LG PMBUSB00A Modbus Gateway

Use cases

• Monitor room temperature and pipe temperatures of LG indoor units on a live cloud dashboard.
• Create an alert when a filter alarm triggers so maintenance can be scheduled proactively.
• Remotely switch operate mode between cooling, heating, and fan-only for LG air conditioners.
• Track pipe-in and pipe-out temperatures of an LG HydroKit or AWHP heat pump to verify system efficiency.
• Adjust room temperature setpoints for multiple LG indoor units from one central interface without a site visit.
• Log historical temperature data for comfort audits or energy performance reports.

Installation

1. 1Connect the ModbusCloud gateway (MCG or MLP series) to the LG PMBUSB00A via RS-485 wiring, observing correct A/B polarity and ground connections.
2. 2Set the Modbus RTU baud rate on the ModbusCloud gateway to 9600 to match the PMBUSB00A default.
3. 3Ensure an LG technician has assigned unique addresses to all indoor units on the LG HVAC bus before proceeding.
4. 4Import the LG PMBUSB00A template in the ModbusCloud platform, which contains predefined registers for indoor unit address 0.
5. 5For indoor units with address greater than 0, recalculate the Modbus register addresses using the provided Excel table and update the template accordingly.
6. 6Verify communication by checking live values for room temperature and connected IDU status on the ModbusCloud dashboard.

Things to watch for

Registers (6)

5 read / 4 write

More LG templates

LG PDRYCB500

LG

Modbus RTU

Controls LG HVAC units via a Modbus RTU contact board.

6 registers71

More RTU templates

Alnor HRU

Alnor Systemy Wentylacji Sp. z o. o.

Modbus RTUCertified

Controls and monitors Alnor heat recovery ventilation units via Modbus RTU.

29 registers13

Heidelberg Wallbox Energy Control

AMPERFIED GmbH

Modbus RTUCertified

Controls and monitors Heidelberg Wallbox Energy Control EV charger via Modbus RTU.

22 registers67

connecdoor.controller

connecdoor

Modbus RTUCertified

Controls and monitors smart door access points via RS485

0 registers53

Wattsonic - Schmachtl Sun Energy Box

Wattsonic

Modbus RTUCertified

Monitors Schmachtl Wattsonic hybrid inverter via Modbus RTU

92 registers72

Alnor HRU-P

Alnor Systemy Wentylacji Sp. z o. o.

Modbus RTUCertified

Controls Alnor HRU-P heat recovery ventilation units via Modbus RTU.

49 registers7

E+E Elektronik EE600 - Differential Pressure Sensor

E+E Elektronik

Modbus RTU

Measures differential air pressure for HVAC and filter monitoring applications.

1 registers21