1The new infrared calibration technology is used to measure the CO2 concentration with high accuracy and long service life. 2Support 485 communication, standard Modbus-RTU communication protocol, communication address and baud rate can be set, the farthest communication distance is 2000 meters. 3The shell is made of high quality PVC material, which is durable, wear-resistant and corrosion-resistant. 4Wide measuring range, with temperature compensation function, little affected by temperature. 5Wall mounted installation is adopted, with simple installation method, protection grade of IP65 and high reliability. 6It is widely used in agricultural greenhouse, flower culture, mushroom planting and other occasion requiring CO2 and temperature and humidity monitoring.Condition: 100% Brand New Item Type: CO2 Transmitter Material: PVC Power Supply: 10-30V DC Average Current: Line Color Description Power Supply Brown Power Supply (10 - 30V DC) Black Negative Power Communication Yellow 485-A Blue 485-B Basic Communication Parameters: Code 8-Bit Binary Data Bit 8-Bit Parity Bit No Stop Bit 1 Person Error Checking CRC (Redundant Cyclic Code) Baud Rate 2400bit / s, 4800bit / s, 9600 bit / s can be set, the factory default is 4800bit / s Common Problems and Solutions: Possible reasons for the toolnot being able to connect to the PLC or computer: 1. The computer has multiple COM ports. The selected port is incorrect. 2. The address of the toolis wrong, or there are devices with duplicate addresses (factory default is 1). 3. Baud rate, verification mode, data bit, stop bit error. 4. The host polling interval and waiting time are too short, which need to be set above 200ms. 5.485 bus is disconnected, or a and B wires are connected reversely. 6. If the number of equipment is too large or the wiring is too long, the power shall be supplied nearby, 485 intensifier shall be added, and 120 terminal resistance shall be added at the same time. 7. The usb-485 drive is not installed or damaged. 8. The equipment is damaged. 1 x CO2 Sensor1 x Bag of Accessories (2 x Screws, 2 x Screw Cap)1.Please allow 0-1 inch err