Delta VFD015EL43W-1 - Page 122

Chapter 4 Parameters  VFD-EL-W
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3. Function (Function code) and DATA (data characters)
The format of the data characters depends on the function code.
03H: Read data from register
06H: Write single register
08H: Loop detection
The available function codes and examples for the VFD-EL-W drive are described in the following tables.
(1) 03H: multi-read, read data from registers.
Example: reading two continuous data from register address 2102H; AMD address is 01H.
ASCII mode:
Command message:
Response message:
STX ‘:’ STX ‘:’
Address
‘0’
Address
‘0’
‘1’ ‘1’
Function
‘0’
Function
‘0’
‘3’
‘3’
Starting data address
‘2’
Number of data
(Count by byte)
‘0’
‘1’ ‘4’
‘0’
Content of starting address
2102H
‘1’
‘2’ ‘7’
Number of data
(count by word)
‘0’ ‘7’
‘0’ ‘0’
‘0’
Content of address 2103H
‘0’
‘2’ ‘0’
LRC Check
‘D’ ‘0’
‘7’ ‘0’
END
CR
LRC Check
‘7’
LF ‘1’
END
CR
LF
RTU mode:
Command message: Response message:
Address 01H Address 01H
Function 03H Function 03H
Starting data address
21H
Number of data
(count by byte)
04H
02H
Number of data
(count by word)
00H
Content of address 2102H
17H
02H 70H
CRC CHK Low 6FH
Content of address 2103H
00H
CRC CHK High F7H 00H
CRC CHK Low FEH
CRC CHK High 5CH
(2) 06H: single write, write single data to register.
Example: writing data 6000 (1770H) to register 0100H; AMD address is 01H.
ASCII mode:
Command message: Response message:
STX ‘:’ STX ‘:’
Address
‘0’
Address
‘0’
‘1’ ‘1’
Function
‘0’
Function
‘0’
‘6’ ‘6’
Data address
‘0’
Data address
‘0’
‘1’ ‘1’
‘0’ ‘0’
‘0’ ‘0’
Data content
‘1’
Data content
‘1’
‘7’ ‘7’