Modbus communication modules for LG air conditioners

Modbus communication modules for LG air conditioners

This category includes LG Modbus communication modules, designed to connect LG VRF series indoor units and models with built-in infrared receivers to building automation and supervisory systems via the Modbus RTU (RS-485) protocol. These modules act as gateways between HVAC equipment and BMS or SCADA platforms, enabling precise control, remote diagnostics, and energy optimization. The integration of LG air conditioners into industrial and commercial automation systems leads to better operational efficiency, reduced energy costs, and improved equipment longevity.

The list of compatible LG indoor units can be found in the official documentation: COMPATIBILITY LIST.

Features and functions of LG Modbus communication modules

Each Modbus module allows the connection of one LG indoor unit to the Modbus network. For installations requiring control of multiple units, the modules can be connected serially over an RS-485 Modbus RTU bus. Up to 63 modules can be integrated into a single network segment, offering centralized HVAC management in buildings such as hotels, office blocks, retail stores, and industrial facilities.

The modules are internally powered and provide 1500 VDC isolation for safe operation in demanding environments. Configuration can be performed using DIP switches or remotely via the Modbus RTU protocol. This flexibility enables fast deployment, whether you're installing a single unit or configuring a complex distributed system. Modules support simultaneous use of the infrared remote control, allowing users to operate the AC unit locally while maintaining full BMS access to its status and functions.

Mounting is also simplified – each module can be installed on a DIN rail (TH35) or mounted directly on a wall. This makes them suitable for electrical cabinets, equipment rooms, and retrofit installations. Once installed, the module communicates with the air conditioner via LG's proprietary interface and with the Modbus network using standard holding/input registers. System integrators can easily read or write parameters such as operating mode, fan speed, temperature setpoint, current temperature, fault codes, and power status.

With Modbus being one of the most widely used protocols in industrial automation, these LG gateway modules fit seamlessly into control systems involving PLCs, HMIs, energy meters, lighting systems, and more. They enable engineers to synchronize HVAC behavior with other systems based on occupancy, load demand, or time schedules. The result is improved indoor comfort and energy savings, with enhanced visibility and control at all levels of building operation.

For facility managers and building automation professionals, LG Modbus modules offer a reliable, low-maintenance way to integrate air conditioning units into existing infrastructure without needing proprietary control platforms. Their robustness, ease of configuration, and proven interoperability make them ideal for both new installations and retrofit projects seeking to modernize HVAC control.

If you are unsure whether your LG air conditioning system is compatible with our Modbus module or if you need help choosing the right gateway, our specialist will be happy to assist you. We can help validate your setup and provide technical recommendations to ensure successful integration – contact an expert.

Select the LG Modbus communication module that best fits your system requirements and access the detailed technical specifications. Take control of your HVAC infrastructure with reliable, standards-based Modbus integration.