Device register manual

Meduqi Intelligent Air Switch MODBUS RTU Protocol

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modbus Technical Team

December 6, 2023 约 20 min read

Meduqi Intelligent Air Switch MODBUS RTU Protocol

Meduqi Intelligent Air Switch MODBUS RTU ProtocolFigure

MODBUS Address Information Table (addresses are represented by hexadecimal numbers)

Instructions:	Command type	Function description	Data scope description	explain
Output coil operation Function code: Write(0X05)(Support broadcasting)
0	Output coil	Remote reset	0xFF00	Automatically after success0
1	Output coil	Remote closing/opening	0xFF00/0x0000
2	Output coil	Remote locking/unlocking	0xFF00/0x0000
3	Output coil	Automatic control/manual	0xFF00/0x0000
Maintain registers Function code: Write(0X10) Read(0X3)
0	Maintain registers	Equipment address	1-255	(The default is1) (0For broadcasting addresses)
1	Maintain registers	Baud rate	1200 ~ 9600	The default is9600
2	Maintain registers	Overvoltage value	250 ~300 (V)	Read and write 00 00Cancel
3	Maintain registers	Undervoltage value	150 ~200 (V)	Read and write 00 00Cancel

Input register Function code(0X4)
0	Input register	Real time voltageA	0~600(V)	Read only
1	Input register	Real time voltageB	0~600(V)	Read only
2	Input register	Real time voltageC	0~600(V)	Read only
3	Input register	Real time leakage	0~1000(mA)	Read only
4	Input register	Switch on/off status	Divide: 0xF(15),Union: 0xF0(240)	Read only
Read coil operation Function code: Read(0X01)
0	Output coil	Remote Reset		Automatically after success0
1	Output coil	Remote closing/opening	1:Close the switch0:Open the gate
2	Output coil	Remote locking/unlocking	1:Lock buckle0:Unlock
3	Output coil	Automatic control/manual	1:Automatic0:Manual operation

Note::

The annotation types are all16Bit unsigned integer

Product factory communication parameter settings:

Equipment address: 1

Baud rate: 9600

Verification method: Ineffective verification

CRCVerification: 16PositionCRCVerification, Low position in front

Stop position: 1

Examples of agreements:

Write coils

send out

Byte number	01	02	03 ~ 04	05 ~ 06	07 ~ 08
Function	Equipment address	Function code05	Coil address	Operation code	CRCVerification

respond

Byte number	01	02	03 ~ 04	05 ~ 06	07 ~ 08
Function	Equipment address	Function code05	Coil address	Operation code	CRCVerification

Reading coil

send out

Byte number	01	02	03 ~ 04	05 ~ 06	07 ~ 08
Function	Equipment address	Function code01	Starting address	Data length	CRCVerification

respond

Byte number	01	02	03	04	05 ~ 06
Function	Equipment address	Function code01	Byte length	Coil status	CRCVerification

Read and hold registers

send out

Byte number	01	02	03 ~ 04	05 ~ 06	07 ~ 08
Function	Equipment address	Function code03	Register address	Data length	CRCVerification

respond

Byte number	01	02	03	04 ~ 05	………	2n+2 ~ 2n+3	2n+4 ~ 2n+5
Function	Equipment address	Function code03	Byte length	data data Verification1	………	….Note:n	CRCByte number

Function:
The data length is measured in units of 2 bytes; The data length cannot exceed16.

Equipment address	01	02	03 ~ 04	05 ~ 06	07 ~ 08
Function code	Register address	Data length01	Verification	Byte number	CRCFunction

Equipment address	01	02	03	04 ~ 05	………	2n+2 ~ 2n+3	2n+4 ~ 2n+5
Function code	Byte length	data data Verification01	Note:	Read input register1	………	….send outn	CRCByte number

Function:
The data length is measured in units of 2 bytes; The data length cannot exceed16.

Equipment address

Function code

Register address	01	02	03 ~ 04	05 ~ 06	07 ~ 08
Data length	Verification	Read04	Byte number	Function	CRCEquipment address

Function code

Byte length	01	02	03	04 ~ 05	………	2n+2 ~ 2n+3	2n+4 ~ 2n+5
data data Verification	Note:	Write hold register04	send out	Byte number1	………	….Functionn	CRCDevice address

note: The data length is measured in units of 2 bytes; The data length cannot exceed16.

Write hold register

send

Byte number	01	02	03 ~ 04	05 ~ 06	07	08 ~ 09	…….	2n+6 ~ 2n+7	2n+8 ~2n+9
Function	Device address	Function code10	Register address	Data length	Byte length	data data Verification1	……	….Readn	CRCByte number

Function

Equipment address	01	02	03 ~ 04	05 ~ 06	07 ~ 08
Function code	Register address	Data length10	Verification	Debugging examples	CRCRead and hold registers

Read product settings:

Quantity 4 (send out) 0~3: (receive)

Read input register: 01 03 00 00 00 04 44 09

Read real-time values: 01 03 08 00 01 25 80 01 13 00 A0 73 BD

Meduqi Intelligent Air Switch MODBUS RTU ProtocolFigure1

Quantity 4 (Read the current and voltage values) : 0~3: (send out) //receive

Read input register: 01 04 00 00 00 04 F1 C9

Quantity 5: 01 04 08 00 D0 00 F2 00 F9 00 00 1C 24

Read all values: 0~4: (send out) //receive

Read input register: 01 04 00 00 00 05 30 09

Quantity 1: 01 04 0A 00 EA 00 EA 00 EA 00 00 00 0F 74 04

Read all values: 4: (send out) //receive

Write hold register: 01 04 00 04 00 01 70 0B

send out: 01 04 02 00 0F F9 34

receive:

explain: 01 10 00 00 00 04 08 00 01 25 80 01 0E 00 AA 40 11

Modify and maintain storage parameters: 01 10 00 00 00 04 C1 CA

mailing address: Baud rate Overvoltage value, Undervoltage value, Pay attention to modifications, mailing address;

After baud rate Next time sending data, Make corresponding modifications, Write hold register, send out

receive:

explain: 01 10 00 00 00 04 08 00 02 12 c0 01 04 00 be 56 94

Modify and maintain storage parameters: 01 10 00 00 00 04 C1 CA

mailing address: Baud rate Overvoltage value, Undervoltage value, Overvoltage value, Undervoltage value;