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Mitsubishi Electric Domestic, Mr.Slim and City Multi to Modbus RTU Interface

Mitsubishi Electric Domestic, Mr.Slim and City Multi to Modbus RTU Interface

Product code: INMBSMIT001I000
The Mitsubishi Electric-Modbus gateway allows fully bi-directional communication between Mitsubishi Electric Domestic, Mr.Slim and City Multi Air Conditioner units and Modbus RTU (RS-485) networks.

The previous part number for this item was ME-AC-MBS-1

Price (Excluding VAT)



  • Modbus RTU (EIA485) slave device.
  • Configuration from both onboard DIP-switches and Modbus RTU.
  • Quick and easy installation (plug and set the DP-SW).
  • External power not required.
  • Simultaneous control of the AC unit by the IR remote controller and by Modbus RTU.
  • Reduced dimensions 93 x 53 x 58 mm.
  • Mountable on DIN rail, wall, or even inside the indoor unit in some models of AC.
  • Window contact function allows energy savings. Costs related to HVAC systems in a building are one of the highest and this type of functions allow to reduce them.
  • Total control and monitoring of the AC unit from Modbus RTU, including AC unitÕs internal variables, running hours counter (for filter maintenance control) and error indication.


The gateway is wired directly to an indoor unit. This allows not only the control of the main AC functions such as operating mode, fan speed, temperature setpointÉbut the monitoring of errors, alarms and some internal variables.


The product can be installed and set up in a really short time. ItÕs only a matter of wiring the gateway to the AC unit and configure the DIP-SW accordingly. No configuration software and no power supply are required.

The consistent Modbus register mapping used for all AC brands, helps improving the integration time of each project.

Technical Details



  • Plastic, type PC (UL 94 V-0)
  • Net dimensions (dxwxh): 93 x 53 x 58 mm / 3.7Ó x 2.1Ó x 2.3Ó
  • Colour: Light Grey. RAL 7035

Weight85 g.

MountingWall. DIN rail EN60715 TH35.

Terminal Wiring (for low-voltage signals):

  • For terminal: solid wires or stranded wires (twisted or with ferrule)
  • 1 core: 0.5mm2... 2.5mm2
  • 2 cores: 0.5mm2... 1.5mm2
  • 3 cores: not permitted

Modbus RTU port: 1 x Serial EIA485 Plug-in screw terminal block (2 poles) A, B. Compatible with Modbus RTU EIA-485 networks

AC unit port: 1 x Specific connector. Specific cable included

Switch 1 (SW1): 1 x DIP-Switch for AC features

Switch 3 (SW3): 1 x DIP-Switch for Modbus RTU settings.

Switch 4 (SW4): 1 x DIP-Switch for extra functions

Operation Temperature: 0oC to +60oC

Stock Temperature: -20oC to +85oC

Operational Humidity: <95% RH, non-condensing

Stock Humidity: <95% RH, non-condensing

Isolation voltage: 1500 VDC

Isolation resistance: 1000 M½

Protection: IP20

LED indicators: 2 x Onboard LED - Operational status



Technology BMS
Mounting DIN Rail
IP rating IP20
Mounting Width 4MW

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