ONOKOM AIR ME-1-MB-B

Use cases

• Monitor indoor air temperature and AC status remotely on a live ModbusCloud dashboard.
• Control target temperature and operation mode for Mitsubishi Electric AC units from any location.
• Create an alert when the indoor temperature deviates more than 2 degrees from the setpoint.
• Adjust fan speed and vane positions remotely to optimize comfort without a site visit.
• Track quiet mode status across multiple AC units in a multi-zone commercial building.
• Log historical temperature and operating mode data for energy analysis and reporting.

Installation

1. 1Connect the ONOKOM ME-1-MB-B gateway to the Mitsubishi Electric indoor unit using the AC unit's communication port as described in the ONOKOM installation manual.
2. 2Wire the Modbus RTU lines (A, B, and GND) from the ONOKOM ME-1-MB-B to the RS-485 port on your ModbusCloud gateway (MCG or MLP series).
3. 3Set the baud rate on the ModbusCloud gateway to 9600 to match the ONOKOM ME-1-MB-B default settings.
4. 4If multiple ONOKOM gateways share the same bus, assign each a unique Modbus address using service register 128.
5. 5Import the ONOKOM AIR ME-1-MB-B template from the ModbusCloud template library and assign it to the correct Modbus address.
6. 6Verify communication by checking that indoor air temperature and AC connection status appear on the ModbusCloud dashboard.

Things to watch for

01

How do I change the Modbus address of the ONOKOM ME-1-MB-B?

Write the desired address to service register 128 on the gateway. This is necessary when multiple ONOKOM gateways are connected on the same Modbus RTU bus to avoid address conflicts.

02

What baud rate should I use?

The default baud rate is 9600. Make sure your ModbusCloud gateway RS-485 port is also configured to 9600 baud, 8 data bits, no parity, and 1 stop bit (8N1) unless the ONOKOM documentation specifies otherwise.

03

Can I control vane positions and quiet mode, or are they read-only?

The quiet mode, vertical vane, and horizontal vane registers are both readable and writable. You can monitor their current state and change them remotely through the template.

04

Do I need one ONOKOM gateway per air conditioner?

Yes. Each ONOKOM ME-1-MB-B gateway connects to a single Mitsubishi Electric indoor unit. For multi-unit installations, use one gateway per AC unit and assign unique Modbus addresses.

Registers (11)

5 read / 9 write

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