SKU: TH2221
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RS485 Photoelectric Solar Radiation Sensor (400-1100nm) is designed to measure sunlight intensity across the 400-1100nm wavelength range and output the data over an RS485 interface. With a measurement range of 0-1800W/m², it is well suited for environmental monitoring, solar energy systems, and agricultural field deployment.
The sensor uses the Modbus-RTU protocol, making it easier to integrate into PLCs, data loggers, microcontroller projects, and industrial monitoring networks. Its wide DC 5-30V supply range and low working current of less than 10mA simplify installation in both fixed and remote sensing setups.
Built for outdoor use, the sensor features IP67 protection and is intended for applications such as crop growth monitoring, photovoltaic performance analysis, meteorological observation, plant physiology research, and ecological studies.
Technical details for the RS485 Photoelectric Solar Radiation Sensor.
| Power Supply | DC 5-30V |
|---|---|
| Working Current | <10mA |
| Output Mode | RS485 |
| Protocol | Modbus-RTU |
| Measurement Range | 0-1800W/m² |
| Wavelength Range | 400-1100nm |
| Accuracy | ±5% |
| Resolution | 1W/m² |
| Response Time | ≤10S |
| Non-Linearity | <±2% |
| Annual Stability | ≤±2% |
| Cosine Response | ≤±10% |
| Operating Temperature | -25°C to +60°C |
| Protection Level | IP67 |
| Sensor Cable Length | 20cm |
| Adapter Cable Length | 70cm |
| Baud Rate | 2400, 4800, 9600 bit/s configurable; default 4800 bit/s |
Wire functions for power and RS485 communication.
| Wire Color | Name | Function |
|---|---|---|
| Brown | VCC | Power input positive, DC 5-30V |
| Black | GND | Power ground |
| Yellow | 485-A | RS485 data line A |
| Blue | 485-B | RS485 data line B |
The sensor supports Modbus-RTU with 8 data bits, no parity, 1 stop bit, and CRC error checking. Factory default device address is 0x01. Register access includes reading the solar radiation value from address 0000H, with writable registers available for deviation value, device address, and baud rate.
It measures sunlight in the 400-1100nm wavelength range and reports solar radiation from 0 to 1800W/m². The stated resolution is 1W/m².
The sensor works from a DC 5V to 30V supply and its working current is listed as less than 10mA. The brown wire is VCC and the black wire is GND.
It uses an RS485 interface with Modbus-RTU protocol. Default communication settings are address 0x01, baud rate 4800bps, 8 data bits, no parity, 1 stop bit, and CRC error checking.
Yes, the reference guide shows it being used with an Arduino UNO R3 through an RS485-to-UART adapter module. The documented pin mapping is brown for VCC, black for GND, yellow for 485-A, and blue for 485-B.
It is designed for outdoor use and has an IP67 protection rating. The operating temperature range is -25°C to +60°C.
Check that the power supply is within the marked range, confirm the RS485 A/B lines are not reversed, and make sure there is an actual sunlight source. The supplier also recommends keeping the protective dust cover clean and not removing the transparent protective cover.
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