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INMBSLGE001R000
User guide
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Intesis INMBSLGE001R000 User guide

USER MANUAL
Issue date: 05/2020 r1.7 ENGLISH
User’s Manual r1.7 EN
© HMS Industrial Networks S.L.U. - All rights reserved
This information is subject to change without notice
URL https://www.intesis.com
2 / 22
Modbus RTU (EIA-485) Interface for LG air conditioners
ORDER CODE
LEGACY ORDER CODE
INMBSLGE001R000
LG-RC-MBS-1
User’s Manual r1.7 EN
© HMS Industrial Networks S.L.U. - All rights reserved
This information is subject to change without notice
URL https://www.intesis.com
3 / 22
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.
User’s Manual r1.7 EN
© HMS Industrial Networks S.L.U. - All rights reserved
This information is subject to change without notice
URL https://www.intesis.com
4 / 22
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 ...................................................................... 14
4.4 Implemented Functions ..................................................................................... 17
4.5 Device LED indicator ......................................................................................... 17
4.6 EIA-485 bus. Termination resistors and Fail-Safe Biasing mechanism ...................... 18
5. Mechanical and electrical features .......................................................................... 19
6. List of supported AC Unit Types. ............................................................................ 20
7. Error Codes ......................................................................................................... 21
User’s Manual r1.7 EN
© HMS Industrial Networks S.L.U. - All rights reserved
This information is subject to change without notice
URL https://www.intesis.com
5 / 22
1. Presentation
The INMBSLGE001R000 interfaces allow a complete and natural integration of
LG air conditioners into Modbus RTU (EIA-485) networks.
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 INMBSLGE001R000 devices
can be connected in the same network.
INMBSLGE001R000 is a Modbus slave device.
• Direct connection to the AC indoor unit.
• 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
INMBSLGE001R000
INMBSLGE001R000 INMBSLGE001R000
User’s Manual r1.7 EN
© HMS Industrial Networks S.L.U. - All rights reserved
This information is subject to change without notice
URL https://www.intesis.com
6 / 22
2. Connection
The interface comes with a plug-in terminal block of 3 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.
2.1 Connect to the AC indoor unit
The INMBSLGE001R000 connects directly to the LG BYR 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 BYR bus of the
indoor unit as Master when there is no LG Remote Controller.
Maximum BYR bus length is 50 m / 164.04 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.
MODBUS RTU
EIA-485
Bus
EIA485
A+ B-
53 mm / 2.1”
Max. 50 m / 164.04 ft
AC Indoor Unit
90 mm / 3.5”
MODBUS RTU
EIA-485
Bus
EIA485
A+ B-
B Y R
AC Unit
53 mm / 2.1”
For wall mounting extract the upper and down staples until you hear the "click".
R Y B
Max. 50 m / 164.04 ft
Remote Controller
GND (3) B
Data (2) Y
Power (1) R
90 mm / 3.5”
AC Indoor Unit
Internal electronic control board
Internal electronic control board
B Y R
AC Unit
GND (3) B
Data (2) Y
Power (1) R
Attention: Type A units don’t allow to install a Remote Controller and
INMBSLGE001R000 together.
Figure 2. 1 INMBSLGE001R000 connection diagram
User’s Manual r1.7 EN
© HMS Industrial Networks S.L.U. - All rights reserved
This information is subject to change without notice
URL https://www.intesis.com
7 / 22
2.2 Connection to the EIA-485 bus
Connect the EIA-485 bus wires to the plug-in terminal block (the one of two poles) of INMBSLGE001R000 and keep the polarity on this connection (A+ and B-). Make sure that the maximum distance to the bus is 1,200 meters (3,937 ft). Loop or star typologies are not allowed in the case of the EIA-485 bus. A terminator resistor of 120Ω must be present at each end of the bus to avoid signal reflections. The bus needs a fail-safe biasing mechanism (see section 4.6 for more details).
3. Quick Start Guide
1. Disconnect the air conditioning from the Mains Power.
2. Attach the interface next to the AC indoor unit (wall mounting) following the instructions
of the diagram below or install it inside the AC indoor unit (respect the safety instructions given).
3. Connect the BYR bus between the interface and the AC indoor unit following the
instructions of the diagram. Screw each bare cable end in the corresponding BYR terminals of each device.
4. Connect the EIA-485 bus to the connector EIA485 of the interface.
5. Close the AC indoor unit.
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 SW4 and SW3 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 communicating.
ON
ON
SW3
SW4
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