
0004 1 R1 16 bits Sensor status
0005 3 R1 time Last factory calibration
(cap start time, 0 = no cap)
0008 3 R1 time Replace cap
0 = no cap
8 = Service period exceeded
or moderate abrasion detected on cap
0011 3 R1 time Last user calibration
0014 3 R1/W2 time Next user calibration
(0 = none required)
0017 1 R1 ushort Warm-up time in milliseconds = 2000
0018 1 R1 ushort Fast sample rate = 1200 milliseconds
0019 1 R1 ushort Number of sensor parameters (N) = 4
28