AML M3000 Guia do Utilizador descarregar pdf (Página 135)

M3000 Portable Bar Code Reader User's Guide

A - 4

1. Each data character is assigned a numerical value as shown in the following table:

CHAR VALUE CHAR VALUE CHAR VALUE

0 0 F 15 U 30

1 1 G 16 V 31

2 2 H 17 W 32

3 3 I 18 X 33

4 4 J 19 Y 34

5 5 K 20 Z 35

6 6 L 21 - 36

7 7 M 22 . 37

8 8 N 23 SPACE 38

9 9 O 24 $ 39

A 10 P 25 / 40

B 11 Q 26 + 41

C 12 R 27 % 42

D 13 S 28

E 14 T 29

2. Sum all of the numerical values for each data character in the bar code.

3. Divide this sum by 43.

4. The remainder is the numerical value for the check digit. Use the table in step 1 to look-

up the corresponding character.

EXAMPLE: Sample Code 39 data = A394T

1. Use the table to lookup the numerical value for each character.

2. 10 + 3 + 9 + 4 + 29 = 55

3. 55 / 43 = 1 remainder 12

4. Check digit numerical value = 12

The check digit = C.

Bar code with check digit = A394TC

1 2 ... 130 131 132 133 134 135 136 137 138 139 140 ... 155 156

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AML M3000 Guia do Utilizador Página 135