Magnum M9-IAQS User manual
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Indoor Air Quality Monitor & Data Logger
M9-IAQS
M9-IAQS is an indoor air quality controller with screen provides customers with visual indoor air quality readings,
such as PM2.5, CO2, temperature, humidity, etc.; It can control the HVAC system directly. For example: Adjust the
fan speed, control air supply / exhaust，set mode and other functions. It is widely used in residential, commercial
and industrial applications, and can effectively improve air quality and create a healthy, comfortable,
efficient, environmentally friendly, energy-saving living and working environment.
▪Compatible with embedded and wall-mounted fixing methods;
▪Compatible with push-button and touch-screen operation;
▪Using standard 86 box size, thickness <24mm;
▪PM2.5, CO2, RH&T etc., multiple sensors can be optionally selected.
▪With fresh air control function, three level speed of wind can be adjusted, four working modes: intelligent,
manual, mute, and periods.
▪Customizable filter alert function.
▪The built-in dust sensor uses the principle of laser scattering technology to detect the indoor PM2.5 mass
concentration in real time（μg/m³）;
▪The built-in carbon dioxide sensor uses the principle of NDIR technology to detect indoor CO2 concentration in real
time (ppm);
▪The RH&T sensor use capacitor resistance material to detect the indoor temperature (° C) and humidity (%) in real
time.
Applications
▪Residential ventilation system
▪Business ventilation system
▪Industrial ventilation system
Description
Features
Working Principle
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Specifications
Specifications
Working principle
CO2：NDIR
PM：Laser scattering principle
Measurement range
PM2.5：0~1000μg/m³
CO2：0~5000ppm
Tem pe rat ur e：-10℃~50℃
Humidity：0%~95%RH
PM2.5 Measurement accuracy
≤ 100μg/m³：±10μg/m³
> 100μg/m³：±10% reading
（Reference Instrument TSI 8530，25±2℃，50±10%RH）
CO2 Measurement accuracy
±（50ppm+5% of reading）@ 0~50℃
Tem pe rat ur e Measurement
accuracy
±1℃
Humidity Measurement accuracy
±8%RH
PM Response time T90
≤8s
CO2 Response time T90
<120s
Working condition
-10~50℃，0~95%RH(Non-condensing)
Storage condition
-20~60℃，0~95%RH(Non-condensing)
Working voltage
12V DC(24V DC available)
Working current
<140mA
Standby current
≤90mA
Signal Output
RS485
Installation hole distance
60mm（standard）
Dimension
86*86*24.9 mm
Lifetime
PM：≥5 years
CO2：≥10 years
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Dimensions and Interface Definition
1. Dimensions (Unit
：
mm, tolerance
：
±0.2 mm)
2. Pin definition
No.
Pin
Description
1
TA
Communication port（RS485_TA）
2
TB
Communication port（RS485_TB）
3
+12V
Power input（+12VDC/24VDC available）
4
GND
Power input（GND）
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UI Interface Description
Parameter Range corresponding to color LIST
Gas
Level
Range
Color
PM2.5
(μg/m³)
Good
0~75
Just so so
75~115
Bad
≥115
CO2
(ppm)
Good
0~600
Just so so
600~1000
Bad
≥1000
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Controlling Instructions
1 Working Mode
nManual Mode: The user can adjusts the fan speed switch manually (high, middle and low);；
nIntelligent Mode: According to the setting value of PM2.5 or CO2, it can switch the fan speed automatically.
nMute Mode: Operation at low speed;
nPeriods Mode: The user can set different fan speed in four periods within 24 hours (00: 00 ~ 06: 00, 06: 00 ~
12: 00, 12: 00 ~ 18: 00, 18: 00 ~ 24: 00)
2 Key’s Function
n：Power-on Key(long press for 2s);
n：Fan speed key, switch the fan speed(high, medium, low), the default is low speed when power on;
n：Confirmation key (use in confirm operating or standby mode setting);
n：Function key (adjust the fresh air and exhaust air). There are three status: “exhaust air”, “fresh air”, and
“fresh air + exhaust air”; Default is “fresh air + exhaust air”
n：Mode key (WIFI key also). There are four modes: manual, intelligent, mute, and periods. Default is
manual mode. Long press till the buzzer off then is WIFI status.
3 Operation Instructions
1 Switch on and off: press and hold the for 2s to turn on or off. When it’s the switch off status, all readings
and output will off.
2 Switch the operating mode: Press the to change the operating mode. The working mode is cyclically
switched in the four states of "periods-intelligent-manual-mute". After the mode setting is completed, press the
the screen returns to the data detection interface.
3 Time period mode: Press the operating mode key and the confirmation key, the user can set the fan speed by
for 4 time periods per day (00: 00 ~ 06: 00, 06: 00 ~ 12: 00, 12: 00 ~ 18: 00, 18: 00 ~ 24:00).
Note：This time period used for setting fan speed
For example：Setting Monday
00:00 Low
06:00 Medium
12:00 High
18:00 Low
By this logic, the fan speed be set to low speed from 00:00 to 06:00; and it be set to medium speed from 06:00
to 12:00, high speed from 12:00 to 18:00.
4 Intelligent Mode：
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①Without CO2 sensor: the controller automatically adjusts the fan speed according to the air quality (PM2.5
concentration); when the PM2.5 concentration is higher than the set value of 115μg / m³, the fan runs at high
speed; when the PM2.5 concentration is between 75-114μg / m³, the fan runs at medium speed; when the PM2.5
concentration is lower than the set value of 75 μg / m³, and the fan runs at low speed.
②With CO2 sensor: When the CO2 concentration is higher than the set value of 1000ppm, fan will run at high
speed, when the CO2 concentration value is between 600-999ppm, the fan runs at medium speed, and when the
CO2 concentration is lower than the set value of 600ppm, and the fan runs at low speed.
5 Manual mode: The fan speed switched by the user. Despite the time period and air quality. The fan speed can
be adjusted by the . The adjustment range is low-medium-high.
6 Mute mode: The fan runs at low speed and cannot switch the fan speed manually under this mode, and it’s
not affected by air quality.
7 Function setting: Press the to cycle the HVAC system through the three states of "exhaust air-fresh air-
fresh air + exhaust air", each time you press the key to switch one operating mode.
8 WIFI Connection:Long press till buzzer off , the WIFI icon become blue from red, then it starts connecting,
the icon will turn to white if it match your net successfully.
9 Standby Mode: After the controller is powered on, if there is no operation of setting any of the above working
modes and function settings, the controller will enter into the standby state after one minute. After a short press of
the key, the product enters the data detection interface.
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Step 1: Fix the wall mounted bracket with screws on the 86 box which in the embedded wall, as shown below
Step 2: Connecting Cable, connect the corresponding cable to the controller's RS485 interface according to the
interface definition, as shown below:
Step 3: Match the two holes in the controller with the hooks in the wall mount bracket and slide the controller down to
ensure that the controller is tightly locked with the bracket.
Installation Instructions
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▪Do not place the controller in an environment where the ambient temperature is too high (above 60 ° C) or too low
(below -20 ° C).
▪Keep it out of reach of children as much as possible to prevent injury from collision and fall.
▪Do not drop the controller or rub it against hard objects during use, otherwise it may cause damage to the
controller's external light and damage.
▪Do not place the controller in a dusty environment to avoid dust accumulation in the controller and affect the
measurement accuracy.
▪When using the controller, do not cover or block the vent hole with any object to avoid affecting the air quality
monitoring.
▪Do not disassemble, repair or modify the controller without permission.
Precautions for use
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1) The M9-IAQS controller is connected to the HVAC controller through 485, it sends a command to the
HVAC controller to achieve the AM6108 control the HVAC system by communication protocol.
2) Baud rate：9600, Data Bits: 8, Stop Bits: 1, Parity: No；
3) Communication distance ≤ 2km; and we suggest the terminal impedance be 120Ω, 1 / 2W.
Sending format of test software:
Start Symbol
Length
Command
IP Address
Data1
……
Data n
Check Sum
HEAD
LEN
CMD
ADD
DATA1
……
DATAn
CS
11H
XXH
XXH
XXH
XXH
……
XXH
XXH
Detail description on protocol format:
Protocol Format
Description
Start Symbol
Sending by controller is fixed as [11H]
Length
Length of frame bytes= data length +2 (including CMD+IP+DATA)
Command
Command is fixed as [55H]
Address
Controller address is （1～254，default is [01H]）
Data
Data of writing or reading, length is not fixed
Check Sum
Cumulative sum of data = 256-(HEAD+LEN+CMD+IP+DATA)
The system's default slave device address is 01H, the controller command is 55H, and the command format is as
below:
11 10 55 01 DF1 DF2 DF3 DF4 DF5 DF6 DF7 DF8 DF9 DF10 DF11 DF12 DF13 DF14 CS
Slave response
16 02 55 01 CS
Name
Data
Description
Note
Mode
DF1
0x00 Periods Mode
0x01 Intelligent Mode
0x02 Manual Mode
0x03 Mute Mode
0x01 Low
3. Controller Command
1. General Statement
4. Command Table of Serial Protocol
2. Format of Serial Communication Protocol
Communication Protocol
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Fan Speed Mode
DF2
0x02 Medium
0x03 High
Air Switch（For fresh
air and air exhaust）
DF3
0x00 air exhaust switch
off and fresh air switch on
0x01 air exhaust switch
on and fresh air switch off
0x02 air exhaust switch
on and fresh air switch on
Indoor PM2.5
Concentration
DF4- DF5
0--1000
μg/m³
Indoor CO2
Concentration
DF6- DF7
0--5000
ppm
Indoor Temperature
DF8- DF9
0--600
(Corresponding value -100) /
10 ° C (-10.0-50.0), one
decimal place is reserved
Indoor Humidity
DF10
0--95
0-95 %
Indoor HCHO
Concentration
DF11- DF12
Reserved
Indoor VOC lever
DF13-DF14
DF4=0x01 VOC L1
DF4=0x02 VOC L2
DF4=0x03 VOC L3
(1-3)
Error code
DF15- DF16
Reserved
Reserved
DF17- DF18
Reserved
DF19- DF20
CheckSum
CS
After-Sales Services and Consultancy
Magnum First Corporation
370 Falls Commerce Parkway
Cuyahga Falls, OH 44224
716-293-1588
www.MagnumFirst.com
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