Reference Guide User Manual

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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