1It integrates noise collection, PM2.5 and PM10, temperature, humidity and light, and is installed in the shutter box. 2The equipment adopts standard for MODBUS-RTU communication protocol, RS485 signal output, communication distance up to 2000 meters (measured). 3Small size, light weight, high quality UV resistant material, long service life. 4With high sensitivity probe, the signal is stable, the accuracy is high, and the anti-interference ability is strong. 5It has the characteristics of wide measuring range, good linearity, good waterproof performance, easy to use, easy to install and long transmission distance. 6PM2.5 and PM10 are collected at the same time, measuring range: 0-1000ug / m, resolution: 1ug / m, unique dual frequency data acquisition and automatic calibration technology, with a consistency of 10%. 7The light acquisition module adopts a sensitive probe with high sensitivity, and the light intensity range is 0-200000 LX. 8The special 485 circuit is adopted, the communication is stable, and the power supply is 10 - 30V wide voltage range. Condition: 100% Brand New Item Type: Temperature Humidity Sensor Material: Polyester Plastic Application: Widely used in measuring environmental temperature and humidity, noise, air quality, light and other occasions Weight: Approx. 670g / 23.6oz Size:Height: Approx. 16cm / 6.3in Bottom Width: 13cm / 5.1in Top Width: 15cm / 5.9in Interface Description: wide voltage power input range 10-30V Data Frame Format Definition: For Modbus RTU Communication Protocol Is Adopted, With The Format As Follows: Time Of Initial Structure 4 Bytes Address Code = 1 Byte Function Code = 1 Byte Data Area = N Bytes Error Check = 16 Bit CRC Code Time Of End Structure 4 Bytes Address Code: the starting address of the transmitter, which is unique in the communication network (factory default 0x01). Function Code: the instruction function indication sent by the host. This transmitter only uses function code 0x03 (read register data). Data Area: the data area is the specific communication data. Note that the high byte of 16bits data is in the front CRC Code: two byte check code. Common Problems and Solutions: Possible reasons for the device not 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 device is 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. v:* {behavior:url( default VML);}o:* {behavior:url( default VML);}x:* {behavior:url( default VML);}.shape {behavior:url( default VML);} Parameter DC Power Supply (Default) 10-30VDC Maximum Power Consumption RS485 Output 0.8W Precision