Chapter 7 Specifications and Characters
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RTU
RTU
RTU
RTU Mode
Mode
Mode
Mode
:
Communication protocol data format instructions are as follows
:
STX
STX
STX
STX
(
communication
communication
communication
communication start
start
start
start
)
ASCII mode
:
‘: ’character
STX
Sleep interval of at least 4 bytes transmission time.
ADR
Communication address
=>
1-byte
CMD
Reference code
=>
1-byte
DATA(n-1)
Data content
=>
n-word=2n-byte
,
n
≦
12
……
DATA(0)
CRC
CRC checking code
=>
1-byte
End 1
Sleep interval of at least 4 bytes transmission time.