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Table of Contents
1.
Controller Requirements and Connections .......................................................................... 6
1.1
Wiring Overview .................................................................................................... 6
1.2
Power Connections ............................................................................................... 6
1.3
SDI-12 Wiring Diagram ......................................................................................... 7
1.4
Modbus Master RS485 Wiring Diagram ................................................................ 8
1.5
Modbus Master RS232 Wiring Diagram (Converter Required) .............................. 9
1.6
RS485 Network Guidelines ..................................................................................10
2.
SDI-12 Interface .................................................................................................................12
2.1
Instrument Defaults ..............................................................................................12
2.2
Device Identification .............................................................................................13
2.3
Basic Commands .................................................................................................14
2.4
Extended Commands ..........................................................................................17
2.5
SDI-12 Configuration File .....................................................................................25
2.5.1
Connect the Communication Device and Comm Kit Software ..........................25
2.5.2
SDI-12 Setup ....................................................................................................26
3.
Modbus Registers—Probe .................................................................................................27
3.1
Modbus Communication Setup ............................................................................27
3.2
Automatic Salinity Correction ...............................................................................27
3.3
Automatic Barometric Correction .........................................................................28
3.4
Automatic Density Correction ...............................................................................28
4.
Modbus Registers—RDO Sensor ......................................................................................28
4.1
Header Registers—RDO .....................................................................................28
4.2
Sensor Serial Number ..........................................................................................29
4.3
Sensor Status ......................................................................................................29
4.4
Last Factory Calibration .......................................................................................29
4.5
Next Factory Calibration ......................................................................................30
4.6
Warm-Up Time ....................................................................................................30
4.7
Fast Sample Rate ................................................................................................30
4.8
Parameter Registers—RDO .................................................................................30
4.9
Calibration Registers—RDO ................................................................................32
4.10
Live Salinity Value ...............................................................................................33
4.11
Default Salinity Value ...........................................................................................33
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