Fujitsu Airstage UTY-VMGX

Name: Fujitsu Airstage UTY-VMGX
Brand: Fujitsu
SKU: 9b92c04b-b875-467a-8c94-39ad60dacf84

Controls up to 45 Fujitsu air conditioner units via Modbus converter.

Modbus RTU template for the Fujitsu Airstage UTY-VMGX converter. Reads on/off status and operation mode for up to 45 indoor units, and writes power, operation mode, set temperature, and airflow settings.

Protocol: Modbus RTU
Connection: RS485, 9600 baud
Registers: 227, read and write

Brand: Fujitsu
Key readings: Unit Status ON/OFF (units 1-45) · Unit Operation Mode (units 1-45)
Available commands: Power ON/OFF · Operation Mode · Set Temperature · Airflow
Compatible models: UTY-VMGX
Last updated: 2 April 2026

Registers (227)

47 read, 180 write

Name	Unit	Access
Unit 01 Status ON OFF		Read
Unit 01 Operation mode		Read
Unit 16 Status ON OFF		Read
Unit 16 Operation mode		Read
Unit 02 Status ON OFF		Read
Unit 03 Status ON OFF		Read
Unit 04 Status ON OFF		Read
Unit 05 Status ON OFF		Read
Unit 06 Status ON OFF		Read
Unit 07 Status ON OFF		Read
Unit 08 Status ON OFF		Read
Unit 09 Status ON OFF		Read
Unit 10 Status ON OFF		Read
Unit 11 Status ON OFF		Read
Unit 12 Status ON OFF		Read
Unit 13 Status ON OFF		Read
Unit 14 Status ON OFF		Read
Unit 15 Status ON OFF		Read
Unit 44 Status ON OFF		Read
Unit 45 Status ON OFF		Read
Unit 17 Status ON OFF		Read
Unit 18 Status ON OFF		Read
Unit 19 Status ON OFF		Read
Unit 20 Status ON OFF		Read
Unit 21 Status ON OFF		Read
Unit 22 Status ON OFF		Read
Unit 23 Status ON OFF		Read
Unit 24 Status ON OFF		Read
Unit 25 Status ON OFF		Read
Unit 26 Status ON OFF		Read
Unit 27 Status ON OFF		Read
Unit 28 Status ON OFF		Read
Unit 29 Status ON OFF		Read
Unit 30 Status ON OFF		Read
Unit 31 Status ON OFF		Read
Unit 32 Status ON OFF		Read
Unit 33 Status ON OFF		Read
Unit 34 Status ON OFF		Read
Unit 35 Status ON OFF		Read
Unit 36 Status ON OFF		Read
Unit 37 Status ON OFF		Read
Unit 38 Status ON OFF		Read
Unit 39 Status ON OFF		Read
Unit 40 Status ON OFF		Read
Unit 41 Status ON OFF		Read
Unit 42 Status ON OFF		Read
Unit 43 Status ON OFF		Read
Unit 01 Airflow		Write
Unit 01 Power ON_OFF		Write
Unit 01 Operation Mode		Write
Unit 01 Set Temperature	°C	Write
Unit 16 Airflow		Write
Unit 16 Operation Mode		Write
Unit 16 Power ON_OFF		Write
Unit 16 Set Temperature	°C	Write
Unit 02 Power ON_OFF		Write
Unit 03 Power ON_OFF		Write
Unit 04 Power ON_OFF		Write
Unit 05 Power ON_OFF		Write
Unit 06 Power ON_OFF		Write
Unit 07 Power ON_OFF		Write
Unit 08 Power ON_OFF		Write
Unit 09 Power ON_OFF		Write
Unit 10 Power ON_OFF		Write
Unit 11 Power ON_OFF		Write
Unit 12 Power ON_OFF		Write
Unit 13 Power ON_OFF		Write
Unit 14 Power ON_OFF		Write
Unit 15 Power ON_OFF		Write
Unit 44 Power ON_OFF		Write
Unit 45 Power ON_OFF		Write
Unit 17 Power ON_OFF		Write
Unit 18 Power ON_OFF		Write
Unit 19 Power ON_OFF		Write
Unit 20 Power ON_OFF		Write
Unit 21 Power ON_OFF		Write
Unit 22 Power ON_OFF		Write
Unit 23 Power ON_OFF		Write
Unit 24 Power ON_OFF		Write
Unit 25 Power ON_OFF		Write
Unit 26 Power ON_OFF		Write
Unit 27 Power ON_OFF		Write
Unit 28 Power ON_OFF		Write
Unit 29 Power ON_OFF		Write
Unit 30 Power ON_OFF		Write
Unit 31 Power ON_OFF		Write
Unit 32 Power ON_OFF		Write
Unit 33 Power ON_OFF		Write
Unit 34 Power ON_OFF		Write
Unit 35 Power ON_OFF		Write
Unit 36 Power ON_OFF		Write
Unit 37 Power ON_OFF		Write
Unit 38 Power ON_OFF		Write
Unit 39 Power ON_OFF		Write
Unit 40 Power ON_OFF		Write
Unit 41 Power ON_OFF		Write
Unit 42 Power ON_OFF		Write
Unit 43 Power ON_OFF		Write
Unit 02 Operation Mode		Write
Unit 03 Operation Mode		Write
Unit 04 Operation Mode		Write
Unit 05 Operation Mode		Write
Unit 06 Operation Mode		Write
Unit 07 Operation Mode		Write
Unit 08 Operation Mode		Write
Unit 09 Operation Mode		Write
Unit 10 Operation Mode		Write
Unit 11 Operation Mode		Write
Unit 12 Operation Mode		Write
Unit 13 Operation Mode		Write
Unit 14 Operation Mode		Write
Unit 15 Operation Mode		Write
Unit 45 Operation Mode		Write
Unit 17 Operation Mode		Write
Unit 18 Operation Mode		Write
Unit 19 Operation Mode		Write
Unit 20 Operation Mode		Write
Unit 21 Operation Mode		Write
Unit 22 Operation Mode		Write
Unit 23 Operation Mode		Write
Unit 24 Operation Mode		Write
Unit 25 Operation Mode		Write
Unit 26 Operation Mode		Write
Unit 27 Operation Mode		Write
Unit 28 Operation Mode		Write
Unit 29 Operation Mode		Write
Unit 30 Operation Mode		Write
Unit 31 Operation Mode		Write
Unit 32 Operation Mode		Write
Unit 33 Operation Mode		Write
Unit 34 Operation Mode		Write
Unit 35 Operation Mode		Write
Unit 36 Operation Mode		Write
Unit 37 Operation Mode		Write
Unit 38 Operation Mode		Write
Unit 39 Operation Mode		Write
Unit 40 Operation Mode		Write
Unit 41 Operation Mode		Write
Unit 42 Operation Mode		Write
Unit 43 Operation Mode		Write
Unit 44 Operation Mode		Write
Unit 02 Airflow		Write
Unit 03 Airflow		Write
Unit 04 Airflow		Write
Unit 05 Airflow		Write
Unit 06 Airflow		Write
Unit 07 Airflow		Write
Unit 08 Airflow		Write
Unit 09 Airflow		Write
Unit 10 Airflow		Write
Unit 11 Airflow		Write
Unit 12 Airflow		Write
Unit 13 Airflow		Write
Unit 14 Airflow		Write
Unit 15 Airflow		Write
Unit 45 Airflow		Write
Unit 17 Airflow		Write
Unit 18 Airflow		Write
Unit 19 Airflow		Write
Unit 20 Airflow		Write
Unit 21 Airflow		Write
Unit 22 Airflow		Write
Unit 23 Airflow		Write
Unit 24 Airflow		Write
Unit 25 Airflow		Write
Unit 26 Airflow		Write
Unit 27 Airflow		Write
Unit 28 Airflow		Write
Unit 29 Airflow		Write
Unit 30 Airflow		Write
Unit 31 Airflow		Write
Unit 32 Airflow		Write
Unit 33 Airflow		Write
Unit 34 Airflow		Write
Unit 35 Airflow		Write
Unit 36 Airflow		Write
Unit 37 Airflow		Write
Unit 38 Airflow		Write
Unit 39 Airflow		Write
Unit 40 Airflow		Write
Unit 41 Airflow		Write
Unit 42 Airflow		Write
Unit 43 Airflow		Write
Unit 44 Airflow		Write
Unit 02 Set Temperature	°C	Write
Unit 03 Set Temperature	°C	Write
Unit 04 Set Temperature	°C	Write
Unit 05 Set Temperature	°C	Write
Unit 06 Set Temperature	°C	Write
Unit 07 Set Temperature	°C	Write
Unit 08 Set Temperature	°C	Write
Unit 09 Set Temperature	°C	Write
Unit 10 Set Temperature	°C	Write
Unit 11 Set Temperature	°C	Write
Unit 12 Set Temperature	°C	Write
Unit 13 Set Temperature	°C	Write
Unit 14 Set Temperature	°C	Write
Unit 15 Set Temperature	°C	Write
Unit 45 Set Temperature	°C	Write
Unit 17 Set Temperature	°C	Write
Unit 18 Set Temperature	°C	Write
Unit 19 Set Temperature	°C	Write
Unit 20 Set Temperature	°C	Write
Unit 21 Set Temperature	°C	Write
Unit 22 Set Temperature	°C	Write
Unit 23 Set Temperature	°C	Write
Unit 24 Set Temperature	°C	Write
Unit 25 Set Temperature	°C	Write
Unit 26 Set Temperature	°C	Write
Unit 27 Set Temperature	°C	Write
Unit 28 Set Temperature	°C	Write
Unit 29 Set Temperature	°C	Write
Unit 30 Set Temperature	°C	Write
Unit 31 Set Temperature	°C	Write
Unit 32 Set Temperature	°C	Write
Unit 33 Set Temperature	°C	Write
Unit 34 Set Temperature	°C	Write
Unit 35 Set Temperature	°C	Write
Unit 36 Set Temperature	°C	Write
Unit 37 Set Temperature	°C	Write
Unit 38 Set Temperature	°C	Write
Unit 39 Set Temperature	°C	Write
Unit 40 Set Temperature	°C	Write
Unit 41 Set Temperature	°C	Write
Unit 42 Set Temperature	°C	Write
Unit 43 Set Temperature	°C	Write
Unit 44 Set Temperature	°C	Write

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Use cases

Monitor on/off status and operation mode of all connected Fujitsu indoor units on a single dashboard.
Adjust setpoint temperatures remotely for individual air conditioning units without on-site visits.
Create alerts when a unit switches off unexpectedly or changes to an unintended operation mode.
Log airflow and temperature setpoint changes over time to verify compliance with energy management policies.
Control power state for groups of indoor units based on occupancy schedules or time-of-day rules.

Installation

Connect the Fujitsu UTY-VMGX converter to the Fujitsu indoor units via the proprietary communication bus, following the wiring instructions in the UTY-VMGX manual.
Wire the RS-485 Modbus RTU connection from the UTY-VMGX to the ModbusCloud Gateway, observing correct A, B, and GND terminal assignments.
Set the Modbus slave address on the UTY-VMGX converter to match the address configured in the ModbusCloud template.
Configure the serial port on the ModbusCloud gateway to 9600 baud, odd parity, and 1 stop bit to match the UTY-VMGX defaults.
Import the Fujitsu Airstage UTY-VMGX template in the ModbusCloud platform and assign it to the correct gateway and slave address.
Verify that read registers return valid on/off status and operation mode data for each connected indoor unit before deploying write commands.

Things to watch for

Why am I not getting any data from the UTY-VMGX converter?

Check that the RS-485 wiring is correct, with A, B, and GND properly connected. Confirm that the gateway serial port is set to 9600 baud with odd parity. Also verify that the Modbus slave address on the converter matches the address configured in ModbusCloud.

How do I address a specific indoor unit in the register map?

Each indoor unit uses a block of 60 registers. Write registers for unit 1 start at address 1, and read registers for unit 1 start at address 53. For unit N, offset both starting addresses by (N minus 1) times 60.

Can I control fewer than 45 units with this template?

Yes. The template supports up to 45 units, but you only need to poll the registers corresponding to the units that are physically connected. Unused unit registers can be disabled in the ModbusCloud configuration to reduce unnecessary polling.

What parity setting does the UTY-VMGX require?

The UTY-VMGX uses odd parity at 9600 baud. If parity is set incorrectly on your Modbus gateway, communication will fail or return CRC errors.

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Fujitsu general Limited UTY-VMSXFujitsu · Modbus RTU · 12 registers

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