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Midea Home Multi split Air Conditioner Modbus Centralized Control Communication Protocol

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modbus Technical Team

2024年1月12日约 57 min read

Midea Home Multi split Air Conditioner Modbus Centralized Control Communication Protocol缩略图

Midea Home Multi split Air Conditioner Modbus Centralized Control Communication Protocol插图

1.Communication rules

0x02

n*128+30000+10

Remark

data bit: 8Bits

parity bit: None

stop bit: 1Bits

2. Command function code

function code	Function Name	Function
0x02	Read Discrete input Read discrete quantities	Read
0x04	Read Input Register Read input register	Read
0x06	Write Single Register Write a single register	Write

3. Abnormal reply

The master device sends a request and waits for a response from the slave device. When no errors occur, Reply normally from the device, If the data verification is incorrect, If the device does not reply. When the data sent by the main device is incorrect (Except for inspection errors) , Reply with abnormal code from the device.

Code	Name	meaning
0x01	Illegal function code	The received function code is not supported by the slave
0x02	Illegal data address	The received data address is not supported by the slave
0x03	Illegal data	The received data value is not supported by the slave

4. ModbusData frame description

Device address	function code	data	CRCVerification
1byte	1byte	Nbyte	2byte

4.1

0x02Read discrete input

Example: Assuming that the address of the discrete quantity register in Unit 2 is read as10257~10259the data;

Starting address=Register address-10001=10257-10001=256, namely0x0100

2Number in machine10257~10259The actual address is0~2, The number of discrete inputs is3

Request message: 00 02 01 00 00 03 38 26

response message: 00 02 01 05 60 77

Request message		response message
domain name	(hexadecimal)	domain name	(hexadecimal)
Device address	00	Device address	00
function code	02	function code	02
Starting address high byte	01	byte count	01
Low byte starting address	00	input state7-0	05
Discrete input quantity high byte	00	Low bit of verification code	60
Discrete input quantity low byte	03	High bit of verification code	77
Low byte checksum	38
High byte checksum	26

What is the input status byte in the reply message05, The corresponding binary is00000101, 0~2The data for the address are as follows:101.View Address Mapping Table, Power on1, Fault status0, Online status1.

4.2

0x04Read input register

Example: Read the input register address of internal machine 0 as30001~30013

Starting address=Register address-30001=30001-30001=0, namely0x00

0Number in machine30001~30013The actual address is0~12,The number of input registers is13

Request message: 00 04 00 00 00 0D 30 1E

response message: 00 04 1A 00 01 00 00 00 00 00 54 00 64 00 1E FF FF 00 6B 00 6E 00 00 00 00 00 00 00 00 0B D7

Request message		response message
domain name	(hexadecimal)	domain name	(hexadecimal)
Device address	00	Device address	00
function code	04	function code	04
Starting address high byte	00	byte count	1A
Low byte starting address	00	Input register 1 high byte	00
Input register quantity high byte	00	Input register 1 low byte	01
Low byte input register quantity	0D	Input register 2 high byte	00
Low byte checksum	30	Input register 2 low byte	00
High byte checksum	1E	Input register 3 high bytes	00
		Input register 3 low byte	00
		Input register 4 high bytes	00
		Input register 4 low byte	54
		Input register 5 high bytes	00
		Input register 5 low byte	64
		Input register 6 high bytes	00
		Input register 6 low byte	1E
		Input register 7 high bytes	FF
		Input register 7 low byte	FF
		Input register 8 high bytes	00
		Input register 8 low byte	6B
		Input register 9 high byte	00
		Input register 9 low byte	6E
		input register10high byte	00
		input register10low-order byte	00
		input register11high byte	00
		input register11low-order byte	00
		input register12high byte	00
		input register12low-order byte	00
		input register13high byte	00
		input register13low-order byte	00
		Low byte checksum	0B
		High byte checksum	D7

Query the number of input registers as13 (0x0D) , Therefore, the number of bytes in the response message is26 (0x1A) (The value of an input register consists of two bytes) , The specific meaning of the input register values can be viewed in the address mapping table.

4.3

0x06Write a single register

Example: What is the register address for controlling the power on/off of Unit 040001, The startup parameters are1

Starting address=Register address-40001=40001-40001=0, namely0x00

The register setting parameter is1, Power on

Request message: 00 06 00 00 00 01 49 DB

response message: 00 06 00 00 00 01 49 DB

Request message		response message
domain name	(hexadecimal)	domain name	(hexadecimal)
Device address	00	Device address	00
function code	06	function code	06
Register address high byte	00	Output address high byte	00
Low byte register address	00	Output address low byte	00
Register value high byte	00	Output value high byte	00
Register value low byte	01	Output value low byte	01
Low byte checksum	49	Low byte checksum	49
High byte checksum	DB	High byte checksum	DB

Another example: What is the register address for controlling the hot mode of mechanism 040002, The heating parameters are02

Starting address=Register address-40001=40002-40001=1, namely0x01

Request message: 00 06 00 01 00 02 58 1A

response message: 00 06 00 01 00 02 58 1A

Request message		response message
domain name	(hexadecimal)	domain name	(hexadecimal)
Device address	00	Device address	00
function code	06	function code	06
Register address high byte	00	Output address high byte	00
Low byte register address	01	Output address low byte	01
Register value high byte	00	Output value high byte	00
Register value low byte	02	Output value low byte	02
Low byte checksum	58	Low byte checksum	58
High byte checksum	1A	High byte checksum	1A

5. Internal and External Machine Variable Mapping Table

Communication rules
communication method:	MODBUS
Baud rate:	9600Bps
start position:	1Bit
data bit:	8Bits
parity bit:	None
stop bit:	1Bit

ModbusData frame description
Device address	function code	data	CRCVerification
1byte	1byte	Nbyte	2byte

Command function code
function code	Function Name	Function
0x02	Read Discrete input Read discrete quantities	Read
0x04	Read Input Register Read input register	Read
0x06	Write Single Register Write a single register	Write


0x02Read discrete input		0x04Read input register		0x06Write a single register
host	Slave	host	Slave	host	Slave
Request message	response message	Request message	response message	Request message	response message
Device address	Device address	Device address	Device address	Device address	Device address
function code	function code	function code	function code	function code	function code
Starting address high byte	byte count	Starting address high byte	byte countN	Register address high byte	Output address high byte
Low byte starting address	input state7-0	Low byte starting address	Input register 1 high byte	Low byte register address	Output address low byte
Discrete input quantity high byte	CRC16Low bit of verification code	Input register quantity high byte	Input register 1 low byte	Register value high byte	Output value high byte
Discrete input quantity low byte	CRC16High bit of verification code	Low byte input register quantity	Input register 2 high byte	Register value low byte	Output value low byte
CRC16Low byte checksum		CRC16Low byte checksum	Input register 2 low byte	CRC16Low byte checksum	CRC16Low byte checksum
CRC16High byte checksum		CRC16High byte checksum	Input register 3 high bytes	CRC16High byte checksum	CRC16High byte checksum
			Input register 3 low byte
			---------------
			input registerN/2high byte
			input registerN/2low-order byte
			CRC16Low byte checksum
			CRC16High byte checksum
			(note: N=Input the number of registers*2)


Abnormal reply				Reply from the machine in case of abnormality
Code	Name	meaning		Device address
0x01	Illegal function code	The received function code is not supported by the slave		function code\|FUNC_ERROR (128)
0x02	Illegal data address	The received data address is not supported by the slave		Abnormal reply code
0x03	Illegal data	The received data value is not supported by the slave		CRC16Low byte checksum
				CRC16High byte checksum
The master device sends a request and waits for a response from the slave device. When no errors occur, Reply normally from the device, If the data verification is incorrect, If the device does not reply. When the data sent by the main device is incorrect (function code, data address, Data is invalid) , Reply with abnormal code from the device.

Command type	Internal address	register address	variable name	data length	meaning
Read discrete quantities 0x02	0Number in machine	10001	Power on	1bit	0:Shutdown; 1: Power on
		10002	Fault	1bit	0:fault-free; 1: Faulty
		10003	Online status	1bit	0:offline; 1: online
		10004		1bit	reserve
		10005		1bit	reserve
		10006		1bit	reserve
		10007		1bit	reserve
		10008		1bit	reserve
		10009-10128	reserve
	1Number in machine	10129	Power on	1bit	0:Shutdown; 1: Power on
		10130	Fault	1bit	0:fault-free; 1: Faulty
		10131	Online status	1bit	0:offline; 1: online
		10132		1bit	reserve
		10133		1bit	reserve
		10134		1bit	reserve
		10135		1bit	reserve
		10136		1bit	reserve
		10137-10256	reserve
	nNumber in machine	n*128+10000+1	Power on	1bit	0:Shutdown; 1: Power on
		n*128+10000+2	Fault	1bit	0:fault-free; 1: Faulty
		n*128+10000+3	Online status	1bit	0:offline; 1: online
		n*128+10000+4		1bit	reserve
		n*128+10000+5		1bit	reserve
		n*128+10000+6		1bit	reserve
		n*128+10000+7		1bit	reserve
		n*128+10000+8		1bit	reserve
		n128+10000+9--n128+10000+128	reserve
	63Number in machine	18065	Power on	1bit	0:Shutdown; 1: Power on
		18066	Fault	1bit	0:fault-free; 1: Faulty
		18067	Online status	1bit	0:offline; 1: online
		18068		1bit	reserve
		18069		1bit	reserve
		18070		1bit	reserve
		18071		1bit	reserve
		18072		1bit	reserve
		18073-18192	reserve
Read discrete quantities 0x02 (note: Currently, only Unit 0 is open for external use)	0Extra phone	18193	Power on	1bit	0:Shutdown; 1: Power on
		18194	Fault	1bit	0:fault-free; 1: Faulty
		18195	Online status	1bit	0:offline; 1: online
		18196		1bit	reserve
		18197		1bit	reserve
		18198		1bit	reserve
		18199		1bit	reserve
		18200		1bit	reserve
		18201-18320	reserve
	1Extra phone	18321	Power on	1bit	0:Shutdown; 1: Power on
		18322	Fault	1bit	0:fault-free; 1: Faulty
		18323	Online status	1bit	0:offline; 1: online
		18324		1bit	reserve
		18325		1bit	reserve
		18326		1bit	reserve
		18327		1bit	reserve
		18328		1bit	reserve
		18329-18448	reserve
	nExtra phone	n*128+18192+1	Power on	1bit	0:Shutdown; 1: Power on
		n*128+18192+2	Fault	1bit	0:fault-free; 1: Faulty
		n*128+18192+3	Online status	1bit	0:offline; 1: online
		n*128+18192+4		1bit	reserve
		n*128+18192+5		1bit	reserve
		n*128+18192+6		1bit	reserve
		n*128+18192+7		1bit	reserve
		n*128+18192+8		1bit	reserve
		n128+18192+9--n128+18192+128	reserve
	3Extra phone	18577	Power on	1bit	0:Shutdown; 1: Power on
		18578	Fault	1bit	0:fault-free; 1: Faulty
		18579	Online status	1bit	0:offline; 1: online
		18580		1bit	reserve
		18581		1bit	reserve
		18582		1bit	reserve
		18583		1bit	reserve
		18584		1bit	reserve
		18585-18704	reserve

Command type	Internal address	register address	variable name	data length	meaning	Remark
Read input register 0x04	0Number in machine	30001	Indoor unit type	2Bytes	1: Ducted Air Conditioner; 2: fresh air ventilator; 3: hydraulic module; 4, Humidifier
		30002	Operation Mode	2Bytes	0:Shutdown; 1-refrigeration; 2-heating; 3-air supply; 4-Dehumidification; 5-reserve; 6-Forced Cooling; 7-defrost; 10-self-cleaning; 11-Dehumidification and reheating; 12-Automatic dehumidification	Some models only have partial modes
		30003	Wind speed	2Bytes	Internal fan speed
		30004	set temperature	2Bytes	(Actual set temperature*2) +50, The actual set temperature range is[16,30]
		30005	Indoor ambient temperature	2Bytes	(Actual temperature value*2) +50
		30006	Indoor environmental humidity	2Bytes	Actual humidity value	Some models are not available
		30007	T2temperature	2Bytes	(Actual temperature value*2) +50	Some models are not available
		30008	T2Atemperature	2Bytes	(Actual temperature value*2) +50	Some models are not available
		30009	T2Btemperature	2Bytes	(Actual temperature value*2) +50	Some models are not available
		30010	T2Ctemperature	2Bytes	(Actual temperature value*2) +50	Some models are not available
		30011	T2Dtemperature	2Bytes	(Actual temperature value*2) +50	Some models are not available
		30012	Opening degree of indoor main expansion valve	2Bytes
		30013	Indoor auxiliary expansion valve opening	2Bytes		Some models are not available
		30014-30128	reserve
	1Number in machine	30129	Indoor unit type	2Bytes	1: Ducted Air Conditioner; 2: fresh air ventilator; 3: hydraulic module; 4, Humidifier
		30130	Operation Mode	2Bytes	0:Shutdown; 1-refrigeration; 2-heating; 3-air supply; 4-Dehumidification; 5-reserve; 6-Forced Cooling; 7-defrost; 10-self-cleaning; 11-Dehumidification and reheating; 12-Automatic dehumidification	Some models only have partial modes
		30131	Wind speed	2Bytes	Internal fan speed
		30132	set temperature	2Bytes	(Actual set temperature*2) +50, The actual set temperature range is[16,30]
		30133	Indoor ambient temperature	2Bytes	(Actual temperature value*2) +50
		30134	Indoor environmental humidity	2Bytes	Actual humidity value	Some models are not available
		30135	T2temperature	2Bytes	(Actual temperature value*2) +50	Some models are not available
		30136	T2Atemperature	2Bytes	(Actual temperature value*2) +50	Some models are not available
		30137	T2Btemperature	2Bytes	(Actual temperature value*2) +50	Some models are not available
		30138	T2Ctemperature	2Bytes	(Actual temperature value*2) +50	Some models are not available
		30139	T2Dtemperature	2Bytes	(Actual temperature value*2) +50	Some models are not available
		30140	Opening degree of indoor main expansion valve	2Bytes
		30141	Indoor auxiliary expansion valve opening	2Bytes		Some models are not available
		30142-30256	reserve
	nNumber in machine	n*128+30000+1	Indoor unit type	2Bytes	1: Ducted Air Conditioner; 2: fresh air ventilator; 3: hydraulic module; 4, Humidifier
		n*128+30000+2	Operation Mode	2Bytes	0:Shutdown; 1-refrigeration; 2-heating; 3-air supply; 4-Dehumidification; 5-reserve; 6-Forced Cooling; 7-defrost; 10-self-cleaning; 11-Dehumidification and reheating; 12-Automatic dehumidification	Some models only have partial modes
		n*128+30000+3	Wind speed	2Bytes	Internal fan speed
		n*128+30000+4	set temperature	2Bytes	(Actual set temperature*2) +50, The actual set temperature range is[16,30]
		n*128+30000+5	Indoor ambient temperature	2Bytes	(Actual temperature value*2) +50
		n*128+30000+6	Indoor environmental humidity	2Bytes	Actual humidity value	Some models are not available
		n*128+30000+7	T2temperature	2Bytes	(Actual temperature value*2) +50	Some models are not available
		n*128+30000+8	T2Atemperature	2Bytes	(Actual temperature value*2) +50	Some models are not available
		n*128+30000+9	T2Btemperature	2Bytes	(Actual temperature value*2) +50	Some models are not available
		n*128+30000+10	T2Ctemperature	2Bytes	(Actual temperature value*2) +50	Some models are not available
		n*128+30000+11	T2Dtemperature	2Bytes	(Actual temperature value*2) +50	Some models are not available
		n*128+30000+12	Opening degree of indoor main expansion valve	2Bytes
		n*128+30000+13	Indoor auxiliary expansion valve opening	2Bytes		Some models are not available
		n128+30000+14-n128+30000+128	reserve
	63Number in machine	38065	Indoor unit type	2Bytes	1: Ducted Air Conditioner; 2: fresh air ventilator; 3: hydraulic module; 4, Humidifier
		38066	Operation Mode	2Bytes	0:Shutdown; 1-refrigeration; 2-heating; 3-air supply; 4-Dehumidification; 5-reserve; 6-Forced Cooling; 7-defrost; 10-self-cleaning; 11-Dehumidification and reheating; 12-Automatic dehumidification	Some models only have partial modes
		38067	Wind speed	2Bytes	Internal fan speed
		38068	set temperature	2Bytes	(Actual set temperature*2) +50, The actual set temperature range is[16,30]
		38069	Indoor ambient temperature	2Bytes	(Actual temperature value*2) +50
		38070	Indoor environmental humidity	2Bytes	Actual humidity value	Some models are not available
		38071	T2temperature	2Bytes	(Actual temperature value*2) +50	Some models are not available
		38072	T2Atemperature	2Bytes	(Actual temperature value*2) +50	Some models are not available
		38073	T2Btemperature	2Bytes	(Actual temperature value*2) +50	Some models are not available
		38074	T2Ctemperature	2Bytes	(Actual temperature value*2) +50	Some models are not available
		38075	T2Dtemperature	2Bytes	(Actual temperature value*2) +50	Some models are not available
		38076	Opening degree of indoor main expansion valve	2Bytes
		38077	Indoor auxiliary expansion valve opening	2Bytes		Some models are not available
		38078-38192	reserve
input register 0x04 (note: Currently, only Unit 0 is open for external use)	0Extra phone	38193	Operation Mode	2Bytes	0:Shutdown; 1-refrigeration; 2-heating; 3-air supply; 4-Dehumidification; 5-reserve; 6-Forced Cooling; 7-defrost; 10-self-cleaning; 11-Dehumidification and reheating; 12-Automatic dehumidification	Some models only have partial modes
		38194	Outdoor ambient temperature	2Bytes	(Actual temperature value*2) +50
		38195	condenser temperature	2Bytes	(Actual temperature value*2) +50
		38196	exhaust gas temperature	2Bytes	Actual temperature value
		38197	IPMModule Temperature	3Bytes	Actual temperature value	Some models are not available
		38198	Temperature of refrigerant pipe	2Bytes	(Actual temperature value*2) +50	Some models are not available
		38199	Spray enthalpy inlet temperature	2Bytes	(Actual temperature value*2) +50	Some models are not available
		38200	Spray enthalpy outlet temperature	2Bytes	(Actual temperature value*2) +50	Some models are not available
		38201	Temperature of subcooled liquid pipe	2Bytes	(Actual temperature value*2) +50	Some models are not available
		38202	Return air temperature	2Bytes	(Actual temperature value*2) +50	Some models are not available
		38203	voltage value	2Bytes	AC voltageADValue
		38204	current value	2Bytes	currentADValue
		38205	Opening degree of main expansion valve	2Bytes	Actual opening value
		38206	Opening degree of auxiliary expansion valve	2Bytes	Actual opening value	Some models are not available
		38207	Current external centralized control version	2Bytes	Current external machine centralized control version number
		38208-38320	reserve
	1Extra phone	38321	Operation Mode	2Bytes	0:Shutdown; 1-refrigeration; 2-heating; 3-air supply; 4-Dehumidification; 5-reserve; 6-Forced Cooling; 7-defrost; 10-self-cleaning; 11-Dehumidification and reheating; 12-Automatic dehumidification	Some models only have partial modes
		38322	Outdoor ambient temperature	2Bytes	(Actual temperature value*2) +50
		38323	condenser temperature	2Bytes	(Actual temperature value*2) +50
		38324	exhaust gas temperature	2Bytes	Actual temperature value
		38325	IPMModule Temperature	3Bytes	Actual temperature value	Some models are not available
		38326	Temperature of refrigerant pipe	2Bytes	(Actual temperature value*2) +50	Some models are not available
		38327	Spray enthalpy inlet temperature	2Bytes	(Actual temperature value*2) +50	Some models are not available
		38328	Spray enthalpy outlet temperature	2Bytes	(Actual temperature value*2) +50	Some models are not available
		38329	Temperature of subcooled liquid pipe	2Bytes	(Actual temperature value*2) +50	Some models are not available
		38330	Return air temperature	2Bytes	(Actual temperature value*2) +50	Some models are not available
		38331	voltage value	2Bytes	AC voltageADValue
		38332	current value	2Bytes	currentADValue
		38333	Opening degree of main expansion valve	2Bytes	Actual opening value
		38334	Opening degree of auxiliary expansion valve	2Bytes	Actual opening value	Some models are not available
		38335	Current external centralized control version	2Bytes	Current external machine centralized control version number
		38336-38448	reserve
	nExtra phone	n*128+38192+1	Operation Mode	2Bytes	0:Shutdown; 1-refrigeration; 2-heating; 3-air supply; 4-Dehumidification; 5-reserve; 6-Forced Cooling; 7-defrost; 10-self-cleaning; 11-Dehumidification and reheating; 12-Automatic dehumidification	Some models only have partial modes
		n*128+38192+2	Outdoor ambient temperature	2Bytes	(Actual temperature value*2) +50
		n*128+38192+3	condenser temperature	2Bytes	(Actual temperature value*2) +50
		n*128+38192+4	exhaust gas temperature	2Bytes	Actual temperature value
		n*128+38192+5	IPMModule Temperature	3Bytes	Actual temperature value	Some models are not available
		n*128+38192+6	Temperature of refrigerant pipe	2Bytes	(Actual temperature value*2) +50	Some models are not available
		n*128+38192+7	Spray enthalpy inlet temperature	2Bytes	(Actual temperature value*2) +50	Some models are not available
		n*128+38192+8	Spray enthalpy outlet temperature	2Bytes	(Actual temperature value*2) +50	Some models are not available
		n*128+38192+9	Temperature of subcooled liquid pipe	2Bytes	(Actual temperature value*2) +50	Some models are not available
		n*128+38192+10	Return air temperature	2Bytes	(Actual temperature value*2) +50	Some models are not available
		n*128+38192+11	voltage value	2Bytes	AC voltageADValue
		n*128+38192+12	current value	2Bytes	currentADValue
		n*128+38192+13	Opening degree of main expansion valve	2Bytes	Actual opening value
		n*128+38192+14	Opening degree of auxiliary expansion valve	2Bytes	Actual opening value	Some models are not available
		n*128+38192+15	Current external centralized control version	2Bytes	Current external machine centralized control version number
		n128+38192+16-n128+38192+128	reserve
	3Extra phone	38577	Operation Mode	2Bytes	0:Shutdown; 1-refrigeration; 2-heating; 3-air supply; 4-Dehumidification; 5-reserve; 6-Forced Cooling; 7-defrost; 10-self-cleaning; 11-Dehumidification and reheating; 12-Automatic dehumidification	Some models only have partial modes
		38578	Outdoor ambient temperature	2Bytes	(Actual temperature value*2) +50
		38579	condenser temperature	2Bytes	(Actual temperature value*2) +50
		38580	exhaust gas temperature	2Bytes	Actual temperature value
		38581	IPMModule Temperature	3Bytes	Actual temperature value	Some models are not available
		38582	Temperature of refrigerant pipe	2Bytes	(Actual temperature value*2) +50	Some models are not available
		38583	Spray enthalpy inlet temperature	2Bytes	(Actual temperature value*2) +50	Some models are not available
		38584	Spray enthalpy outlet temperature	2Bytes	(Actual temperature value*2) +50	Some models are not available
		38585	Temperature of subcooled liquid pipe	2Bytes	(Actual temperature value*2) +50	Some models are not available
		38586	Return air temperature	2Bytes	(Actual temperature value*2) +50	Some models are not available
		38587	voltage value	2Bytes	AC voltageADValue
		38588	current value	2Bytes	currentADValue
		38589	Opening degree of main expansion valve	2Bytes	Actual opening value
		38590	Opening degree of auxiliary expansion valve	2Bytes	Actual opening value	Some models are not available
		38591	Current external centralized control version	2Bytes	Current external machine centralized control version number
		38592-38704	reserve

Command type	Internal address	register address	variable name	data length	meaning	Remark
Write a single register 0x06	0Number in machine	40001	Set on/off switch	2Bytes	0:Shutdown; 1: Power on
		40002	Set Mode	2Bytes	0:Shutdown; 1-refrigeration; 2-heating; 3-air supply; 4-Dehumidification; 5-Automatic; 6-Forced Cooling; 11-Dehumidification and reheating; 12-Automatic dehumidification; Other reservations Set automatic mode, When in dehumidification mode, The set wind speed needs to be set to102-Automatic wind	Some models only have partial modes
		40003	Set wind speed	2Bytes	1~100-Infinite wind speed gear; 102-Automatic wind
		40004	set temperature	2Bytes	(Actual temperature value*2) +50
		40005	Timed opening time	2Bytes	1Representing 1 minute	Some models are not available
		40006	Timed shutdown time	2Bytes	1Representing 1 minute	Some models are not available
		40007	Set target humidification humidity	2Bytes	1~100-1%~100%	Some models are not available
		40008	Set target dehumidification humidity	2Bytes	1~100-1%~100%	Some models are not available
		40019-40128
	1Number in machine	40129	Set on/off switch	2Bytes	0:Shutdown; 1: Power on
		40130	Set Mode	2Bytes	0:Shutdown; 1-refrigeration; 2-heating; 3-air supply; 4-Dehumidification; 5-Automatic; 6-Forced Cooling; 11-Dehumidification and reheating; 12-Automatic dehumidification; Other reservations Set automatic mode, When in dehumidification mode, The set wind speed needs to be set to102-Automatic wind	Some models only have partial modes
		40131	Set wind speed	2Bytes	1~100-Infinite wind speed gear; 102-Automatic wind
		40132	set temperature	2Bytes	(Actual temperature value*2) +50
		40133	Timed opening time	2Bytes	1Representing 1 minute	Some models are not available
		40134	Timed shutdown time	2Bytes	1Representing 1 minute	Some models are not available
		40135	Set target humidification humidity	2Bytes	1~100-1%~100%	Some models are not available
		40136	Set target dehumidification humidity	2Bytes	1~100-1%~100%	Some models are not available
		40137-40256
	nNumber in machine	n*128+40000+1	Set on/off switch	2Bytes	0:Shutdown; 1: Power on
		n*128+40000+2	Set Mode	2Bytes	0:Shutdown; 1-refrigeration; 2-heating; 3-air supply; 4-Dehumidification; 5-Automatic; 6-Forced Cooling; 11-Dehumidification and reheating; 12-Automatic dehumidification; Other reservations Set automatic mode, When in dehumidification mode, The set wind speed needs to be set to102-Automatic wind	Some models only have partial modes
		n*128+40000+3	Set wind speed	2Bytes	1~100-Infinite wind speed gear; 102-Automatic wind
		n*128+40000+4	set temperature	2Bytes	(Actual temperature value*2) +50
		n*128+40000+5	Timed opening time	2Bytes	1Representing 1 minute	Some models are not available
		n*128+40000+6	Timed shutdown time	2Bytes	1Representing 1 minute	Some models are not available
		n*128+40000+7	Set target humidification humidity	2Bytes	1~100-1%~100%	Some models are not available
		n*128+40000+8	Set target dehumidification humidity	2Bytes	1~100-1%~100%	Some models are not available
		n128+40000+9-n128+40000+128
	63Number in machine	408065	Set on/off switch	2Bytes	0:Shutdown; 1: Power on
		408066	Set Mode	2Bytes	0:Shutdown; 1-refrigeration; 2-heating; 3-air supply; 4-Dehumidification; 5-Automatic; 6-Forced Cooling; 11-Dehumidification and reheating; 12-Automatic dehumidification; Other reservations Set automatic mode, When in dehumidification mode, The set wind speed needs to be set to102-Automatic wind	Some models only have partial modes
		408067	Set wind speed	2Bytes	1~100-Infinite wind speed gear; 102-Automatic wind
		408068	set temperature	2Bytes	(Actual temperature value*2) +50
		408069	Timed opening time	2Bytes	1Representing 1 minute	Some models are not available
		408070	Timed shutdown time	2Bytes	1Representing 1 minute	Some models are not available
		408071	Set target humidification humidity	2Bytes	1~100-1%~100%	Some models are not available
		408072	Set target dehumidification humidity	2Bytes	1~100-1%~100%	Some models are not available
		408073-408192

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Midea Home Multi split Air Conditioner Modbus Centralized Control Communication Protocol

1.Communication rules

2. Command function code

3. Abnormal reply

4. ModbusData frame description

5. Internal and External Machine Variable Mapping Table

Turn this article into actionable debugging resources

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1.Communication rules

2. Command function code

3. Abnormal reply

4. ModbusData frame description

5. Internal and External Machine Variable Mapping Table

Turn this article into actionable debugging resources

Related Resources

Leave a Reply Cancel reply