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Clearing a Check Digit Scheme
You can clear a check digit scheme from printer memory.
1. In the check digit record created on earlier, replace the A
in box A3 with a C.
2. Follow the instructions in Chapter 6, "Entering Data
Streams," to create a file on your computer.
3. Type the values from the Check Digit Record in the file.
Make sure you have a C in item 3.
4. Save the file.
5. Set the print mode on the printer to "Ready" (see Chapter
7, "Configuring The Printer").
6. Download the file to the printer (see Chapter 8, "Printing").
Sample Check Digit Calculation
There are two types of check digit calculations.
Sum of Products used for bar codes such as UPC-A,
EAN-8, and EAN-13.
Sum of Digits an alternative to Sum of Products.
Sum of Products
1. Place numeric data in a field. Leave the check digit slot
empty.
43827C
2. Starting with the
last
digit before the check digit, assign
weights
, working right to left. Weights are a sequence of
numbers the same length as the field. Digits in the field
are multiplied by the weight digits to determine addends
for the check digit calculation.
Using Check Digits
4. Using Check Digits
4-5