Intesis INMBSHIT001R000 User guide
Compatible with commercial line for air conditioners commercialized by Hitachi
USER MANUAL
Issue date: 04/2019 r1.5 ENGLISH
Intesis
TM
INMBSHIT001R000
User’s Manual r1.5 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
TM
INMBSHIT001R000
User’s Manual r1.5 EN
© HMS Industrial Networks S.L.U - All rights reserved
This information is subject to change without notice
URL https://www.intesis.com
3 / 20
Modbus RTU (EIA-485) Interface for Hitachi air
conditioners
Compatible with commercial line for air conditioners
commercialized by Hitachi
ORDER CODE
LEGACY ORDER CODE
INMBSHIT001R000
HI-RC-MBS-1
Intesis
TM
INMBSHIT001R000
User’s Manual r1.5 EN
© HMS Industrial Networks S.L.U - All rights reserved
This information is subject to change without notice
URL https://www.intesis.com
4 / 20
INDEX
1. Presentation .......................................................................................................... 5
2. Connection ............................................................................................................ 6
2.1 Connect to the AC indoor unit ............................................................................... 6
2.2 Connection to the EIA-485 bus ............................................................................. 7
3. Quick Start Guide ................................................................................................... 7
4. Modbus Interface Specification ................................................................................ 8
4.1 Modbus physical layer.......................................................................................... 8
4.2 Modbus Registers ................................................................................................ 8
4.2.1 Control and status registers ........................................................................... 8
4.2.2 Configuration Registers................................................................................ 10
4.2.3 Considerations on Temperature Registers ...................................................... 11
4.3 DIP-switch Configuration Interface ...................................................................... 12
4.4 Implemented Functions ..................................................................................... 16
4.5 Device LED indicator ......................................................................................... 16
4.6 EIA-485 bus. Termination resistors and Fail-Safe Biasing mechanism ...................... 17
5. Mechanical and Electrical features .......................................................................... 18
6. List of supported AC Unit Types ............................................................................. 19
7. Error Codes ......................................................................................................... 20
Intesis
TM
INMBSHIT001R000
User’s Manual r1.5 EN
© HMS Industrial Networks S.L.U - All rights reserved
This information is subject to change without notice
URL https://www.intesis.com
5 / 20
1. Presentation
The INMBSHIT001R000 interfaces allow a complete and natural
integration of Hitachi air conditioners into Modbus RTU (EIA-485)
networks.
Compatible with commercial line for air conditioner models
commercialized by Hitachi.
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 of AC.
• External power not required.
• Direct connection to Modbus RTU (EIA-485) networks. Up to 63 INMBSHIT001R000 devices
can be connected in the same network.
INMBSHIT001R000 is a Modbus slave device.
• Direct connection to the AC indoor unit. Up to 16 AC indoor units can be connected to
INMBSHIT001R000, controlling them as one (not individually).
• 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.
* Up to 63 Intesis devices can be installed in the same Modbus RTU bus. However, depending on the configured speed, the installation
of Modbus Repeaters may be required
• SCADA
• PLC
• DDC
• BMS
• HMI
• Controller
• etc
Up to 63
AC indoor
units*
Modbus RTU
EIA-485 network
Modbus RTU
Master
device
INMBSHIT001R000
INMBSHIT001R000
INMBSHIT001R000
Intesis
TM
INMBSHIT001R000
User’s Manual r1.5 EN
© HMS Industrial Networks S.L.U - All rights reserved
This information is subject to change without notice
URL https://www.intesis.com
6 / 20
1. Connection
The interface comes with a plug-in terminal block of 2 poles to establish direct connection with
the AC indoor unit. It comes as well with a plug-in terminal block of 2 poles to establish direct
connection with the Modbus RTU EIA-485 network.
1.1 Connect to the AC indoor unit
The INMBSHIT001R000 connects directly to the Hitachi AB Bus, which is not provided within the
interface. Depending on which controllers are available, the recommended connection’ methods
are the following ones (details in Figure 2. 1):
• Wired remote control available. Connect the gateway as Slave in parallel with the
wired remote controllers (Controller acts as Master).
• No remote control available Connect the gateway directly to the AB bus of the indoor
unit as Master when there is no Hitachi Remote Controller.
Important: If there are more than one AC unit connected to the same AB bus, it is
required to install a Hitachi wired Remote Controller (set as Master of the bus)
Maximum AB bus length is 500 m / 1,640.42 ft. The bus has no polarity sensitivity.
Important: If a wired remote controller of the AC manufacturer is connected in the same bus,
communication may shut down.
Max 500 m / 1,640.42 ft
Max 500 m / 1,640.42 ft
A
B
MODBUS RTU
EIA-485
Bus
EIA485
A+ B-
A B
AC Unit
A B
AC Indoor Unit
(It is not mandatory to have it in the network)
Internal
electronic
control board
Remote Controller
HITACHI
B
A
MODBUS RTU
EIA-485
Bus
EIA485
A+ B-
A B
AC Unit
AC Indoor Unit
Internal
electronic
control board
53 mm / 2.1”
90 mm / 3.5”
90 mm / 3.5”
53 mm / 2.1”
For wall mounting
extract the upper
and down staples
until you hear the
"click".
Figure 2. 1 INMBSHIT001R000 connection diagram
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