1、High Performance: This product adopts high accurate sensor, which has the characteristics of wide measurement range, good linearity, good versatility, convenient use, long transmission distance. 2、Accurate Temperature and Humidity Acquisition: Temperature acquisition, accurate measurement, the range can reach ‑40℃ to 80℃. Humidity acquisition, the range can reach 0‑100%RH, and the measurement accuracy is high. 3、Wide CO2 and Pressure Range: CO2 measurement range is wide, there are multiple ranges to choose from. Wide range of 600‑1100HPa pressure range, can be used in various environments. Can measure PM5 and PM10 concentrations at the same time. 4、Wide Application: The wall mounted multi element transmitter can be widely used in various environmental monitoring, can monitor a variety of elements, and has a variety of signal output methods. 5、Convenient to Use: 10‑30V DC wide voltage range power supply. It is convenient for use in various environments, safe and reliable, beautiful in appearance, easy to install, and durable. 1 x Expansion Tube4 x Screw1 x Transmitter1 x Instruction Item Type: Temperature and Humidity Transmitter  Material: PlasticWeight: Approx. 194g/ 6.84ozSize: 110x70x38mm/ 4.33x 2.76x 1.50inCoding: 8 bit binaryData Bits: 8 bitsParity Bit: NoneStop Bit: 1Error Checking: CRC (Redundant Cyclic Code)Baud Rate: 400bit/s, 4800bit/s, 9600 bit/s can be set, the factory default is 9600bit/sDC Power Supply (Default): 10 to 30V DCPower Consumption: ≤ 1.2W（12V DC, 25℃）Average Current: ＜85mATransmitter Circuit Working Temperature And Humidity: -40℃ to +60℃, 0%RH-95%RH non condensingTemperature Measurement Range: -40℃ to +80℃Temperature Measurement Accuracy: ± 0.5℃Humidity Measurement Range: 0-100%RHHumidity Measurement Accuracy: ±3%RHAir Pressure Measurement Range: 600-1100HPaBarometric Pressure Measurement Accuracy: ± 0.5HPaCO2 Measurement Range: 0-5000, 10000ppm（Default range 0-5000）CO2 Measurement Accuracy: ±20ppmPM 2.5/10 Measuring Range: 0-1000ug/m³PM 2.5/10 Measurement Accuracy: ＜read numbers±10%(25℃)Output Signal: 485 signalStability: ＜2%FSNonlinear: <1%FSResponse Time: ≤120SWiring Instructions:Power Supply: thread color: Brown, instruction: V+; thread color: black, instruction: V-Communication: thread color:yellow, instruction:485A; thread color: blue, instruction:485BApplication: Widely used in various environmental monitoring, can monitor a variety of elements, and has a variety of signal output methods, which is convenient for use in various environments, safe and reliable, beautiful in appearance, easy to install, and durable.Common problems and solutionsThe device cannot be connected to the PLC or computerPossible reason:1) The computer has multiple COM ports, and the selected port is incorrect.2) The device address is wrong, or there are devices with duplicate addresses (the factory default is all 1).3) Baud rate, check mode, data bit, stop bit error.4) The 485 bus is disconnected, or the A and B lines are reversed.5) If the number of devices is too large or the wiring is too long, power supply should be provided nearby, add a 485 booster, and at the same time increase a 120Ω terminal resistance.6) The USB to 485 driver is not installed or damaged.