1. Industrial grade product, high progress SHT20 temperature and humidity sensor, RS485 communication; 2. Standard MODBUS protocol and common protocol are integrated, users can choose communication protocol by themselves; 3. The baud rate can be set by yourself; The common protocol has an automatic upload function, and the upload rate can be set by yourself 4. The use of industrial-grade chips and high-precision imported SHT20 temperature and humidity sensors ensure excellent reliability, high precision and interchangeability of the product. Using RS485 hardware interface (with thunder protection design),the protocol layer is compatible with the standard industrial Modbus-Rtu protocol. This product integrates MODBUS protocol and common protocol. Users can choose communication protocol by themselves. Common protocol has automatic upload function. Working voltage: DC4-30V (the highest should not exceed 33V) Maximum power: 0.2W Working temperature: temperature -20℃+60℃, humidity 0%RH-100%RH Control accuracy: temperature ±0.3℃(25℃), humidity ±3%RH(25℃) Output interface: RS485 communication (standard MODBUS protocol and custom common protocol), see protocol description for details Device address: 1-247 can be set, the default is 1 Baud rate: default 9600 (users can set by themselves), 8-bit data, 1-bit stop, no parity size: 60x30x18mm Material:ABS colour:Black Package Contents: 2 x Temperature Humidity Sensor Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.