Features： 1、New infrared calibration technology for CO2 concentration measurement with high accuracy, small drift and long life. 2、485 communication, for ModBus-RTU standard communication protocol, communication address and baud rate can be set, the longest communication distance is 2000 meters. 3、The product adopts a wall-mounted waterproof case, which is convenient to install and has a high protection level. 4、It is widely used in agricultural greenhouse, flower cultivation, edible fungus cultivation and others that require CO2 and temperature and humidity monitoring. 5、The housing is made of high-quality material, which is not easy to be damaged, durable and can be used for a long time. Specification： Condition: 100% Brand New Item Type: CO2 Transmitter Model: RS-co2-N01-2 Material: PVC Protection Level: IP65 Measuring Range: 400-5000PPm Power Supply: 10-30V DC Average Current: <85mA CO2 Accuracy: ± (40ppm+3%F·S) (25℃) Stability: <2% F·S Non-linearity: <1% F·S Data Update Time: 2s Output Signal: 485 Product Size: Approx. 11.7 x 11.3 x 4.2 cm / 4.6 x 4.4 x 1.7 in Weight: Approx. 177g / 6.2oz Wiring Method: Line ColorDescription PowerBrownPower Supply Positive (10-30V DC) BlackPower Supply Negative CommunicationYellow485-A Blue485-B Basic Communication Parameters: Encoding8-bit binary Data Bits8 Bits Parity Check BitNo Stop Bit1 Bit Error CheckCRC (Redundant Cyclic Codes) Baud Rate2400bit/s, 4800bit/s, 9600bit/s can be set, factory default is 4800bit/s Interface Description: Wide voltage power input 10~30V is acceptable. When wiring the 485 signal line, please note that the two A\B lines cannot be reversed, and the addresses of multiple devices on the bus must not conflict. Common Problems and Solutions: Possible reasons why the equipment cannot connect to the PLC or computer: 1) The computer has multiple COM ports, and the selected port is incorrect. 2) The address is wrong, or there are devices with duplicate addresses (the factory default is 1). 3) Baud rate, check mode, data bit, stop bit are error. 4) The host polling interval and waiting for response time are too short, both need to be set above 200ms. 5) The 485 bus is disconnected, or the A and B wires are reversed. 6) If there are too many devices or the wiring is too long, power should be provided nearby, add a 485 intensifier, and increase the 120Ω terminal resistance. 7) The USB to 485 driver is not installed or damaged. 8) The equipment is damaged. Package List： 1 x Sensor 1 Bag x Accessories (2 x Screw, 2 x Nut)