Code 128条码的最大长度 [英] Maximum length of a Code 128 barcode

问题描述

我需要创建一个最大为44个字符的Code 128条形码. Code 128条码格式最多支持多少个字符?

I need to create a Code 128 barcode with a maximum of 44 characters. What is the maximum number of characters supported by the Code 128 barcode format?

我知道Code 128可以对ASCII的所有128个字符进行编码，但是我无法确定它支持的最大字符数.

I came to know that Code 128 can encode all 128 characters of ASCII, but I cannot determine the maximum number of characters it supports.

推荐答案

代码128(ISO/IEC 15417)的规范保留了未定义的最大长度，并指出这是任何派生的应用程序都应定义的内容 ^[*] 标准:

The specification for Code 128 (ISO/IEC 15417) leaves the maximum length undefined and states that this is something that should be defined by any derivative application^[*] standard:

4.7.1符号系统和数据特征

应用程序规范应考虑以下参数.

Application specifications should consider the following parameters.

b)符号中数据字符的数量，该数量可以是固定的， 变量或变量，直到定义的最大值.

b) The number of data characters in the symbol, which may be fixed, variable or variable up to a defined maximum.

例如，GS1通用规范定义GS1-128(代码128在供应链行业中的正式应用)的每个符号限制为48个字符:

For example the GS1 General Specification define that GS1-128 (the formal application of Code 128 to the supply chain industry) has a limits of 48 characters per symbol:

5.4.1 GS1-128条形码符号大小特征:

GS1-128符号体系的特征是:

The characteristics of the GS1-128 Symbology are:

• GS1-128条形码符号尺寸特征:

• GS1-128 Bar Code Symbol size characteristics:

• 单个符号中数据字符的最大数量为48.

实际上，应该将字符数限制为适合扫描仪视野的任何数量.这将取决于设备的类型和型号，例如手持式vs固定式，激光vs CCD，高端vs预算等.在不受控制或开放的环境中，应该对高度公差进行预算.

Practically one should restrict the number of characters to whatever fits comfortably in a scanner's field of view. This will vary depending on the type and model of the device, e.g. handheld vs fixed, laser vs CCD, high-end vs budget, etc. In uncontrolled or open environments a high degree of tolerance should be budgeted for.

尤其值得注意的是，Code 128支持数字数据的双密度压缩(模式C")，这使得对长数字串的编码更加有效.

It is especially worth noting that Code 128 supports double-density compression of numeric data ("mode C") which makes encoding long strings of digits much more efficient.

这里是包含12345678901234567890123456789012345678901234的44位代码128:

Here is a 44-digit Code 128 containing 12345678901234567890123456789012345678901234:

此尺寸适合大多数实际应用.

This is appropriately sized for most practical applications.

但是，这一次是相同的代码128，其中包含44个字母字符ABCDEFGHIJABCDEFGHIJABCDEFGHIJABCDEFGHIJABCD:

However, here is the same Code 128 this time containing 44 alpha characters ABCDEFGHIJABCDEFGHIJABCDEFGHIJABCDEFGHIJABCD:

这种大小的条形码在许多应用中将无用，因为要可靠地读取条形码，将需要具有高分辨率和宽视场的扫描仪.

A barcode of this size will not be useful in as many applications since reading this reliably would require a scanner with a high resolution and wide field-of-view.

因此，最终Code 128的最大长度不仅取决于应用程序的实际限制，而且取决于要编码的数据的类型.

So ultimately the maximum length of a Code 128 is dependant not only on the practical constraints of the application but also the type of data to be encoded.

_{[*]应用程序是行业术语，指的是使用条形码系统的环境和过程，而不是任何特定的软件应用程序.}

_{[*] Application is the industry term referring to the environment and processes in which the barcode system is to be used, rather than any specific software application.}

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