SICK CLV490 Instrucciones de operaciones descargar pdf (Pagina 177)

Operating Instructions Chapter 10

CLV 490 Bar Code Scanner

8 008 796/0000/25-06-2002

10-55

Appendix

10.9 Tables

10.9.1 Calculating the code length of a bar code

The code length of a bar code is the number of useful characters in the printed code

including the check digit (if present). This code length must be specified in CLV-Setup.

If the code type of a bar code is known, the code length can be calculated by counting the

bars and gaps. The relevant formulas are provided in

Table 10-8.

1. Count the bars and gaps as specified in

Table 10-8.

Do not forget to include the start and stop characters.

2. Calculate the code length using the formula in the table.

3. Enter the value in CLV-Setup as described in column 4 in the table.

Code type Count

Calculation of code length

1)2)

Entry in CLV-Setup

Code 39 Number of bars Number – 10

Code

= —————————

Calculated code length

2/5 Interleaved Number of wide ele-

ments (bars and gaps)

Number – 1

Code

= —————————

Calculated code length

EAN Not applicable 13 characters (normal version)

8 characters (short version)

Activate 13-digit

Activate 8-digit

UPC Not applicable 12 characters (UPC A, normal version)

6 characters (UPC E, short version)

Activate Version A

Activate version E

Codabar Number of bars Number – 8

Code

= —————————

Calculated code length

Code 128

(character set A)

Number of bars Number – 10

Code

= —————————

Calculated code length

Code 93 Number of bars plus

separator after the

stop character

Number – 13

Code

= —————————

Calculated code length

EAN 128 Number of bars Number – 10

Code

= —————————

Calculated code length

1) Check digit optional for Code 39, 2/5 Interleaved, Codabar.

Check digit always integrated in printed bar code with EAN, UPC, Code 128, Code 93, EAN 128

(suppressed automatically when the CLV read result is output)

2) With only few exceptions each printed character that has to be decoded corresponds to an ASCII character.

With Code 39 extended, Code 93, Code 128 and EAN 128, the number of characters in the data string of the CLV

can be larger than the number of characters in the printed code because it comprises several character sets.

Table 10-8: Formulas for calculating the code length of a bar code

1 2 ... 172 173 174 175 176 177 178 179 180 181 182 ... 213 214

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