meersens mBox Guardian MMG-173 User manual

INSTALLATION GUIDE
mBox Guardian
Indoor monitor
MMG - 173
www.meersens.com

1
Kit Content:
•Air quality monitor: CO2, PM2.5, TVOC, temperature, humidity
•Power cable
•Power adapter
•Manual
•A wall mounting bracket
•4 fixing screws
Other material needed for the installation:
•On the wall, an electrical outlet with or without a ground connection near where
the mBox Guardian will be installed (<1m).
Positioning of the station:
Be sure to position mBox Guardian:
•On one of the walls of the room.
•At a height between 1 and 2 m corresponding as much as possible to the height
of the respiratory tract of people occupying the premises (children, adults,
seated people mostly ...).
•Out of draughty areas (air intake or exhaust, door, window).
•Away from heat sources (radiator, direct sunlight).
•Away from specific and localized sources of pollution (kitchen, garbage can,
changing area, perfume diffuser...)
•More than 1m from the corners of the room.

2
Product:
Introduction
mBox Guardian MMG-173 is an intelligent air comprehensive index monitor. It can
monitor PM2.5 concentration, temperature, humidity, carbon dioxide (CO2) and TVOC
which basically covers various indicators reflecting air quality. Remote data viewing
and intelligent management can be performed through Meersens SaaS and app. The
product adopts RS-485 (through the international universal ModBus RTU protocol)
communication interfaces which is convenient for users to quickly integrate into
existing systems. Here is also a Wi-Fi function and help you check its real time data at
anytime and anywhere on your cellphone via Meersens Pro App after Wi-Fi pairing.
Installation:
Position
mBox Guardian MMG-173 can be installed on the ceiling or wall, can be directly
connected to the wall with a 86 ×86 mm base, 220V Alternating Current. If there are no
86 × 86 mm base, can also be used directly with a screw fixed base.
Methods
•Firstly, fix the mounting plate on the wall, the mounting plate is shown in the
figure, and the fixing card is outward.
•After the device is connected to the cable, fix it on the mounting plate and turn
it clockwise to lock it.

3
Wi-Fi pairing settings:
After receiving an email with your login information and downloading the Meersens
Pro application, you can begin the pairing process.
Attention : this network must be a Wi-Fi 2.4 GHz. During the peering process, please
ensure that your phone and the sensor are within 5 meters of the Wi-Fi router. Also make
sure that your phone is connected to the same Wi-Fi 2.4GHz network before starting the
peering process.
1. Plug your MMG-173 sensor to a power
source close to the WIFI router. Then go
to the Meersens Pro app and scroll
down to the "deployed sensors" section.
Once in the section, add a sensor by
clicking on the “+”icon located on the
top right.
2. Select the model “MMG-173” in the
dropdown list.
3. Choose the name of the sensor to
identify it more easily later on (example:
meeting room) and scan the QR code on
the right side of the product using
Meersens Pro App. If you are unable to
scan, please enter serial number and
MAC address manually according to the
label on the product.
1
2
3

4
4. Select the sensor current location
5. Enter WIFI network credentials (name and password) at the Peering step.
Important: your phone must be connected to the network you are connecting
the sensor to.
Once paired, the sensor can safely be positioned further than 5 meters from the WIFI
router.
6. Long press the white circular button in the middle of the device for more than 3
seconds. Press the "Pairing" button (on the app) once the light button starts
blinking fast (on the sensor).Wait for the peering procedure to complete
successfully. Your device is now paired. Click on “Declare new sensor” button
to finish the procedure. The first data will appear within 10 minutes.
(Please note that you might have to try again the Peering step another time in case the
first time fails).
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5
6

5
Light Display:
Identification of the light display:
Configuration state:
•Blue light flashing 1 seconds interval
Light working state:
•Rotating, it is detecting
•Breathing, it is sleep mode
•During sleep mode, short press tue button to start detection, press again to turn
off the display light
Light color :
Methods
•Firstly, fix the mounting plate on the wall, the mounting plate is shown in the
figure, and the fixing card is outward.
•After the device is connected to the cable, fix it on the mounting plate and turn
it clockwise to lock it.

6
Settings for Modbus RTU communication:
Device address setting:
•if there is only one MMG-173, there’s no need to set up.
•otherwise, if there is many MMG-173 devices that want to access to the RS-485
bus, please set up the device address by adjusting the address dial switch
•it can be set by a low 5 bit address code switch presented as below, high 3
through RS-485 bus extension. The most significant bit corresponds to the
leftmost switch (identified by the number 1), and the least significant bit
corresponds to the rightmost switch (identified by the number 5)
•Example : the address of the is:
Bus protocol:
Modbus Fieldbus physical interface: RS-485
Baud rate: 9600bps
Byte format: 1 start bit, 8 data bits, 1 stop bit
Address Dial Switch : 24×0+23×1+22×0+21×0+20×1=9

7
Register description:
Register
Address
Word
Length
Meaning
Unit
Read/
Write
Remark
0x0000
1 word
PM2.5
µg/m3
R
0 to 999 µg/m3
0x0001
1 word
Temperature
0.1°C
R
- 40 to 125°C (negative is
complement)
0x0002
1 word
Humidity
0.1%RH
R
0 to 100% RH
0x0003
1 word
CO2
ppm
R
0 to 9999 ppm
0x0004
1 word
TVOC
0.01mg/m3
R
0.22 to 9.99 mg/m3
0x0005
1 word
On-Off state
R
Off = 0x4F
On = 0x40
0x000A
1 word
Light On-Off
control
RW
Off = 0x4F
On = 0x40
0x000B
1 word
Modbus add
extension code
RW
0 to 7
0 by default
0x000C
1 word
Detecting
interval
minute
RW
1 to 240min
10 by default
0x000D
1 word
Program
version
R
Major version: highest
byte
Minor version: lowest
byte
Read function code is 0x03 and Write function code is 0X06.
Communication examples:
PM2.5 request:
PM2.5 reading returned from slave is 125ug/m3:
Temperature and humidity request:
Byte number
0
1
2
3
4
5
6
7
Instruction
Device
Adress
Function
Code
Address
Register MSB
Adress
Register LSB
Number of
Data MSB
Number of
Data LSB
CRC
LSB
CRC
MSB
Data
0x01
0x03
0x00
0x00
0x00
0x01
0x84
0x0A
Byte number
0
1
2
3
4
5
6
Instruction
Device
Adress
Function
Code
Number of bytes
PM2.5 MSB
PM2.5 LSB
CRC LSB
CRC MSB
Data
0x01
0x03
0x02
0x00
0x7D
0x78
0x65
Byte number
0
1
2
3
4
5
6
7
Instruction
Device
Adress
Function
Code
Address
Register MSB
Adress
Register LSB
Number of
Data MSB
Number of
Data LSB
CRC
LSB
CRC
MSB
Data
0x01
0x03
0x00
0x01
0x00
0x02
0x95
0xCB

8
Temperature and humidity returned from slave is -10.5°C and 23.6% RH:
Host controls slave, start detection:
Slave returned value:
Host controls slave, detection interval = 30 minutes :
Slave returned value:
Host request reading program version number:
Version number returned value is V2.6:
Illegal data returned:
Byte
number
0
1
2
3
4
5
6
7
8
Instruction
Device
Adress
Function
Code
Number
of bytes
Temperature
MSB
Temperature
LSB
Humidity
MSB
Humidity
LSB
CRC
LSB
CRC
MSB
Data
0x01
0x03
0x04
0xFF
0x97
0x00
0xEC
0x7A
0x46
Byte number
0
1
2
3
4
5
6
7
Instruction
Device
Adress
Function
Code
Address
Register MSB
Adress
Register LSB
Number of
Data MSB
Number of
Data LSB
CRC
LSB
CRC
MSB
Data
0x01
0x06
0x00
0x0A
0x00
0x40
0xA8
0x38
Byte number
0
1
2
3
4
5
6
7
Instruction
Device
Adress
Function
Code
Address
Register MSB
Adress
Register LSB
Number of
Data MSB
Number of
Data LSB
CRC
LSB
CRC
MSB
Data
0x01
0x06
0x00
0x0A
0x00
0x40
0xA8
0x38
Byte number
0
1
2
3
4
5
6
7
Instruction
Device
Adress
Function
Code
Address
Register MSB
Adress
Register LSB
Number of
Data MSB
Number of
Data LSB
CRC
LSB
CRC
MSB
Data
0x01
0x06
0x00
0x0C
0x00
0x1E
0xC9
0xC1
Byte number
0
1
2
3
4
5
6
7
Instruction
Device
Adress
Function
Code
Address
Register MSB
Adress
Register LSB
Number of
Data MSB
Number of
Data LSB
CRC
LSB
CRC
MSB
Data
0x01
0x06
0x00
0x0C
0x00
0x1E
0xC9
0xC1
Byte number
0
1
2
3
4
5
6
7
Instruction
Device
Adress
Function
Code
Address
Register MSB
Adress
Register LSB
Number of
Data MSB
Number of
Data LSB
CRC
LSB
CRC
MSB
Data
0x01
0x03
0x00
0x0D
0x00
0x01
0x15
0xC9
Byte number
0
1
2
3
4
5
6
Instruction
Device
Adress
Function
Code
Number of bytes
Major
Version
Minor
Version
CRC LSB
CRC MSB
Data
0x01
0x03
0x02
0x02
0x06
0x39
0x26
Byte number
0
1
2
3
4
Instruction
Device
Adress
Function
Code
Error code
CRC LSB
CRC MSB
Data
0x01
0x83
0x01
0x80
0xF0

9
Precautious:
•Wall-mounted, pay attention to the installation direction, and the arrow points
upward 2. The default data detection interval of the device is 10 minutes. If the
air in the environment changes suddenly, the device may not respond
immediately.
•The terminal is connected to 180 ~ 240VAC. Exceeding the specified range or
incorrect connection will permanently damage the equipment.
•During the PM2.5 detection process, there will be a slight motor sound. This
sound is normal and will not produce noise interference.
Use environment:
•This product is suitable for indoor use.
•Do not use this product in an environment with extreme temperature and
humidity.
•Do not use this product for a long time in a severe dust pollution environment
to avoid errors in the monitoring results.
•Do not subject the product to strong shocks and vibrations (such as dropping it
from a high place).

www.meersens.com
Meersens is a DeepTech artificial intelligence company specialized in the aggregation
and processing of exposome data in order to help and support communities,
companies involved in CSR issues and health professionals in taking into account the
impact of the environment on the medical condition of individuals. Through its
solution, Meersens acts for Public Health and is part of a virtuous process for the
implementation of advice, prevention actions and decision support in close
collaboration with specialists in the fields concerned.
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8 avenue Maréchal Foch, 69006 Lyon
RCS Lyon : 932 811 392 00014
[email protected]
www.meersens.com