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	Temperature
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

m000c400 / Mitsubishi-CN105-Protocol-Decode

readme

Mitsubishi-CN105-Protocol-Decode

Physical

Command Format

Header

Sync Byte

Packet Types

Length

Payload

Checksum

Set Request - Packet Type 0x41

Available Commands

0x32 - Set Options

0x35 - Set Zone 1 Setpoint

Get Request - Packet Type 0x42

Available Commands

Payload - All Commands

Set Response - Packet Type 0x61

Available Commands

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

Get Response - Packet Type 0x62

Resposes

0x01 - Time & Date

0x04 - Various Flags

0x05 - Various Flags

0x07

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

0x0b - Zone 1 & 2 and Outside Temperature

0x0c - Heater Flow Temps

0x0d - Boiler Temps

0x0e - Unknown Temps

0x14 - Primary Cct Flow Rate

0x26

0x28 - Various Flags

0x29 -

0xA1 - Consumed Energy

0xA2 - Delivered Energy