1New infrared calibration technology for CO2 concentration measurement with high accuracy, small drift and long life. 2485 communication, for ModBus-RTU standard communication protocol, communication address and baud rate can be set, the longest communication distance is 2000 meters. 3The product adopts a wall-mounted waterproof case, which is convenient to install and has a high protection level. 4It is widely used in agricultural greenhouse, flower cultivation, edible fungus cultivation and others that require CO2 and temperature and humidity monitoring. 5The housing is made of high-quality material, which is not easy to be damaged, durable and can be used for a long time.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: Wiring Method: Line Color Description Power Brown Power Supply Positive (10-30V DC) Black Power Supply Negative Communication Yellow 485-A Blue 485-B Basic Communication Parameters: Encoding 8-bit binary Data Bits 8 Bits Parity Check Bit No Stop Bit 1 Bit Error Check CRC (Redundant Cyclic Codes) Baud Rate 2400bit/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 AB 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 120 terminal resistance. 7) The USB to 485 driver is not installed or damaged. 8) The equipment is damaged. 1 x Sensor1 Bag x Accessories (2 x Screw, 2 x Nut)1. Please allow 0-2 cm error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.