条码技术适用于任何场合吗(39码的简介)

Posted 2023-05-29

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条码技术适用于任何场合吗(39码的简介)

★ 目录 ★

01 39码的简介和特性

02 应用场景

03 编码方式

04 举例

01. 39码的简介和特性

(1)39码简介

1973年美国统一编码协会（简称UCC）建立了UPC条形码系统，实现了该码制标准化。同年，食品杂货业把UPC码作为该行业的通用标准码制，为条形码技术在商业流通销售领域里的广泛应用，起到了积极的推动作用。

39码是第一个字母、数字式相结合的条形码,是一种可表示数字、字母等信息的条码。

(2)39码特性

条码的长度没有限制，可随着需求作弹性调整。但在规划长度的大小时，应考虑条码阅读机所能允许的范围，避免扫瞄时无法读取完整的资料。

起始码和终止码必须固定为“ * ”字元。允许条码扫瞄器进行双向的扫瞄处理。

由于39码具有自我检查能力，故检查码可有可无，不一定要设定。

条码占用的空间较大。

02 .应用场景

39码是国内常见的条形码之一，39码是在1974年发展出来的条形码系统。

39码之所以在国内常见的原因有两个。

一个是因为三九码的限制很少，而且支持文数字；

另一个则是它很适用在非正式场合中。

1974年Inte rmec公司的戴维·阿利（Davide·Allair)博士研制出39码，很快被美国国防部所采纳，作为军用条码码制。

现如今主要用于工业、图书及票证的自动化管理以及各种标签，如名牌，库存快递单等等。

03.编码方式

编码规则

1、每五条线表示一个字符；

2、粗线表示１，细线表示０；

3、线条间的间隙宽的表示１，窄的表示０；

4、五条线加上它们之间的四条间隙就是九位二进制编码，而且这九位中必定有三位是1，所以称为39码；

5、条形码的首尾各一个＊标识开始和结束；

6、宽条和窄条的比率为2-3之间；

39码校验位的计算规则

39码用的是Mod 43 校验计算法。

步骤

1、将所有的字符转换为相应的数值并相加。

2、将步骤1的结果除以43，取其余数。

3、校验位是步骤2余数对应的字符。

04.举例

示范字符串为 :12345ABCDE/

1 将所有的字符转换为相应的数值并相加。例如：1 +2 + 3 + 4 + 5 + 10 + 11 + 12 + 13 +14 + 40 = 115

2 将步骤1的结果除以43，取其余数。例如：115 / 43 = 2 余29

3 校验位是步骤2余数对应的字符。余数 = 29，29 所对应的字符是 T，T 即是校验位。

翻译成英文：

Introduction to Code 39

table of Contents

01 Introduction and characteristics of code 39

02 Application scenarios

03 Coding method

04 Example

01. Introduction and characteristics of code 39

(1) Introduction to code 39

In 1973, the United States Uniform Code Association (UCC) established the UPC bar code system and realized the standardization of the code system. In the same year, the grocery industry adopted the UPC code as the industry's universal standard code system, which played a positive role in promoting the wide application of barcode technology in the field of commercial circulation and sales.

Code 39 is the first bar code that combines letters and numbers. It is a bar code that can express numbers, letters and other information.

(2) 39 code features

There is no limit to the length of the barcode, and it can be adjusted flexibly according to demand. However, when planning the size of the length, the allowable range of the barcode reader should be considered to avoid the inability to read the complete data during scanning.

The start code and stop code must be fixed as "*" characters. Allow the barcode scanner to perform two-way scanning processing.

Since the 39 code has the ability to self-check, the check code is optional and does not have to be set.

The bar code takes up a lot of space.

02. Application scenarios

Code 39 is one of the common barcodes in China. Code 39 is a barcode system developed in 1974.

There are two reasons why code 39 is common in China.

One is because there are few restrictions on the three-nine code, and it supports alphanumeric characters;

The other is that it is very suitable for informal occasions.

In 1974, Dr. Davide Allair of Inte rmec developed the 39 code, which was quickly adopted by the US Department of Defense as a military barcode code system.

Nowadays, it is mainly used for the automated management of industry, books and tickets, as well as various labels, such as brand names, inventory express orders, and so on.

03. Coding method

encoding rules

1. Every five lines represent a character; • •

2. The thick line represents 1, and the thin line represents 0; • •3. The width of the gap between the lines represents 1, and the narrow represents 0;

4. The five lines plus the four gaps between them are nine-bit binary codes, and three of these nine bits must be 1, so it is called the 39 code;

5. One at the beginning and the end of the bar code * mark the beginning and the end;

6. The ratio of wide strips to narrow strips is between 2-3;

The calculation rule of 39 code check digit

Code 39 uses Mod 43 check calculation method.

Each character of code 39 has a designated value, as shown in the following table.

step

1. Convert all characters into corresponding numerical values and add them.

2. Divide the result of step 1 by 43 and take the remainder.

3. The check digit is the character corresponding to the remainder of step 2.

04. Example

The example string is: 12345ABCDE/

1 Convert all characters into corresponding numerical values and add them. For example: 1 + 2 + 3 + 4 + 5 + 10 + 11 + 12 + 13 +14 + 40 = 115

2 Divide the result of step 1 by 43 and take the remainder. For example: 115/43 = 2 remaining 29

3 The check digit is the character corresponding to the remainder of step 2. The remainder = 29, the character corresponding to 29 is T, and T is the check digit.

部分参考资料来源于百度，英语来源于Google翻译。

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