Descriptions: The product adopts industrial-grade chip and high precision temperature and humidity probe to ensure the excellent reliability, high precision and interchangeability of the products. RS485 hardware interface (with lightning protection design), the protocol layer compatibility standard industry Rtu protocol. Features: The product adopts industrial-grade chip and high precision temperature and humidity probe to ensure the excellent reliability, high precision and interchangeability of the products. Adopted of RS485 hardware interface (with lightning protection design), the protocol layer compatibility standard industry Rtu protocol. Automatic output, connection RS485 through serial debugging tool will automatically output temperature and humidity. This sensor 's working voltage is 9-36v, maximum power is 0.3W. Relatively wide operating temperature and humidity, and features high accuracy temperature± 0.3 ℃ (25 ℃), humidity ± 3% RH (25 ℃). Specifications: Working voltage: 9-36V Maximum power: 0.3W Operating temperature: -20 ℃ ~60 ℃, humidity 0% RH~80% RH Accuracy: Temperature ± 0.3 ℃ (25 ℃), humidity ± 3% RH (25 ℃) Output interface: RS485 (standard Rtu protocol) Device address: can be set to 1-255, the default is 1 Baud rate: 9600, 8 bits of data, 1 stop, no parity Size: as the picture Weight: 49g Wiring instructions: Yellow: power supply"+" Black: power supply "-" Red: 485-A Green: 485-B Package Included: 1 x RS485 Temperature and Humidity Transmitter Sensor