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