RS485 MODBUS-RTU Protocol Carbon Monoxide Transmitter Power Supply Reversible Industrial Sensor Gas Detection Air Quality Monitoring WTR10 gas transmitter, using high-precision digital sensor, reliable performance, high precision, small annual dirft, fast speed. RS485 bus technology, based on industrial MODBUS-RTU protocol, is a practical integrated sensor for on-line monitoring of gas status. Features: High precision digital sensor, high sensitivity, good stability, full automatic temperature compensation. MCU adopts STC company's professional and leading high-quality low-power chip to ensure processing capability and stability. Standard RS485 output, can achieve long-distance communication. Various standards for use of Modbus-RTU communication protocols in the industrial field. There is power conservation function, no positive and negative electrode distinction, can be connected; With lightning conservation function; Note communication: (RS485A/RS485B requires correct connection and cannot be reversed). Installation Method: WTR10 is a high-precision gas transmitter with an attractive and compact appearance, standard rail structure design, easy to install, can also be installed indoors, ceiling mounted. Application Area: Can be used in industrial field measurement, telecommunication base station, production workshop, warehouse, agricultural greenhouse, hospital, laboratory, hotel, on-site measurement and other occasions. Specifications: Model: WTR10-A / WTR10-B (Optional) WTR10-A (Carbon monoxide transmitter) Range: 0-999PPM Accuracy: ≤soil 0.5ppm or soil 5% test value is maximum Operating Temperature: -20~50℃ WTR10-B (CO₂ transmitter) Range: 400-5000PPM Accuracy: Soil 50ppm Operating Temperature: -20~50℃ Material: ABS Power Supply Range: DC9V-40V Communication Output Interface: RS485 Baud Rate: 2400, 4800, 9600, 19200 Set by yourself  (Set the baud rate command BPS=0: baud rate 2400; BPS=1: baud rate 4800; BPS=2: baud rate 9600; BPS=3: baud rate 19200), the default baud rate is 9600 Byte Format: 8 data bits, 1 stop bit, no check Communication Protocol: Modbus-RTU The communication address can be set: 1-253, the address default 1, (set the address command ADR=1 address 1; ADR=2 address 2; ADR=3 address 3; And so on) Installation Method: Guide rail installation Item Size: 65 * 45 * 28.5mm / 2.56 * 1.77 * 1.12in Item Weight: 40g / 1.41oz Package Weight: 45g / 1.59oz Package Size: 12.8 * 12.8 * 3cm / 5.04 * 5.04 * 1.18in Package List: 1 * Gas Transmitter 1 * User Manual (English)