Why do I see incorrect values for outdoor temperature or quiet mode status?

Address 4 is shared between outdoor air temperature (read) and quiet mode status (read/write). Ensure the correct Modbus function code is used for each operation. The template handles this automatically, but custom polling configurations may cause conflicts.

What baud rate should I use for the ONOKOM HS-3-MB-B?

The default and recommended baud rate is 9600. Make sure both the ONOKOM gateway and the ModbusCloud gateway are set to the same baud rate, parity, and stop bit configuration.

Can I connect multiple Hisense AC units on the same RS-485 bus?

Yes, each ONOKOM HS-3-MB-B gateway must have a unique Modbus slave address. You can daisy-chain multiple gateways on the same RS-485 bus and create a separate template instance for each in ModbusCloud.

The ModbusCloud gateway does not receive any data from the ONOKOM device. What should I check?

Verify the RS-485 wiring polarity (A to A, B to B). Confirm that the slave address matches the address configured in the template. Check that the ONOKOM gateway is powered and properly connected to the Hisense indoor unit.

Free Modbus template: ONOKOM AIR HS-3-MB-B

Name: ONOKOM AIR HS-3-MB-B
Brand: Onokom
SKU: 9d0a4737-6c47-44d6-9371-c50e6f930fb7

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Free Modbus template: ONOKOM AIR HS-3-MB-B | ModbusCloud

Registers (20)

14 read / 12 write

Name	Address	Function	Type	Unit	Access
Indoor air temperature	3	FC03	uint16	°C	R
Outdoor air temperature	4	FC03	int16	°C	R
AC connected	20	FC01	uint16		R
Screen light (Status)	2	FC01	uint16		R/W
Sleep mode (Status)	8	FC01	uint16		R/W
Eco mode (Status)	6	FC01	uint16		R/W
Indoor heat exchanger temperature	23	FC04	uint16	°C	R
Outdoor heat exchanger temperature	24	FC03	uint16	°C	R
Vertical vanes (Status)	10	FC03	uint16		R/W
Horizontal vanes	9	FC03	uint16		R/W
Quiet mode (Status)	4	FC02	uint16		R/W
Indoor humidity	27	FC03	uint16	%	R
Current compressor power	21	FC03	uint16	%	R
Target compressor power	22	FC03	uint16	W	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
Modbus address	128	FC06	uint16		W
Vanes swing	11	FC06	uint16		W

ONOKOM AIR HS-3-MB-B

Overview

Key readings

Available commands

Use cases

Installation

Things to watch for

Registers (20)

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