Delta ASDA-A2 Series User Manual page 584

Chapter 9 Communications
RTU Mode:
Start
Slave Address
Function
Data (n-1)
.......
Data (0)
CRC
End 1
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 September 2012
A silent interval of more than 10ms
Communication address: 1-byte
Function code: 1-byte
Contents of data: n word = n x 2-byte, n12
Error checking: 1-byte
A silent interval of more than 10ms
A2
ASDA-
9-9