Total Solar Radiation Sensor 5V High Accuracy RS485 Photoelectric Solar Radiation Measuring Instrument for Weather Construction Item Type: Total Solar Radiation Sensor Material: Aluminum Alloy Weight: Approx. 300g / 10.6oz Power Supply: 5V Output: RS485 (Default for Modbus Protocol) Product Size: 65x52x49mm / 2.6x2.0x1.9in Bottom Hole Distance: 57mm / 2.2in Spectrum Range: 300-1100nm Resolution: 1W/m2 Measuring Range: 0-1500W/ m2 Sensitivity: 7-14μV/W m 2 Accuracy: ±5% Load Capacity: Current Type Output Impedance RL ≤ 250Ω, Voltage Type Output Impedance RL ≥ 1KΩ Response Time: <5s Cosine Response: ＜±10%（When Sun Altitude Angle 10°) Non Linearity: ＜±5% Annual Variation Rate: <±5% Operating Environment: Temperature -40℃-60℃, Humidity ≤100%RH Product Power Consumption: 0.48W Wire Sequences: Red: Power Positive Black: A+ Yellow: B- Green: Power Negative Steps For Modbus CRC Verification 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 (toward the lower bit) and filling the highest bit with a zero; 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 right shifted 8 times so that the entire 8 bit data is all processed; 6. Repeat steps 2 through 5 for the next 8 bit data; The final CRC register obtained is the CRC code (the CRC code obtained is the low before the high). Troubleshooting: The meter display value is incorrect when outputting. It may be due to wiring problems or 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