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RS485 communication Modbus protocol air quality sensor 7-in-1 formaldehyde CO2 TVOC PM2.5 temperature and humidity

Q: Private Control Protocol:

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modbus Technical Team

August 28, 2026 约 7 min read

RS485 communication Modbus protocol air quality sensor 7-in-1 formaldehyde CO2 TVOC PM2.5 temperature and humidity

RS485 communication Modbus protocol air quality sensor 7-in-1 formaldehyde CO2 TVOC PM2.5 temperature and humidityFigure

Function Introduction:

Detect temperature, humidity, carbon dioxide, formaldehyde TVOC, PM2.5, PM10, The detection data is output through the bus protocol to the central control device for control or display in the APP.

Usage occasions:

Widely applicable to users with air testing needs such as homes, kitchens and bathrooms, office buildings, hotels, hospitals, schools, stations, museums, exhibition centers, factories, agriculture, etc. It is also suitable for indoor air testing institutions, air purifiers, and fresh air system practitioners, Geek, Environmental players, environmental testing professionals, and other professionals use it.

Product Parameters:

RS485 communication Modbus protocol air quality sensor 7-in-1 formaldehyde CO2 TVOC PM2.5 temperature and humidityFigure1

Product Functions:

Connecting to the APP to view data is simple and convenient.
can be paired with an expansion module to send custom bus data under different air conditions
. Multiple intelligent accessories can be used to achieve personalized linkage control in different scenarios.
Remote control, on/off at any time (needs to be used with intelligent control system)
Supports timed on/off (needs to be used with intelligent control system)
Supports voice controlled on/off (needs to be used with intelligent control system or offline voice control module). Network disconnection does not affect control and display within the bus range.
· Simultaneously output temperature, humidity C02, Seven sets of data including formaldehyde, TVOC, PM2.5, and PM10. The PM2.5 sensor uses laser scattering principle. The air scatters the laser by measuring the suspended particles in the air through the measurement chamber. The scattered laser light is collected at a specific angle to obtain the curve of the scattered light intensity over time. The microprocessor calculates the equivalent particle size of the particles and the number of particles of different sizes per unit volume based on the Mie theory, achieving accurate measurement. Unique laser self calibration technology ensures accuracy.
adopts dual frequency data acquisition technology, which can detect the current particle concentration in real time. The range of particle diameter detection is from 0.3um to 10pm.
· PM2.5 is based on TS18530 as the standard, which is consistent with most measurement bureau testing equipment. CO2 adopts infrared non dispersive principle, single pass NDIR method, and has 24-hour self calibration function. Formaldehyde TVOC adopts electrochemical principle, with high sensitivity and low concentration recognition.
Temperature adopts NTC principle, humidity adopts HIH principle, with a wide measurement range and high accuracy. The three-dimensional air duct design improves the air flow rate and accurately identifies the particle content. The sensor adopts a metal shielding shell with good anti-interference performance.