Delta AH500 - Page 580

AH500 Programming Manual
6-412
STX
‘：’ The start-of-text character is ‘：’ (16#3A).
Address Hi
‘ 0 ’
Communication address:
The 8-bit address is composed of two ASCII codes.
Address Lo
‘ 1 ’
Function Hi
‘ 0 ’
Function code:
The 8-bit function code is composed of two ASCII codes.
Function Lo
‘ 3 ’
DATA (n-1)
…….
DATA 0
‘ 2 ’
Data: The n×8-bit data is composed of 2n ASCII codes.
‘ 1 ’
‘ 0 ’
‘ 2 ’
‘ 0 ’
‘ 0 ’
‘ 0 ’
‘ 2 ’
LRC CHK Hi
‘ D ’
LRC check code:
The 8-bit check code is composed of two ASCII codes.
LRC CHK Lo
‘ 7 ’
END Hi
CR
End-of-text character:
END Hi=CR（16#0D）， END Lo=LF（16#0A）
END Lo
LF
2. LRC check code: The values starting from the communication address to the data are added
up. The two’s complement of the sum gotten is the LRC check code.
Example:
16#01+16#03+16#21+16#02+16#00+16#02=16#29
The two’s complement of 16#29 is 16#D7.