Code 128 barcode details

CODE 128 By Computer Identics Corporation（ The United States ） stay 1981 Developed in .CODE 128 Bar codes can represent all 128 individual ASCII Code character （ Numbers 、 Large letters 、 A lowercase letter 、 Symbols and controls ）. Because it can represent all the characters on the computer keyboard （ Except for Japanese Kanji 、 Hiragana 、 Katakana ）, Therefore, it is a bar code that can be easily applied on the computer .

CODE 128 The basic composition of bar code ：

The barcode size has 4 Kind of .

use 3 A bar and 3 Empty （ There are six units ） Represents a character .

There are three kinds of initializers ,"CODE-A"、"CODE-B" and "CODE-C". The type of the start character determines the composition of the following characters .

When CODE-C when , Use a bar pattern to represent 2 Digit number . This requires very high data density .

When using code to set characters （CODE-A、CODE-B and CODE-C）, Start with CODE-A The bar code of can be changed to adopt in the processing of bar code CODE-B or CODE-C Column characters .

When "SHIFT" when , Only close to SHIFT One character of can be changed in the next column （A To B,B To C,C To A）.（ And on the computer keyboard SHIFT Key operation is similar to ）

" modular 103" Used as check digit .

CODE 128 Characteristics of ：

CODE 128 The barcode contains all 128 individual ASCII Code character （ Including things like [ESC]、 [STX]、 [ETX]、 [CR] and [LF] The controller of ）.

When the start character is CODE-C when , A bar pattern can represent 2 Digit number . This makes the constitution of bar code very effective . If the barcode data has 12 Bit or more , Same as ITF comparison ,CODE 128 smaller .

because CODE 128 There are four sizes of the bar , Therefore, the printing quality of the printer is required to be very high .CODE 128 Not suitable for dot matrix printer and FA Ink jet printer , It is also not suitable to use rubber relief to print on the box board paper packaging box .

If you just deal with numbers ,CODE 128 use CODE-C As a starting character , Bar codes have a high data density .EAN-128 Adopted CODE 128 Characteristics of , At present, it is used in many industrial fields . use EAN-128 , Different data can be included in the barcode , Such as the production date of the product 、 The period of validity 、 weight 、 size 、 Batch number 、 Destination 、 Customer current account, etc .