ASDA-B3 MODBUS Communication
9-5
9
Communication data structure
Definitions for the data frames in the two modes are as follows:
ASCII mode:
Start
Start character ‘:’ (3AH)
Slave Address
Communication address: 1 byte consists of 2 ASCII codes
Function
Function code: 1 byte consists of 2 ASCII codes
Data (n-1)
Data content: n word = 2n-byte consists of 4n ASCII codes, n ≤ 10
…….
Data (0)
LRC
Error check: 1 byte consists of 2 ASCII codes
End 1
End code 1: (0DH) (CR)
End 0
End code 0: (0AH) (LF)
RTU mode:
Start
A silent interval of more than 10 ms
Slave Address
Communication address: 1 byte
Function
Function code: 1 byte
Data (n-1)
Data content: n-word = 2n-byte, n ≤ 10
…….
Data (0)
CRC
Error check: 1 byte
End 1
A silent interval of more than 10 ms
Содержание ASDA-B3 Series
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