When encoding the product barcode coding principle, the following basic principles should be abide by the following: only the principles of sexuality and sexuality are the basic principles of product coding. It means that the same product should be assigned the same product code, and the products with the same basic characteristics are deemed to be the same commodity; different products must not be allocated.

When encoding the goods, the following basic principles should be obeyed:

1) Uniqueness

Only the principle of sexuality is the basic principle of commodity coding. It means that the same product should allocate the same product code. The products with the same basic characteristics are deemed to be the same commodity. Different products must allocate different commodity codes. Basic characteristics of different products are deemed to be different products.

2) Stability

The principle of stability means that once the product logo code is allocated, as long as the basic characteristics of the product have not changed, it should remain unchanged. Whether the same product is long -term continuous production or intermittent production, the same product code must be adopted. Even if the product stops production, its code should not be used for other products within at least 4 years.

3) No implication

The principle of meaninglessness refers to each digit in the product code that does not represent any specific information related to the product. Meaning code usually leads to losses in coding capacity. When preparing the product code, manufacturers are best to use the uninterrupted flowing number.

For some products, it is necessary to understand its additional information during circulation, such as production date, validity period, batch number, and quantity. At this time, application identifier (AI) can be used to meet the labeling requirements of additional information. The application identifier consists of 2 to 4 digits, which is used to identify the meaning and format of the subsequent data.

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