Motor Controllers AC Variable Frequency Drives Type VariFlex
3
RVLF
150 Specications are subject to change without notice. Pictures are just an example. For special features and/or customization, please ask to our sales network. 13/12/2017
ASCII Mode
RTU Mode
Instruction Message
Instruction Message
Response Message (Normal)
Response Message (Normal)
Response (Fault)
Response (Fault)
3AH STX
30H
SLAVE
Address
31H
30H
Function
Code
33H
41H
Start
Address
30H
32H
33H
30H
Quantity
30H
30H
31H
?
LRC CHECK
?
0DH
END
0AH
3AH STX
30H
SLAVE
Address
31H
30H
Function Code
33H
30H
DATA
Number
32H
31H
First
holding
register
37H
37H
30H
?
LRC CHECK
?
0DH
END
0AH
3AH STX
30H
SLAVE
Address
31H
38H
Function Code
33H
35H
Error Code
32H
?
LRC CHECK
?
0DH
END
0AH
SLAVE Address 01H
Function Code 03H
Start
Address
High A0H
Low 23H
Quantity
High 00H
Low 01H
CRC-16
High 57H
Low C0H
SLAVE Address 01H
Function Code 03H
DATA Number 02H
First
holding
register
High 07H
Low D0H
CRC-16
High BBH
Low E8H
SLAVE Address 01H
Function Code 83H
Error Code 52H
CRC-16
High C0H
Low CDH
Master unit reads the contents of the holding register with the continuous number for the
specified quantity.
Note:
1 Limit number of read data, RTU: 37, ASCII:17.
2 Can only continuous read the address of the same group
3 Read data quantity ≥1.
(Example) read the SLAVE station No: 01, RVLF drive’s frequency command.
4.3 Read the data in the holding register [03H]
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