Delta AH500 Programming Manual page 580

AH 5 00 Pr ogr am m ing Ma n ua l
STX
Address Hi
Address Lo
Function Hi
Function Lo
DATA (n-1)
.......
DATA 0
LRC CHK Hi
LRC CHK Lo
END Hi
END Lo
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.
6 - 4 1 2
'：' The start-of-text character is '：' (16#3A).
' 0 ' Communication address:
The 8-bit address is composed of two ASCII codes.
' 1 '
' 0 ' Function code:
The 8-bit function code is composed of two ASCII codes.
' 3 '
' 2 '
' 1 '
' 0 '
' 2 '
Data: The n×8-bit data is composed of 2n ASCII codes.
' 0 '
' 0 '
' 0 '
' 2 '
' D ' LRC check code:
The 8-bit check code is composed of two ASCII codes.
' 7 '
CR End-of-text character:
END Hi=CR（16#0D） ，END Lo=LF（16#0A）
LF