upc编码(cpu的缩写)

01.UPC码的简介和特性

通用产品代码，通常简称UPC码，是美国均匀码理事会制定的一种商品条码。是最早大规模应用的条码，其特性是一种长度固定、连续性的条码，主要在美国和加拿大使用，由于其应用范围广泛，故又被称万用条码。 UPC码仅可用来表示数字，故其字码即为数字0~9。

UPC码共有A、B、C、D、E等五种版本。

UPC码只能用来表示0-9的数字。每7个模组表达一个字符，每个模组有空（白色）与条（黑色）两种状态。

02.应用场景

1、UPC-A

通用商品

2、UPC-B

医药卫生

3、UPC-C

产业部门

4、UPC-D

仓库批发

5、UPC-E

商品短码

UPC条码也有标准版和缩短版两种，标准版由12位数字构成，缩短版由8位数字构成。

标准版的UPC12的编码结构为：系统码(1位)+厂商码(5位)+商品码(5位)+校检码(1位)。

03.编码方式

UPC-A码

用于通用商品，是适用范围最广的一种UPC码。一共有113个模组，每个模组长0.33毫米。左右两个各由9个模组组成的空白。

UPC-A码是定长码，只能表示12位数字。

从左至右，依次是3个模组（101）的起始码、1位的系统码、5位的左侧数据码、5个模组（01010）的中间码、5位的右侧数据码、检查码、3个模组（101）的终止码。

其中，起始码、中间码、终止码的模组长度都要长于数据码。

UPC-B\C\D码

与UPC-A码基本相同。

其中：B码主要用于医药卫生；C码用于产业部门，第二位为系统码，倒数第二位为检查码；D码用于仓库批发，倒数第三位为检查码。

UPC-E码

短码，总长度为8个字码。A码与E码之间数字的对应规则与最后一位检查码有关。

E表示偶码，O表示奇码。UPC-E的奇码与UPC-A的奇码完全相同。

04.举例

从国别码开始自左至右取数，设UPC-A各码代号如下:

N1 N2 N3 N4 N5 N6 N7 N8 N9 N10 N11 C

则检查码之计算步骤如下:

C1 =( N1+ N3+N5+N7+N9+N11)*3 C2 = N2+N4+N6+N8+N10

CC = (C1+C2) 取个位数 C (检查码) = 10 - CC (若值为10，则取0)

翻译成英文：

Introduction to UPC Code

01. Introduction and characteristics of UPC code

Universal product code, usually referred to as UPC code, is a commodity bar code formulated by the U.S. Uniform Code Council.

It is the first barcode to be used on a large scale.

Its characteristic is a fixed-length, continuous barcode. It is mainly used in the United States and Canada. Because of its wide range of applications, it is also called a universal barcode.

UPC code can only be used to represent numbers, so its character code set is numbers 0~9.

There are five versions of UPC code: A, B, C, D, and E.

UPC codes can only be used to represent numbers from 0-9. Every 7 modules express a character, and each module has two states: empty (white) and bar (black).

02. Application scenarios

1. UPC-A

General merchandise

2. UPC-B

Medicine & Health

3. UPC-C

Industry sector

4. UPC-D

Warehouse wholesale

5. UPC-E

Product short code

UPC barcodes are also available in standard and shortened versions. The standard version consists of 12 digits and the shortened version consists of 8 digits.

The coding structure of the standard version of UPC12 is: system code (1 digit) + manufacturer code (5 digits) + product code (5 digits) + verification code (1 digit).

03. Coding method

UPC-A code

It is the most widely applicable UPC code for general commodities. There are a total of 113 modules, each of which is 0.33 mm long. The two left and right blanks each consist of 9 modules.

The UPC-A code is a fixed-length code, which can only represent 12 digits.

From left to right, it is the start code of 3 modules (101), the system code of 1 bit, the data code of 5 digits on the left, the middle code of 5 modules (01010), and the data of 5 digits on the right. Code, check code, termination code of 3 modules (101).

Among them, the module length of the start code, intermediate code, and stop code must be longer than the data code.

UPC-B\C\D code

It is basically the same as the UPC-A code.

Among them: B code is mainly used for medicine and health;

C code is used for industrial departments, the second digit is the system code, and the penultimate digit is the check code;

the D code is used for warehouse wholesale, and the third digit is the check code.

UPC-E code

Short code, the total length is 8 characters. The corresponding rule of the number between the A code and the E code is related to the last check code.

E means even code, O means odd code. The odd code of UPC-E is exactly the same as the odd code of UPC-A.

04. Example

Counting from left to right starting from the country code, suppose the codes of UPC-A are as follows:

N1 N2 N3 N4 N5 N6 N7 N8 N9 N10 N11 C

The calculation steps of the check code are as follows:

C1 =( N1+ N3+N5+N7+N9+N11)*3 C2 = N2+N4+N6+N8+N10

CC = (C1+C2) take the single digit C (check code) = 10-CC (if the value is 10, take 0)

部分参考资料来源于百度，英语来源于Google翻译。

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