Item Type: Soil Moisture Sensor <br>Material: ABS <br>Weight: Approx. 141g / 5oz <br>Probe Material: Stainless Steel <br>Sealing Material: Epoxy Resin <br>Measurement Parameter: Soil Volumetric Water Content <br>Measuring Range: 0-100% <br>Measurement Accuracy: ±3% <br>Resolution: 0.1% <br>Measurement Area: A cylinder with a diameter of 7cm and a height of 7cm surrounding the central probe with the central probe as the center <br>Probe Diameter: Approx. 3mm / 0.12in <br>Response Time: 2s <br>Cable Length: Approx. 1.5m / 4.9ft <br>Working and Storage Conditions: <br>Working Temperature: -40-85℃ <br>Working Humidity: 0-100%RH <br>Storage Temperature: -40-125℃ <br>Storage Humidity: <80% (No Condensation) <br>Protection Level: IP68 <br> V: Voltage TypeA: Current TypeR: RS485 Type <br>Operating Voltage7-24V12-24V7-24V <br>Working Current3-5mA3-25mA3-5mA <br>Output SignalOutput Signal 0-2V DC4-20mARTU Protocol <br> <br>RTU Protocol <br>Communication Method: RS485 communication, transmission distance <1000 meters <br>Communication Rate: 9600, n, 8, 1 <br>Communication Protocol: RTU protocol, the factory station number (device address) is station 2, which can be modified as needed. <br>Commands of RTU Protocol Include: Read the value of soil moisture (the factory is station 2) <br>Working Principle: <br>FDR frequency domain method uses the principle of electromagnetic pulse to measure the dielectric constant (ε) of the soil according to the propagation frequency of electromagnetic waves in the medium to obtain the soil volumetric water content (θv). <br>Scope of Application: Suitable for water-saving agricultural irrigation, greenhouses, flowers and vegetables, grassland pastures, soil rapid testing, plant cultivation, scientific experiments, underground oil, gas pipelines and other pipeline anti-corrosion monitoring fields. <br>Wiring: <br>Line ColorRed LineBlack LineWhite Line <br>SimulationPower PositivePower NegativeSignal <br>Line ColorRed LineBlack LineYellow LineBrown Line <br>RS485Power PositivePower Negative485A485B <br> <br>Example of Read Command Format: 02 03 00 00 00 01 84 39 <br>Note: The first byte 02 at the beginning is the station number. If you have modified the station number setting, you should change the first digit 02 to the station number you set. The last two digits 84 39 are CRC16 checksums, and customers need to calculate them by themselves. <br>Example of Command Format of Returned Data: 02 03 02 01 1F BC 1C <br>Note: The 4 and 5 bits of 01 1F are the moisture value, and BC 1C is the returned CRC check. <br>Analysis Method of Soil Moisture Data: Moisture=0X011F/10=28.7% <br>Modify Own Station Number: <br>Method 1: Know the current station number and send the following command <br>02 10 10 00 00 01 02 00 03 E3 60 Its function is to change the station number from No. 2 to No. 3. <br>Note: Replace italicized characters with the original station number, and replace the regular characters with the value of the target station number that you want to modify. Sending requires the customer to calculate the CRC value by himself. <br>Method 2: Know the current station number and send the following command <br>02 06 10 00 00 03 CD 38 Its function is to change the station number from No. 2 to No. 3. <br>Note: Replace the italicized characters with the original station number, and replace the regular characters with the value of the target station number that you want to modify. Sending requires the customer to calculate the CRC value by himself. <br>Method 3: Forget the original station number, you need to connect the product to the computer alone, pay attention <br>There can be no other 485 products on the bus. Use station 0 to operate them. The instructions are as follows: 00 10 10 00 00 01 02 00 03 FA 00 <br>Note: The big characters are the target station number value