The following table lists some characteristics of the nine bar code symbologies decoded by the Quick Check 600/800 Verifier.

 

 

Element

Symbology

Character Set

widths

 

 

 

UPC

numeric

4 widths

EAN

numeric

4 widths

Codabar/USS Codabar

numeric with 6 special char-

2 widths

 

acters

 

Code 39

alphanumeric, 26 uppercase

2 widths

 

letters, 10 digits, 7 special

 

 

characters

 

Code 11

numeric and ---

3 widths

Interleaved 2 of 5

numeric

2 widths

Code 16K

alphanumeric with all func-

2 widths

 

tion codes and special char-

 

 

acters (full ASCII set)

 

Code 128

alphanumeric with all func-

4 widths

 

tion codes and special char-

 

 

acters (full ASCII set)

 

Code 49

alphanumeric (all 128 ASCI

6 widths

 

characters)

(stacked symbol-

 

 

ogy)

Code 93

alphanumeric (all 128 ASCI

4 widths

 

characters)

 

MSI Code

numeric

4 widths

How a Bar Code Verifier Works

A bar code reader or scanner extracts the information that is optically encoded in a bar code symbol and converts it into computer-compatible digital data.

Hand Held Products provides a variety of handheld wand or pen scanners with the verifier that are designed to minimize scratching the symbol. When you place the wand on a bar code symbol and move it across the symbol, electro-optical techniques read the symbol. All wands contain a light emitting diode (either visible or infrared light) which illuminates the symbol.

The area of the symbol that is actually being scanned at any given time is referred to as the “spot” and is defined by an aperture. The spot size varies depending on which wand is used. The spot is formed by flooding the symbol with light. A tightly focused aperture collects the light. The light reflected from the spot is directed to a photodiode detector which generates a small current

6 - 6

Quick Check® 600/800 Series User’s Guide

Page 80
Image 80
Hand Held Products 600, 800 manual How a Bar Code Verifier Works, Element, Symbology Character Set Widths