Mitsubishi CN105 Climate

Overview

The mitsubishi_cn105 component allows communication with Mitsubishi Electric indoor units using the CN105 connector.

The component communicates with the unit over UART and provides control and state reporting.

Hardware Connection

The CN105 connector exposes power and UART communication lines.

CN105 pinout

Pin	Function	Wire color	ESP8266
1	NC
2	GND	orange	GND
3	5V	brown	5V
4	TX	blue	RX
5	RX	red	TX

CN105 connector wired to a D1 Mini Pro

WARNING

Verify the pinout and voltage levels before connecting.

This component requires a UART bus configured with:

• 8 data bits
• EVEN parity
• 1 stop bit
• Baud rate 2400 or 9600

NOTE

The required baud rate depends on the indoor unit. During initial setup, try both supported values if communication does not work.

Example configuration

uart:
  id: ac_uart
  tx_pin: GPIO1
  rx_pin: GPIO3
  data_bits: 8
  baud_rate: 2400
  parity: EVEN
  stop_bits: 1

climate:
  - platform: mitsubishi_cn105
    name: "Living Room AC"
    uart_id: ac_uart
    update_interval: 1s

Supported features

• Target temperature range: 16 °C to 31 °C
• Current temperature reporting
• Modes: OFF, AUTO, HEAT, COOL, DRY, FAN_ONLY
• Fan modes: AUTO, QUIET, LOW, MEDIUM, MIDDLE, HIGH

NOTE

Fan modes map to the following Mitsubishi fan speeds:

• AUTO → AUTO
• QUIET → QUIET
• LOW → SPEED 1
• MEDIUM → SPEED 2
• MIDDLE → SPEED 3
• HIGH → SPEED 4

Configuration variables

• uart_id (Optional, ID): The UART bus to use.
• update_interval (Optional, Time): Interval between status updates. Defaults to 1s. Lower values provide faster detection of external changes, for example when using the remote control.
• All other options from Climate.

Acknowledgments

Thanks to the following projects and authors for their work on reverse engineering and documenting the protocol:

• SwiCago/HeatPump
• Chris Davis and his blog series
• Hadley from New Zealand and his write-up

See Also

• Climate Component