Feature 1Product Composition: Soil moisture sensor is composed of a power supply module, a transmission module, a zero drift and temperature compensation module, and a data processing module. 2Powerful Function: The sensor has built in signal sampling and amplification, zero drift and temperature compensation functions, which have little impact on soil quality and are widely used in a wide range of areas. 30100% Measurement Range: High measurement accuracy, reliable performance, quick response, good interchangeability, and high data transmission efficiency. 4Compact Design: This soil moisture sensor has a small and light appearance, which is easy to carry and connect. The cable length is about 1.5 meters, which can meet the needs of use. 5Long Lasting Use: Supports dielectric constant signal output, good sealing, IP68 protection level, can be directly buried in soil and used, not easy to be corroded or rusted.Item Type: Soil Moisture SensorMaterial: ABSWeight: Approx. 141g / 5ozProbe Material: Stainless SteelSealing Material: Epoxy ResinMeasurement Parameter: Soil Volumetric Water ContentMeasuring 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 centerProbe Diameter: Approx. 3mm / 0.12inResponse Time: 2sCable Length: Approx. 1.5m / 4.9ftWorking and Storage Conditions:Working Temperature: -40-85Working Humidity: 0-100%RHStorage Temperature: -40-125Storage 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 ProtocolCommunication Method: RS485 communication, transmission distance <1000 metersCommunication Rate: 9600, n, 8, 1Communication 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 () of the soil according to the propagation frequency of electromagnetic waves in the medium to obtain the soil volumetric water content (v).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 39Note: 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 1CNote: 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 command02 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 command02 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 attentionThere 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 00Note: The big characters are the t