Chapter 9 Communications
RTU Mode:
Start A silent interval of more than 10ms
Slave Address Communication address: 1-byte
Function Function code: 1-byte
Data (n-1)
…….
Data (0)
Contents of data: n word = n x 2-byte, n
12
CRC Error checking: 1-byte
End 1 A silent interval of more than 10ms
The communication protocol of RTU mode starts from a signal of silent interval and ends at a
signal of silent interval as well. There are communication address, function code, contents of
data and CRC (Cyclical Redundancy Check) between Start and End.
Revision January 2011 9-7
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