Controls VRF/VRV HVAC units via CoolMasterNet gateway over Modbus TCP.
Overview
Template for controlling VRF/VRV HVAC indoor units via the CoolAutomation CoolMasterNet or CoolLinkHub gateway over Modbus TCP. Supports on/off switching, operation mode, fan speed, and temperature setpoint for up to three indoor units (VA1, VA2, VA3).
Available commands
On/Off (VA1 to VA3)
Operation Mode (VA1 to VA3)
Fan Speed (VA1 to VA3)
Set Temp (VA1, VA3)
Use cases
Control on/off state of up to three VRF indoor units remotely from the ModbusCloud dashboard.
Switch operation modes between cooling, heating, and fan only for each indoor unit on a scheduled basis.
Adjust temperature setpoints for VA1 and VA3 units to maintain comfort levels across different zones.
Monitor last-sent fan speed and mode commands per unit to verify automation rules are executing correctly.
Create automation rules that turn off all HVAC units outside of business hours to reduce energy consumption.
Installation
1Connect the CoolMasterNet or CoolLinkHub to the same local network as the ModbusCloud gateway (MCG or MLP series) using an Ethernet cable.
2Ensure the CoolMasterNet or CoolLinkHub has Modbus TCP enabled and note its IP address and TCP port (default is 502).
3If using a CoolLinkHub, verify that a CoolPlug module is installed on each indoor unit you want to control.
4Import the CoolAutomation CoolMasterNet template from the ModbusCloud template library into your project.
5Set the target IP address, TCP port, and Modbus unit ID in the ModbusCloud gateway configuration to match the CoolMasterNet or CoolLinkHub settings.
6Send a test on/off command to VA1 and confirm the indoor unit responds before configuring the remaining units.
Things to watch for
Registers (11)
0 read / 11 write
Name
Address
Function
Type
Unit
Access
VA1 On Off
VA1
19
FC06
uint16
W
VA2 On Off
VA2
35
FC06
uint16
W
VA3 On Off
VA3
51
FC06
uint16
W
VA1 Operation Mode
VA1
16
FC06
uint16
W
VA2 Operation Mode
VA2
33
FC06
uint16
W
VA1 Set Temp
VA1
18
FC06
uint16
W
VA1 Fan Speed
VA1
17
FC06
uint16
W
VA2 Fan Speed
VA2
34
FC06
uint16
W
VA3 Operation Mode
VA3
48
FC06
uint16
W
VA3 Fan Speed
VA3
49
FC06
uint16
W
VA3 Set Temp
VA3
50
FC06
uint16
W
Use directly in ModbusCloud
Import this template into your own portal with one click, or get in touch for installation support.
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