I-7021/22/24, M-7022/24/28 User Manual, Rev: B2.3
49
Checksum Calculation:
1.
Calculate the ASCII code sum of all the characters in
the command/response string except for the carriage
return character (CR).
2.
The checksum is equal to the sum masked by 0FFh.
Example:
Command string: $012(CR)
1.
Sum of the string = “$”+”0”+”1”+”2” =
24h+30h+31h+32h = B7h
2.
Therefore the checksum is B7h, and so
CHKSUM = “B7”
3.
The command string with the checksum = $012B7(CR)
Response string: !01200600(CR)
1.
Sum of the string =
“!”+”0”+”1”+”2”+”0”+”0”+”6”+”0”+”0” =
21h+30h+31h+32h+30h+30h+36h+30h+30h = 1AAh
2.
Therefore the checksum is AAh, and so
CHKSUM = “AA”
3.
The response string with the checksum
= !01200600AA(CR)
Note:
All characters should be in upper case.
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