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4. Operation Method
RS485 Communication Function
4.4 Reply Message Structures
4.4.1 Reply Messages to Read Request Messages
S
T
X
□
□
A
C
K
□
□
□
□
□
□
□
□
E
T
X
B
C
C
① ② ⑧ ④ ⑤ ⑥ ⑦
4.4.2 Reply Messages to Write Request/Storage Request Messages
S
T
X
□
□
A
C
K
E
T
X
B
C
C
① ② ⑧ ⑥ ⑦
4.4.3 Reply Messages In Case of an Error
S
T
X
□
□
N
A
K
□
E
T
X
B
C
C
① ② ⑨ ⑩ ⑥ ⑦
①
Start code
②
Address
④
Identifier
⑤
Numeric data
⑥
End code
⑦
BCC data
⑧
Acknowledgement
code
①
Start code
②
Address
⑥
End code
⑦
BCC data
⑧
Acknowledgement
code
①
Start code
②
Address
⑥
End code
⑦
BCC data
⑨
Negative
acknowledgement
code
⑩
ERR type
