Intesis EIA-485 User Manual
Compatible with VRF and Commercial lines
USER MANUAL
Issue date: 03/2021 r1.4 ENGLISH
Intesis® INMBSMID---I000
User’s Manual r1.4 EN
© HMS Industrial Networks S.L.U - All rights reserved
This information is subject to change without notice
URL https://www.intesis.com
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Modbus RTU (EIA-485) Interface for Midea
air conditioners
Compatible with VRF and Commercial lines
ORDER CODE
LEGACY ORDER CODE
INMBSMID001I000
MD-AC-MBS-1
INMBSMID004I000
MD-AC-MBS-4
INMBSMID008I000
MD-AC-MBS-8
INMBSMID032I000
MD-AC-MBS-32
Intesis® INMBSMID---I000
User’s Manual r1.4 EN
© HMS Industrial Networks S.L.U - All rights reserved
This information is subject to change without notice
URL https://www.intesis.com
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Important User Information
Disclaimer
The information in this document is for informational purposes only. Please inform HMS Industrial
Networks of any inaccuracies or omissions found in this document. HMS Industrial Networks disclaims any
responsibility or liability for any errors that may appear in this document.
HMS Industrial Networks reserves the right to modify its products in line with its policy of continuous
product development. The information in this document shall therefore not be construed as a commitment
on the part of HMS Industrial Networks and is subject to change without notice. HMS Industrial Networks
makes no commitment to update or keep current the information in this document.
The data, examples and illustrations found in this document are included for illustrative purposes and are
only intended to help improve understanding of the functionality and handling of the product. In view of
the wide range of possible applications of the product, and because of the many variables and requirements
associated with any particular implementation, HMS Industrial Networks cannot assume responsibility or
liability for actual use based on the data, examples or illustrations included in this document nor for any
damages incurred during installation of the product. Those responsible for the use of the product must
acquire sufficient knowledge in order to ensure that the product is used correctly in their specific
application and that the application meets all performance and safety requirements including any
applicable laws, regulations, codes and standards. Further, HMS Industrial Networks will under no
circumstances assume liability or responsibility for any problems that may arise as a result from the use of
undocumented features or functional side effects found outside the documented scope of the product. The
effects caused by any direct or indirect use of such aspects of the product are undefined and may include
e.g. compatibility issues and stability issues.
Intesis® INMBSMID---I000
User’s Manual r1.4 EN
© HMS Industrial Networks S.L.U - All rights reserved
This information is subject to change without notice
URL https://www.intesis.com
4 / 24
INDEX
1 Presentation ........................................................................................................ 5
2 Connection .......................................................................................................... 6
2.1 Connect to the AC indoor unit ........................................................................... 6
2.2 Connection to the EIA-485 bus .......................................................................... 6
2.3 Connection to the power supply ........................................................................ 6
2.4 Connection diagrams ....................................................................................... 7
3 Quick Start Guide ................................................................................................. 8
4 Modbus Interface Specification ............................................................................... 9
4.1 Modbus physical layer ...................................................................................... 9
4.2 Modbus Registers for INMBSMID001I000 ............................................................ 9
4.2.1 Control and status registers ..................................................................... 9
4.2.2 Configuration Registers .......................................................................... 11
4.3 Modbus Registers for INMBSMID004I000 / INMBSMID008I000 /INMBSMID032I00012
4.3.1 Global Control and status registers .......................................................... 12
4.3.2 Individual Control and status registers ..................................................... 13
4.3.3 Configuration Registers .......................................................................... 14
4.4 Considerations on Temperature Registers ......................................................... 15
4.5 DIP-switch Configuration Interface .................................................................. 17
4.6 Implemented Functions .................................................................................. 20
4.7 Device LED indicator ...................................................................................... 20
4.8 EIA-485 bus. Termination resistors and Fail-Safe Biasing mechanism ................... 21
5 Electrical and Mechanical features ......................................................................... 22
6 List of supported AC Unit Types ............................................................................. 23
7 Error Codes ........................................................................................................ 24
Intesis® INMBSMID---I000
User’s Manual r1.4 EN
© HMS Industrial Networks S.L.U - All rights reserved
This information is subject to change without notice
URL https://www.intesis.com
5 / 24
1 Presentation
The INMBSMID---I000 interface allows a complete and
natural integration of Midea air conditioners into Modbus
RTU (EIA-485) networks.
Compatible with VRF and Commercial lines.
Reduced dimensions. 93 x 53 x 58 mm
3.7” x 2.1” x 2.3”
• Quick and easy installation.
Mountable on DIN rail, wall, or even inside the indoor unit on some models of AC.
• External power required.
• Direct connection to Modbus RTU (EIA-485) networks. Up to 63 INMBSMID004I000 /
INMBSMID008I000 /INMBSMID032I000 devices can be connected on the same network.
INMBSMID---I000 is a Modbus slave device.
• Direct connection to the Midea XYE bus.
• Configuration from both on-board DIP-switches and Modbus RTU.
• Total Control and Supervision.
• Real states of the AC unit's internal variables.
• Allows simultaneous use of the AC’s remote controls and Modbus RTU.
• Individual control from 1 to 32 AC units with a single interface.
A Integration of single AC unit from independent XYE bus using INMBSMID001I000 interface
B Integration of multiple AC units in the same XYE bus using INMBSMID004I000 / INMBSMID008I000
/INMBSMID032I000 interface
• SCADA
• PLC
• DDC
• BMS
• HMI
•
Controller
• etc
Modbus RTU
Master device
INMBSMID001I000
Modbus RTU
EIA-485 network
INMBSMID---I000
Options
available:
N=1
N=4
N=8
N=32
AC Unit # 0
AC Unit # 1
AC Unit # N -1
B A Intesis® INMBSMID---I000
User’s Manual r1.4 EN
© HMS Industrial Networks S.L.U - All rights reserved
This information is subject to change without notice
URL https://www.intesis.com
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2 Connection
The interface comes with 3 plug-in terminal blocks of 2 poles.
The first (XY) is used to establish direct connection with the AC indoor unit. The second one
(V1V2) is used to provide power.
The third one (AB) is used to stablish connection with the Modbus RTU EIA-485 network.
2.1 Connect to the AC indoor unit
The INMBSMID---I000 connects directly to the Midea XYE bus. The cable for proper connection
is not provided with the interface. Maximum XYE bus length is 100 m (328.08 ft.).
Connector E, from the XYE bus, is not used to connect to the indoor unit or indoor units. The
XYE bus has specific polarity.
Depending on the number of AC units to control, the recommended connection’ methods can
be seen in Figure 2.1 and Figure 2.2.
NOTE: If a CCM Central Controller is present in the XYE bus, then the INMBSMID---I000
cannot be connected. Please, disconnect the CCM Central Controller for use of the gateway.
2.2 Connection to the EIA-485 bus
Connect the EIA-485 bus wires to the plug-in terminal block of the INMBSMID---I000 interface
and respect the polarity on this connection (A+ and B-).
Make sure that the maximum distance of the bus is 1,200 meters (3,937 ft.) in daisy chain set
up. Loop or star topologies are not allowed in the EIA-485 bus. A terminator resistor of 120Ω
must be present at each end of the bus to avoid signal reflections. The bus might need a failsafe biasing mechanism (see section 4.8 for more details).
2.3 Connection to the power supply
The INMBSMID---I000 interface must be powered from an external power supply.
Use an external 12V DC power supply connected to V1/V2 connector. The V1/V2 connection
has specific polarity (V1- y V2+).
Intesis® INMBSMID---I000
User’s Manual r1.4 EN
© HMS Industrial Networks S.L.U - All rights reserved
This information is subject to change without notice
URL https://www.intesis.com
7 / 24
2.4 Connection diagrams
Figure 2.1 INMBSMID001I000 connection diagram
Figure 2.2 INMBSMID004I000 / INMBSMID008I000 /INMBSMID032I000 connection
diagram
NOTE: If a CCM Central Controller is present in the XYE bus, the INMBSMID---I000 cannot
be connected. Please, disconnect the CCM Central Controller for use of the gateway.
90 mm / 3.5”
MODBUS RTU
EIA-485
Bus
EIA485
A+ B-
X Y V1 V2
AC Unit Power
53 mm / 2.1”
For wall mounting,
extract the upper
and down staples
until you hear the
"click".
AC Indoor Unit
Max. 100 m / 328.08 ft
Connection to XYE bus.
Two wire cable.
X
Y
E
Internal
electronic
control board
External power supply 12V DC
(-) (+)
90 mm / 3.5”
MODBUS RTU
EIA-485
Bus
EIA485
A+ B-
X Y V1 V2
AC Unit Power
53 mm / 2.1”
AC Indoor Unit
Bus length
Max. 100 m / 328.08 ft
Connection to XYE bus.
Two wire cable.
External power supply 12V DC
(-) (+)
X
Y
E
X
Y
E
X
Y
E
AC Indoor Unit
AC Indoor Unit
Intesis® INMBSMID---I000
User’s Manual r1.4 EN
© HMS Industrial Networks S.L.U - All rights reserved
This information is subject to change without notice
URL https://www.intesis.com
8 / 24
3 Quick Start Guide
1. Disconnect the air conditioning from the Mains Power.
2. Attach the interface close to the AC indoor unit (wall mounting) following the
instructions of the diagram above. Install it inside the AC indoor unit or an electrical
enclosure (respect the safety instructions provided by the AC manufacturer).
3. Connect the XYE bus between the interface and the AC indoor unit following the
instructions of the installation diagram respecting the polarity.
4. Connect the Modbus RTU (EIA-485) bus to the EIA485 A/B connector of the interface.
5. Connect the power cable between the interface and the Mains Power following the
instructions of the diagram. Screw each bare cable end in the corresponding V1/V2
terminals.
6. Check the DIP-Switch configuration of the Intesis interface and make sure it matches
the current installation’s parameters:
By default, the interface is set to:
▪ Modbus Slave Address ➔ 1
▪ Modbus baud rate ➔ 9600 bps
These parameters can be modified from SW3 and SW4 DIP-Switches.
All other switch positions are set at low level (Off position ) by default.
NOTE: All changes on the DIP-Switch configuration require a system power cycle to
be applied.
7. Connect the AC system to Mains Power.
IMPORTANT: The Intesis interface requires to be connected to the AC unit (powered)
to start the communication.
ON
ON
SW3
SW4
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