Weather Sensor Louver Box 4 in 1 Light Intensity CO2 Atmosphere Temperature and Humidity Transmitter for Outdoor Environment 9 to 30V 4 to 20mA Communicating Item Type: Weather Station Louver Box Material: ABS Weight: Approx. 1265.00g/44.62oz Features: Atmosphere Temperature, Atmosphere Humidity, Light Intensity, CO2 Power Supply: 9 to 30V Installation Size with Bending Plate: Approx. 262x215mm/10.31x8.46in Louver Box Size: Approx. 140x127mm/5.51x5.00in Light Intensity: 0 to 200000Lx (Outdoor), 0 to 65535Lx (Indoor) Measuring Range, ±4% Accuracy, 1Lx Resolution, 0.1mW Power Consumption CO2: 0 to 5000ppm Measuring Range, ±(50ppm+5%) Accuracy, 1ppm Resolution, 100mW Power Consumption Atmosphere Temperature: -20 to 50℃ (Analog Signal Output) Measuring Range, ±0.3℃ (Standard) Accuracy, 0.1℃ Resolution, 1mW Power Consumption Atmosphere Humidity: 0 to 100%RH Measuring Range, ±5%RH (Standard) Accuracy, 0.1%RH Resolution, 1mW Power Consumption Sensor Total Power Consumption = Multielement Power Consumption + Main Board Basic Power Consumption Operating Environment: -40℃~+75℃ Main Board Basic Power Consumption: 200mW Protective Level: IP54 Wiring: Wire Color: Wire Sequence (Current Analog Signal) Red Wire: VCC Positive Power Supply Green Wire: GND Negative Power Supply Black Wire: Signal Line 1 Yellow Wire: Signal Line 2 White Wire: Signal Line 3 Brown Wire: Signal Line 4 For Modbus CRC Check Steps: 1. Preset 16 Bit Register As Hexadecimal FFFF, Called CRC Register 2. XOR The First 8 Bit Data With The Low Bit Of The CRC Register, Put The Result On The CRC Register 3. Shift The Contents Of The Register One Bit To The Right (Toward The Low Bit) And Fill In The Highest Bit With 0, Checking The Lowest Bit 4. If The Lowest Bit Is 0: Repeat Step 3 (Shift Again); If The Lowest Bit Is 1: Xor The CRC Register With The Polynomial A001 (1010 0000 0000 0001) 5. Repeat Steps 3 And 4 Eight Times, So That The Entire 8 Bit Data is Processed 6. Repeat Steps 2 To 5 For The Next 8 Bit Data Processing 7. The Final CRC Register Is The CRC Code (The Obtained CRC Code is Low Before High) Installation Place Requirements: 1. Great Circulation Around 2. Away From Exhaust Vents, Motors And Engines And Other Equipment 3. Away From Water Pools, Fountains And Sprinklers, Etc.