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Mitsubishi-CN105-Protocol-Decode

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

Physical

Serial, 2400, 8, E, 1

Command Format

Header Payload Checksum
5 Bytes 16 Bytes 1 Byte

Header

Sync Byte Packet Type Uknown Unknown Payload Size
0xfc Type 0x02 0x7a Length

Sync Byte

0xfc

Packet Types

Value Packet Type Direction
0x41 Set Request To Heat Pump
0x61 Set Response From Heat Pump
0x42 Get Request To Heat Pump
0x62 Get Response From Heat Pump
0x5A Connect Request To Heat Pump
0x7A Connect Response From Heat Pump
0x5B Extended Connect Request To Heat Pump
0x7B Extended Connect Responce To Heat Pump

Length

Payload Size (Bytes)

Payload

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Command x x x x x x x x x x x x x x x x

Checksum

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

Set Request - Packet Type 0x41

Available Commands

Active commands so far identified.

Command Brief Description
0x32 Update Settings
0x34 Hot Water
0x35 Unknown

0x32 - Set Options

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
0x32 Flags Z P DHW HC1 HC2 DHWSP DHWSP Z1SP Z1SP Z2SP Z2SP
  • 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)

0x35 - Set Zone 1 Setpoint

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

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
0x35 0x02 Z1SP Z1SP
  • Z1SP : Zone 1 Setpoint (* 100)

Get Request - Packet Type 0x42

Available Commands

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

Command Brief Description
0x01 Time & Date
0x02 Unknown
0x03 Unknown
0x04 Unknown - Empty Response
0x05 Hot Water Boot Flag
0x06 Unknown - Empty Response
0x06 Unknown - Empty Response
0x07 Unknown
0x08 Unknown
0x09 Zone 1 & 2 Temperatures and Setpoints, Hot Water Setpoint
0x0b Zone 1 & 2 and Outside
0x0c Water Flow Temperatures
0x0d Boiler Flow Temperatures
0x0e Unknown
0x10 Unknown
0x11 Unknown
0x13 Unknown
0x14 Unknown
0x15 Unknown
0x16 Unknown - Empty Response
0x17 Unknown - Empty Response
0x18 Unknown - Empty Response
0x19 Unknown - Empty Response
0x1a Unknown - Empty Response
0x1c Unknown - Empty Response
0x1d Unknown - Empty Response
0x1e Unknown - Empty Response
0x1f Unknown - Empty Response
0x20 Unknown - Empty Response
0x26 Various Operantion Mode Flags
0x27 Unknown
0x28 Various Operantion Mode Flags
0x29 Zone 1 & 2 Temperatures
0xa1 Unknown
0xa2 Unknown
0xa3 Unknown - Empty Response

Payload - All Commands

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Command 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

Set Response - Packet Type 0x61

Available Commands

Active commands so far identified.

Command Brief Description
0x00 OK

0x00 - OK , Command OK, or Just Format?

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Command 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

Get Response - Packet Type 0x62

Resposes

Responses so far identified.

Command Brief Description
0x01 Time & Date
0x05 Various Flags
0x09 Zone 1 & 2 Temperatures and Setpoints, Hot Water Setpoint
0x0b Zone 1 & 2 and Outside Temperature
0x0c Water Flow Temperatures
0x0d Boiler Flow Temperatures
0x26 Various Operantion Mode Flags
0x28 Various Operantion Mode Flags
0x29 Zone 1 & 2 Temperatures

0x01 - Time & Date

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
0x01 Y M D h m s
  • Y: Year
  • M: Month
  • D: Day
  • h: Hour
  • m: Minute
  • s: Second

0x04 - Various Flags

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
0x04 CF
  • CF : Compressor Frequency

0x05 - Various Flags

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
0x05 HWB
  • HWB : Hot Water Boost

0x07

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
0x07 P
  • P : Heater Power (kW)

0x09 - Zone 1 & 2 Temperatures and Setpoints, Hot Water Setpoint

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
0x09 Z1T Z1T Z2T Z2T Z1ST Z1SP Z2SP Z2SP LSP LSP HWD ? ?
  • 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;

0x0b - Zone 1 & 2 and Outside Temperature

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
0x0b Z1T Z1T ? ? Z2T Z2T O
  • Z1T : Zone1 Temperature * 100
  • Z2T : Zone2 Temperature * 100
  • O : Outside Temp +40 x 2

0x0c - Heater Flow Temps

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
0x0c OF OF RF RF HW HW
  • OF : Heater Water Out Flow * 100
  • RF : Heater Return Flow Temperature * 100
  • HW : Hot Water Temperature * 100

0x0d - Boiler Temps

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
0x0d F F R R
  • F : Boiler Flow Temperature * 100;
  • R : Boiler Return Temperature * 100;

0x0e - Unknown Temps

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
0x0e
Several Unknown Temperatures

0x14 - Primary Cct Flow Rate

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
0x14 PF
  • PF : Primary Flow Rate (l/min)

0x26

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14
Pwr OM HW Op HWPS HWSP HSP HSP SP SP
  • 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:

0x28 - Various Flags

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
0x28 HM HT
  • HM : Holiday Mode
  • HT : Hot Water Timer

0x29 -

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
0x29 Z1T Z1T Z2T Z2T
  • Z1T : Zone1 Temperature * 100
  • Z2T : Zone2 Temperature * 100

0xA1 - Consumed Energy

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
0xA1 Y M D Heat Cool DHW
  • Y: Year
  • M: Month
  • D: Day

0xA2 - Delivered Energy

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
0xA2 Y M D Heat Cool DHW
  • Y: Year
  • M: Month
  • D: Day