The gateway does not respond on the RS-485 bus. What should I check?

Verify that the A and B wires are not swapped between the ONOKOM gateway and the ModbusCloud gateway. Confirm the baud rate is set to 9600 on both sides and that the correct Modbus slave address is configured.

Can I connect multiple ONOKOM HS-6-MB-B gateways on the same RS-485 bus?

Yes. Each gateway must have a unique Modbus address. You can change the address by writing to register 128 on each unit. Make sure to assign distinct addresses before connecting them to the same bus.

The sleep mode and fan speed values seem to conflict. Why?

Register address 8 is shared for sleep mode and smart fan speed, serving as both a read and write register. Be careful when writing to this register, as it controls both functions. Check the ONOKOM documentation for the exact value mapping.

What happens if the air conditioner is powered off at the breaker?

The AC connected status register will indicate that the unit is not reachable. Temperature readings may show stale or zero values. The ModbusCloud dashboard will reflect the loss of communication.

Free Modbus template: ONOKOM AIR HS-6-MB-B

Name: ONOKOM AIR HS-6-MB-B
Brand: Onokom
SKU: 5bf2a317-0ab4-4a9e-a38b-db75653252d3

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Free Modbus template: ONOKOM AIR HS-6-MB-B | ModbusCloud

Registers (11)

5 read / 7 write

Name	Address	Function	Type	Unit	Access
Indoor air temperature	3	FC03	uint16	°C	R
AC connected	20	FC03	uint16		R
Sleep mode (Status)	8	FC01	uint16		R/W
Current fan speed	32	FC03	uint16		R
Indoor heat exchanger temperature (Status)	23	FC03	uint16		R
Active (Control)	1	FC05	uint16		W
Loxone modes (Control)	15	FC06	uint16		W
Smart fan speed	8	FC06	uint16		W
Target temperature	5	FC06	int16	°C	W
Horizontal vanes	9	FC06	uint16		W
Modbus address (Service)	128	FC06	uint16		W

ONOKOM AIR HS-6-MB-B

Overview

Key readings

Available commands

Use cases

Installation

Things to watch for

Registers (11)

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