ONOKOM AIR CG-VRF-MB-B
Controls Chigo air conditioners via the ONOKOM CG-VRF-MB-B gateway
This template connects Chigo air conditioners to the ModbusCloud platform via the ONOKOM CG-VRF-MB-B gateway over Modbus RTU. It enables remote monitoring and control of supported Chigo VRF and split air conditioning units through a cloud dashboard.
- Protocol
- Modbus RTU
- Connection
- RS485
- Registers
- 0, read only
- Brand
- Onokom
- Compatible models
- CG-VRF-MB-B
- Last updated
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If a device is not in the library yet, we build the template for free as soon as we have the register data.
Use cases
- Monitor room temperature and operating mode of each Chigo indoor unit on a live cloud dashboard.
- Control on/off state and target temperature of Chigo air conditioners remotely from the ModbusCloud platform.
- Create an alert when an indoor unit reports an error code or goes offline unexpectedly.
- Log historical temperature and runtime data for energy reporting and maintenance planning.
- Manage multiple Chigo VRF zones across different sites from a single ModbusCloud account.
Installation
Wire the ONOKOM CG-VRF-MB-B gateway to the Chigo air conditioning system following the ONOKOM installation manual.
Connect the RS-485 (A, B, GND) terminals of the ONOKOM gateway to the RS-485 port on your ModbusCloud Gateway.
Set the Modbus slave address, baud rate, and parity on the ONOKOM CG-VRF-MB-B to match the configuration in the ModbusCloud gateway.
Import the ONOKOM AIR CG-VRF-MB-B template into your ModbusCloud project and assign it to the correct Modbus gateway port.
Use the included example project (v1.0.1) to verify register mapping and confirm communication with the Chigo units.
Check the live data view in the ModbusCloud dashboard to confirm that temperature readings and control commands are working correctly.
Things to watch for
No public register map is available. How do I know which registers to use?
The template ships with an example project (v1.0.1) that contains a working register configuration. Use this as your starting point and adjust if your Chigo unit model or ONOKOM firmware version differs.
What baud rate and parity settings should I use for the RS-485 connection?
The default settings for most ONOKOM gateways are 9600 baud, 8 data bits, 1 stop bit, and no parity (9600 8N1). Confirm this in the ONOKOM device documentation before commissioning.
Can I control multiple indoor units with a single ONOKOM CG-VRF-MB-B gateway?
Yes. The CG-VRF-MB-B can address multiple Chigo indoor units on the same VRF bus. Each unit is typically mapped to a different set of Modbus registers or a different slave address depending on the ONOKOM configuration.
The template shows Modbus TCP but the gateway uses Modbus RTU. Is there a conflict?
The ModbusCloud platform handles protocol conversion internally. Your ModbusCloud Gateway communicates with the ONOKOM device over RS-485 using Modbus RTU, while the cloud connection uses TCP. No additional converter is needed.
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