IP68 Soil Moisture Sensor Humidity Transducer for Garden Greenhouse Agriculture 0‑100% 2s ResponseOutput RS485 7‑24V Item Type: Soil Moisture Sensor Material: ABS Weight: Approx. 141g / 5oz Probe Material: Stainless Steel Sealing Material: Epoxy Resin Measurement Parameter: Soil Volumetric Water Content Measuring Range: 0-100% Measurement Accuracy: ±3% Resolution: 0.1% 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 Probe Diameter: Approx. 3mm / 0.12in Response Time: 2s Cable Length: Approx. 1.5m / 4.9ft Working and Storage Conditions: Working Temperature: -40-85℃ Working Humidity: 0-100%RH Storage Temperature: -40-125℃ Storage Humidity: <80% (No Condensation) Protection Level: IP68   V: Voltage Type A: Current Type R: RS485 Type Operating Voltage 7-24V 12-24V 7-24V Working Current 3-5mA 3-25mA 3-5mA Output Signal Output Signal 0-2V DC 4-20mA RTU Protocol RTU Protocol Communication Method: RS485 communication, transmission distance <1000 meters Communication Rate: 9600, n, 8, 1 Communication Protocol: RTU protocol, the factory station number (device address) is station 2, which can be modified as needed. Commands of RTU Protocol Include: Read the value of soil moisture (the factory is station 2) Working Principle: 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). 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. Wiring: Line Color Red Line Black Line White Line Simulation Power Positive Power Negative Signal Line Color Red Line Black Line Yellow Line Brown Line RS485 Power Positive Power Negative 485A 485B Example of Read Command Format: 02 03 00 00 00 01 84 39 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. Example of Command Format of Returned Data: 02 03 02 01 1F BC 1C Note: The 4 and 5 bits of 01 1F are the moisture value, and BC 1C is the returned CRC check. Analysis Method of Soil Moisture Data: Moisture=0X011F/10=28.7% Modify Own Station Number: Method 1: Know the current station number and send the following command 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. 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. Method 2: Know the current station number and send the following command 02 06 10 00 00 03 CD 38 Its function is to change the station number from No. 2 to No. 3. 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. Method 3: Forget the original station number, you need to connect the product to the computer alone, pay attention 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 Note: The big characters are the target station number value that you want to modify. The customer calculates the CRC check value by himself. This sensor uses the FDR method (frequency domain method) to measure soil moisture, which can correspond to the soil volumetric moisture content. The FDR method (frequency domain method) measuring soil moisture is mainly related to the pH of the measured soil, the density of the soil, the soil quality, and the depth of the measurement. Fault Analysis and Elimination: 1. The sensor output signal is abnormal Check whether the supply voltage is stable Check whether the power supply range is normal Check whether the line is virtual 2. The sensor has no signal output Check whether the positive and negative poles of the power supply and the ground wire are connected correctly Check whether the power supply voltage meets the requirements Care and Maintenance: This instrument is a scientific and technological product with excellent design and functional principles, and attention should be paid to maintenance. The following suggestions will help you effectively use maintenance services. 1. Prevent the instrument from being scratched, maint