Total Solar Radiation Sensor for Modbus RS485 0.3 to 1.1μm High Accuracy Pyranometer Sensor for Weather Station 9-30V Item Type: Solar Radiation Sensor Wire Color: Red: Output signal RS485: Power Positive Black: Output signal RS485: A+ Yellow: Output signal RS485: B- Green: Output signal RS485: Power Negative Power Supply: 9-30V Output: RS485 (default for Modbus protocol) Product Size: Approx. 65 x 52 x 49mm / 2.6 x 2 x 1.9in, Bottom Hole Distance: Approx. 57mm / 2.2in Material: Aluminum Alloy Spectrum Range: 300-1100nm Resolution: 1W/㎡ Measurement Range: 0-1500W/㎡ Sensitivity: 7-14μV/W •㎡ Accuracy: ±5% Load Capacity: Current Output Impedance RL≤250Ω Voltage Output Impedance RL≥1KΩ Response Time: <5s Cosine Response: <±10% (Sun Height Angle 10°) Non Linearity: <±5% Yearly Variation: <±5% Operating Environment: Temperature -40℃ to 60℃; Humidity ≤100%RH Power Consumption: 0.48 W Weight: Approx. 298.00g / 10.51oz For Modbus CRC checking steps :. 1. Preset the 16 bit register to 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. shift the contents of the register one bit to the right (towards the low bit), fill the highest bit with 0, and check the lowest bit; 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. repeat steps 2 to 5 for the next 8 bit data; The final CRC register obtained is the CRC code (the CRC code obtained is low before high). Trouble Removal: The meter display value is incorrect when outputting. It may be due to wiring problems or comm serial port failure that the correct data cannot be acquired. Please check whether the wiring is correct and firm, whether the serial port is occupied, and whether the serial port setting is correct;