Delta Electronics DELTA DUP-B - Manual (Page 378)

Chapter 3 Creating and Editing Screens
Remark
 The calculation result can be stored as unsigned WORD.
 Var1 and Var2 can be internal memory only. Var3 can be internal memory or
constant.
Example
The starting address is for calculation $0, the data length is set to 2. After the
communication, the calculated checksum through addition calculation is stored in
$2 (this is an operation of unsigned 16-bit data).
 XORSUM (Use XOR to Calculate Checksum)
Equation
Var1 = XORSUM (Var2, Var3)
Explanation
This command uses XOR to calculate checksum. Var1 is the value after calculation,
Var2 is the starting address for calculation and Var3 is data length.
Remark
 The calculation result can be stored as unsigned WORD.
 Var1 and Var2 can be internal memory only. Var3 can be internal memory or
constant.
Example
The starting address is for calculation $0, the data length is set to 2. After the
communication, the calculated checksum through XOR calculation is stored in $2
(this is an operation of unsigned 16-bit data).
Revision May, 2010 3-357