Wind Direction Sensor 360 Degree High Accuracy Rotation Type Anemometer Instrument for Garden DC9‑30V Item Type: Wind Direction Sensor Material: ABS Size: Approx. 223 x 190 x 70mm / 8.8 x 7.5 x 2.8in Gross Weight: Approx. 375g / 13.2oz Power Supply Voltage: DC9-30V Output: RS485 for Modbus Measuring Range: 0‑359° All Round Extension Line Length: 0.8m / 2.6ft Accuracy: Full Range: ±3 Degree Resolution: Full Range: 1 Degree Starting Wind Speed: ≤0.8m/s Maximum Power Consumption: 0.48W Load Capacity: DC12V Power Supply, Current Output Impedance ≤350Ω, DC24V Power Supply, Current Output Impedance ≤900Ω Voltage Output Impedance: ≥1KΩ Operating Environment: Temperature -35℃-60℃, Humidity ≤100%RH No Condensation Waterproof Level: IP64 Cable Level: Rated Voltage: 300V 80℃ Wide Application: Suitable for Wind Direction Measurement in Gardens, Greenhouses, Weather Stations, Ships, Docks, Aquaculture, Advertising Barriers, Meteorology, Marine, Environmental, Airports, Ports, Laboratories, Agriculture, And Transportation Environments Installation Aperture: 3.2mm / 0.1in Aerial Insert Diameter: 15mm / 0.6in (Recommended to Reserve 25mm for Wiring, Connect the Wires First, Then Install and Fix the Sensor) Wiring Method: Red Wire: Power Positive (Voltage, Current, Pulse), Power Positive (RS485) Black Wire: Power Negative (Voltage, Current, Pulse), A+ (RS485) Yellow Wire: Signal (Voltage, Current, Pulse), B- (RS485) Green Wire: Power Negative (RS485) Standard for ModBus RTU Communicating Protocol: First, the serial port format: Data bits 8 bits, stop bit 1 bit, parity bit none, default baud rate 9600bps, serial port software set to hex send and receive, two communicate intervals of at least 500ms or more, CRC in the manual for the parity bit, 2 bytes. Device address default address 2. Second, the communicate format: 1. Write the device address (for example, write address 02) Send 00 06 00 20 00 02 08 10 Instruction Address Write Starting address New address CRC check Return 00 06 00 20 00 02 08 10 Instruction Address Write Starting address New address CRC check Return 01 86 ** ** then the configuration is not successful. 2. Read device address (such as read address 2) Send 00 03 00 20 00 01 84 11 Instruction Address Read Starting address Read Points CRC check Return 00 03 02 00 02 04 45 Instruction Address Read Data length Device data CRC check 3. Read register data such as read address 2 data) Send 02 03 00 00 00 01 84 39 Instruction Address Read Starting address Read Points CRC check Return 02 03 02 00 26 7D 9E Instruction Address Read Data length Device data CRC check Omnidirectional wind sensor returns data as 0x0026 converted to decimal as 38 , the wind direction value is 38 degrees, no decimal places. If it is an eight direction wind direction sensor, the return data refers to the table of eight direction calculation formula on page 1. 4. Read device communicate baud rate (for example: read address 2 of the device baud rate equal to 9600) Send 02 03 00 10 00 01 85 FC Instruction Address Read Starting address Read Points CRC check Return 02 03 02 00 02 7D 85 Instruction Address Read Data length Device data CRC check Baud rate equal to data x 4800. return data 0x0002, then baud rate equal to 4800x2 = 9600. 5. Write device communicate baud rate (for example, write baud rate 9600)Send02060010000209FDInstructionAddressReadStarting addressNew baud rateCRC checkReturn02060010000209FDInstructionAddressReadStarting addressNew baud rateCRC checkBaud rate equal to data x 4800. write data 0x0002, then baud rate equal to 4800x2 equal to 9600. supported baud rates are 4800, 9600, 14400, 19200, 38400, 57600, 115200. if write other unsupported baud rate, it will be automatically restored to 9600 after reboot. Returning 01 86 ** ** means the configuration is not successful. 6. Switch the communicate protocol (such as switch to for ASCII private protocol) Send 02 06 00 14 00 03 89 FC Instruction Address Write Starting address 01 for MODBUS CRC check 03 for ASCII Return 02 06 00 14 00 03 89 FC Instruction Address Write Starting address Data CRC check If 01 86 ** ** is returned, the configuration was unsuccessful. Change the protocol from 01 for MODBUS to 03 for ASCII private protocol. for Modbus CRC checking steps: 1. Preset the 16 bit register as hexadecimal FFFF, call this register as CRC register; 2. Isolate the first 8 bit data with the lower bit of the CRC register and put the result in the CRC register; 3.Check the lowest bit by shifting the contents of the register one bit to the right (towards the lower bit) and filling the highest bit with a 0; 4. If the lowest bit is 0: repeat step 3 (shifting again)