Adleepower AP2G3-337 Instruction Manual page 58

B. Communication protocol
Data contents are in hexadecimal with postive and negative format.
1. RTU
Start
Address
Function
Data (n-1)
...
Data 0
CRC CHK Low
CRC CHK High
End
2. ASCII
STX
Address Hi
Address Lo
Function Hi
Function Lo
Data (n-1)
...
Data 0
LRC CHK High
LRC CHK Low
END Hi
END Lo
A silent interval of more than 10ms
8-bit address
8-bit command
Contents of data :
≦
n*8-bit data, n 16
Check sum (CRCL)
Check sum (CRCH)
A silent interval of more than 10ms
Start character=' : ' (3AH)
Communication address :
8-bit address consists of 2 ASCII codes.
Command code :
8-bit command consists of 2 ASCII codes.
Contents of data :
n*8-bit data consist of 2n ASCII codes.
LRC check sum :
8-bit check sum consists of 2 ASCII codes.
End characters :
END Hi=CR(0DH)
END Lo=LF(0AH)
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