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CMD (Command code) and DATA (data characters)
The format of data characters depends on the command code. The available
command codes are described as followed: Command code: 03H, read N words.
The maximum value of N is 20. For example, reading continuous 2 words from
starting address 2102H of AMD with address 01H.
ASCII mode:
RTU mode:
GS1 Series AC Drive User Manual
5–19
Chapter 5: GS1 MODBUS Communications
Response Message
ADR 01H
CMD 03H
Number of data
(Count by byte)
04H
'0'
Content of data
address 2102H
17H
70H
Content of data
address 2103H
00H
02H
CRC CHK Low
CRC CHK High
FEH
5CH
Command Message
ADR 01H
CMD 03H
Starting data
address
21H
02H
Number of data
(Count by word)
00H
02H
CRC CHK Low
CRC CHK High
6FH
F7H
Response Message
STX ':' ':'
ADR 1
ADR 0
'0'
'1'
CMD 1
CMD 0
'0'
'3'
Number of data
(Count by byte)
'0'
'4'
Content of starting
data address
2102H
'1'
'7'
'7'
'0'
Content data
address 2103H
'0'
'0'
'0'
'0'
LRC CHK 1
LRC CHK 0
'7'
'1'
END 1
END 0
CR
LF
Command Message
STX ':'
ADR 1
ADR 0
'0'
'1'
CMD 1
CMD 0
'0'
'3'
Starting data
address
'2'
'1'
'0'
'2'
Number of data
(Count by word)
'0'
'0'
'0'
'2'
LRC CHK 1
LRC CHK 0
'D'
'7'
END 1
END 0
CR
LF