The XY-MD02 module is an industrial-grade temperature and humidity sensor based on the SHT20 element, featuring RS-485 Modbus RTU communication. It is designed for monitoring temperature and humidity in industrial environments, warehouses, control rooms, agriculture, and building automation systems. Please note that the actual product color may vary slightly due to lighting conditions, display differences, or manufacturing batches. Technical Specifications: Core sensor SHT20 (digital temperature & humidity sensor) Temperature range −40 ~ +60 °C Temperature accuracy ±0.5 °C Temperature resolution 0.1 °C Humidity range 0 ~ 80 % RH Humidity accuracy ±3 % RH Humidity resolution 0.1 % RH Operating voltage DC 5 – 30 V Communication interface RS-485 (Modbus RTU) Protocol Modbus RTU Default baud rate 9600 bps Data format 8 data bits, no parity, 1 stop bit (8N1) Default slave ID 1 Communication distance Up to 1000 m (twisted-pair cable) Mounting type DIN rail 35 mm Dimensions ≈ 65 × 46 × 25 mm Connectivity Terminal A/B → RS-485 bus Terminal V+ / GND → DC 5 – 30 V Power Supply Application Temperature & humidity monitoring in production areas or warehouses Building automation and greenhouse control systems Laboratory environmental monitoring Cabinet or electrical panel climate monitoring Tested with Modbus Doctor with default setting: Baudrate: 9600 Data bits: 8 Parity: None Stop bits: 1 Slave ID: 1 Function: 03 (Read Holding Registers) Start Address: 40001 (Register 0) Length: 2 No user manual is provided from the seller; using the default settings or adjusting the configuration on your end is recommended.