Feature: 1. MAIN PURPOSE: To accurately control and provide feedback by reading the temperature and humidity values of AHT20. 2. EASY TO USE: Supports for RTU protocol and can be controlled and collected through RS485 communication. 3. ACCURATE AND SENSITIVE: Our temperature humidity sensor provides accurate readings and quick response to maintain optimal comfort and prevent damage. 4. WIDELY USED: Suitable for PLC control systems, NTC thermistor sensors, constant temperature controllers, industrial systems, touch panels, thermometers, thermal sensitive systems, temperature and humidity in vegetable gardens, and more. 5. EASY INSTALLATION: With a small size and a light weight as well, this humidity sensor can be easily installed for putting into use soon. Specification: Item Type: AHT20 Temperature Humidity Sensor Material: ABS Working Voltage: DC 4.5-15V Working Current: 4-7MA Communication Protocol: For RTU protocol, 03, 04 read instructions, 06, 16 write instructions. Serial Port Baud Rate: 9600 (default), no parity, 8 data bits, 1 stop bit. Device Address: The default is 0 x 01. By modifying the 485 address, a maximum of 247 modules can be cascaded (if there are more than 16, please use RS485 repeaters). Function: Read the temperature and humidity values of AHT20 AHT20 Sensor Specifications: Item Type: AHT20 Temperature and Humidity Sensor Temperature Accuracy: The typical value is ± 0.3 ℃, and the maximum value is ± 1.5 ℃. Temperature Range: -40 ℃ to +85 ℃ Humidity Accuracy: ± 2% RH, maximum ± 6% RH Humidity Range: 0 to 100 percent RH. Package List: 1 x AHT20 Temperature Humidity Sensor