Wind Direction Sensor 360 Degree All Round DC5V Powered Wind Direction Sensor Transmitter Wind Indicator Protector Shell Item Type: Wind Direction Sensor Material: ABS Product Size: Approx. 223x190x70mm/8.78x7.48x2.76in Gross Weight: Approx. 385.00g/13.6oz Power Supply Voltage: DC 5V Output: RS485 for Modbus Extension Cable Length: 0.8m/2.6ft Accuracy: Omni directional: ±3° Resolution: Omni directional: 1° Startup Wind Speed: ≤0.8m/s Maximum Power Consumption: 0.48W Load Capacity: DC 12V power supply, current output impedance ≤350Ω DC24V power supply, current output impedance ≤900Ω Voltage output impedance ≥1KΩ Operating Environment: Temperature -35℃ to 60℃ Humidity ≤100%RH non condensing Protecting Level: IP64 Cable Level: Rated voltage: 300V 80℃ Application: for garden, greenhouse, environmental protecting, meteorological station, ship, dock, aquaculture, advertising barrier, weather, marine, environment, airport, port, laboratory, agriculture and traffic environment wind direction measurement Installation Aperture: 3.2mm/0.13in Mating Plug Diameter: 15mm/0.59in (recommend reserving 25mm/0.98in for wiring, wire up 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 communicating intervals of at least 500ms or more, CRC in the manual for the parity bit, 2 bytes. Device address default address 2. Second, the communicating format 1. Write the device address (for example, write address 02)Send0006002000020810InstructionAddressWriteStarting addressNew addressCRC checkReturn0006002000020810InstructionAddressWriteStarting addressNew addressCRC checkReturn 01 86 ** ** then the configuration is not successful. 2. Read device address (e.g. read address 2) Send0003002000018411InstructionAddressReadStarting addressRead PointsCRC checkReturn00030200020445InstructionAddressReadData lengthDevice dataCRC check3. Read register data (eg: read address 2 data) Send0203000000018439InstructionAddressReadStarting addressRead PointsCRC checkReturn02030200267D9EInstructionAddressReadData lengthDevice dataCRC checkOmnidirectional 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 communicating baud rate (for example: read address 2 of the device baud rate = 9600) Send02030010000185FCInstructionAddressReadStarting addressRead PointsCRC checkReturn02030200027D85InstructionAddressReadData lengthDevice dataCRC checkBaud rate = data x 4800. return data 0x0002, then baud rate = 4800x2 = 9600. 5. Write device communicating baud rate (for example, write baud rate 9600) Send02060010000209FDInstructionAddressReadStarting addressNew baud rateCRC checkReturn02060010000209FDInstructionAddressReadStarting addressNew baud rateCRC checkBaud rate = data x 4800. write data 0x0002, then baud rate = 4800x2 = 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 communicating protocol (e.g. switch to for ASCII private protocol). Send02060014000389FCInstructionAddressWriteStarting address01 for MODBUS 03 for ASCIICRC checkReturn02060014000389FCInstructionAddressWriteStarting addressDataCRC checkIf 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 (shift again) if the lowest bit is 1: the CRC register is iso orthogonal to the polynomial A001 (1010 0000 0000 0001); 5. Repeat steps 3 and 4 until it is shifted right 8 times so that the entire 8 bit data is all processed; 6. Repeating steps 2 through 5 for the next 8 bit data; 7. The final CRC register obtained is the CRC code (the CRC code obtained is low before high). Troubleshooting : 1. The wind blades do not rotate properly, and the hysteresis is big. There are foreign objects or jammed in the bearing due to long term us