Infinite L-com SRAQ-D681-B User manual

LASER DUST / PARTICULATE SENSOR MODULE
User Guide for SRAQ-D681-B
Thank you for choosing L-com product. To ensure safe, accurate performance and product longevity, please take a moment to familiarize yourself
with this manual before powering the device. Please keep it handy for future reference. In case of any questions regarding the installation or use of
product, please call us at 800.341.5266.
Reach out to us at [e-mail] and visit our website at www.l-com.com
M_L-com_SRAQ-D681-B_11/2022_R1.0
1
Product Description
The SRAQ-D681-B is a particle concentration sensor that uses the principle of laser light scattering (MIE scattering) to determine the number of
particulate matter suspended in the air. The sensor can detect and calculate the presence of various sized particles ranging from 0.3 µm to 10 µm in
diameter. With a UART (TTL) output, the sensor has a resolution of 0.3 µm. Good for use in HVAC systems, air purifiers and general air quality
monitoring.
Features
 Fast response
 Wide detection range 0.3 µm to 10 µm
 0.3 µm resolution
 UART (TTL) output
 Zero error alarm rate
Applications
 HVAC Systems
 Clean rooms
 Handheld air quality monitors
 Air purifiers
 General indoor air quality monitoring

2
Technical Parameters
Mounting Diagrams
If the user wants to mount the sensor, there are two holes on sensor, can be mounted with glue or screw .
Parameter Index Unit
Measuring particle diameter 0.3~1.0 1.0~2.5 2.5~10 µm
Counting efficiency 50%·0.3 µm 98%@>= 0.5 µm -
Standard volume 0.1 L
Response time ≤10S
Working voltage 5 VDC V
Maximum operating current 120 mA
Standby current ≤200 µA
Data interface level L<[email protected] H>2[email protected] V
Working temperature range -20~50 °C
Working humidity range 10~85% (non-condensing) RH
Storage temperature range -20~65 °C
Storage humidity range 0~95% (non-condensing) RH
Mean time to failure ≥3 Year
Sr. No. Function Color
1VCC Red
2GND Black
3RXD Green
4TXD White
Wire Definition

3
Digital Interface
Data interface: 2 pin for the serial data communication interface, the use of universal asynchronous receiver and receiver (UART); 1 pin fo r
the control signal interface, the use of high and low level control, all the high average 3.3VTTL level.
Interface pin definition:
PIN1 VCC DC5V
PIN2 GND GND
PIN3 SET Set pin /TTL level @3.3V
PIN4 RXD Serial port receiving pin /TTL level @3.3V
PIN5 TXD Serial port to send the pin /TTL level @3.3V
PIN6 RESET Module reset signal /TTL level @3.3V
PIN7/8 NC NC
SET = 1 (High level) when the module works in a continuous sampling mode, the module at the end of each sampling after the sampling data, the
sampling response time is less than 600ms, the data update time is less than 2S.
SET = 0 (Low level) module to enter low power standby mode
The following table defines the data for the module(PMS3003): 24 bytes
The default serial baud rate: 9600Kbps
Check bit: no
Stop bit: 1
Start symbol 1 0 x 42 (fixed)
Start symbol 2 0 x 4d (fixed)
Frame length high eight bit ……
Frame length = 2 * 9 + 2 (Data + check bit)
Frame length low eight bit ……
Data 1 high eight bit ……
Data 1 indicates PM1.0 concentration, (CF = 1, standard particulate matter), Unit: µg/m3
Data 1 low eight bit ……
Data 2 high eight bit ……
Data 2 indicates PM2.5 concentration, (CF = 1, standard particulate matter), Unit: µg/m3
Data 2 low eight bit ……
Data 3 high eight bit ……
Data 3 indicates PM10 concentration, (CF = 1, standard particulate matter), Unit: µg/m3
Data 3 low eight bit ……
Data 4 high eight bit ……
Data 4 indicates PM1.0 concentration, (Atmospheric environment), Unit: µg/m3
Data 4 low eight bit ……
Data 5 high eight bit ……
Data 5 indicates PM2.5 concentration, (Atmospheric environment), Unit: µg/m3
Data 5 low eight bit ……
Data 6 high eight bit ……
Data 6 indicates PM10 concentration, (Atmospheric environment), Unit: µg/m3
Data 6 low eight bit ……
Data 7 high eight bit ……
Data 7 (Retain)
Data 7 low eight bit ……
Data 8 high eight bit ……
Data 8 (Retain)
Data 8 low eight bit ……
Data 9 high eight bit ……
Data 9 (Retain)
Data 9 low eight bit ……
Data and check high eight bit ……
Check code = Start symbol 1 + Start symbol 2 +……+ Date 9 low
Data and check low eight bit ……
Note: Collecting data is data for atmospheric environment. Data 4 = PM1.0 Data 5 = PM2.5 Data 6 = PM10.
This module can be directly connected to the computer, the data line driver for CH340, please download the corresponding drive file according to
different system.