For Ecodan ASHP Units I have included my reference implemenataion, but all very much work in progress

https://gitter.im/Mitsubishi-CN105-Protocol-Decode/community

Serial, 2400, 8, E, 1

0xfc

Payload Size (Bytes)

Checksum = 0xfc - Sum ( PacketBytes[0..20]) ;

Active commands so far identified.

• Flags : Flags to Indicate which fields are active
  • 0x80 : Set Zone Setpoints, Byte[2] determines which Zones
  • 0x40 : Unknown
  • 0x20 : Set Hotwater Setpoint
  • 0x10 : Unknown
  • 0x08 : Set Heating Control Mode
  • 0x04 : Set Hot Water Mode
  • 0x02 : Unknown
  • 0x01 : Set System Power Power
• Z : Zones the Command Applies to
  • 0x00 : Zone 1
  • 0x01 : Zone 2 ( Probably )
  • 0x02 : Both
• P : System Power
  • 0x00 : Standby
  • 0x01 : Power On
• DHW : Hot Water Mode
  • 0x00 : Normal
  • 0x01 : Eco
• HC1 : Heating Control Mode Zone 1
  • 0 : Temperature Mode
  • 1 : Flow Control Mode
  • 2 : Compensation Curve Mode
• HC2 : Heating Control Mode Zone 2
  • 0 : Temperature Mode
  • 1 : Flow Control Mode
  • 2 : Compensation Curve Mode
• DHWSP : Hot Water Setpoint (Temperature * 100)
• Z1SP : Zone 1 Setpoint (* 100)
• Z2SP : Zone 1 Setpoint (* 100)

Identified so far, this must do far more that this!

• Z1SP : Zone 1 Setpoint (* 100)

Active commands so far identified, 0x00 to 0xff. Commands not listed appear to generate no resaponse. Some command listed have empty, payload 0x00, response.

Active commands so far identified.

Responses so far identified.

• Y: Year
• M: Month
• D: Day
• h: Hour
• m: Minute
• s: Second

• CF : Compressor Frequency

• HWB : Hot Water Boost

• P : Heater Power (kW)

• Z1T : Zone1 Target Temperature * 100
• Z2T : Zone2 Target Temperature * 100;
• Z1SP : Zone 1 Flow SetFlow Setpoint * 100
• Z2SP : Zone 3 Flow SetFlow Setpoint * 100
• LSP : Legionella Setpoint * 100;
• HWD : DHW Max Temp Drop;

• Z1T : Zone1 Temperature * 100
• Z2T : Zone2 Temperature * 100
• O : Outside Temp +40 x 2

• OF : Heater Water Out Flow * 100
• RF : Heater Return Flow Temperature * 100
• HW : Hot Water Temperature * 100

• F : Boiler Flow Temperature * 100;
• R : Boiler Return Temperature * 100;

• PF : Primary Flow Rate (l/min)

• Pwr - Power
  • 0 : Standby
  • 1 : On
• OM Operation Mode
  • 0 : Off
  • 1 : Hot Water On
  • 2 : Heating On
  • 5 : Frost Protect
• HW - Hot Water Mode
  • 0 : Normal
  • 1 : Economy
• Op - Operation Mode:
  • 0 : Temperature Mode
  • 1 : Flow Control Mode
  • 2 : Compensation Curve Mode
• HWSP : HotWater SetPoint * 100;
• HSP : Heating Flow SetPoint * 100;
• SP : Unknown Setpoint:

• HM : Holiday Mode
• HT : Hot Water Timer

• Z1T : Zone1 Temperature * 100
• Z2T : Zone2 Temperature * 100

• Y: Year
• M: Month
• D: Day

• Y: Year
• M: Month
• D: Day