Barcode coding principle in the coding of goods, the following basic principles should be observed: uniqueness uniqueness principle is the basic principle of commodity coding. Refers to the same goods should be assigned the same commodity code, the basic characteristics of the same commodity as the same commodity;
When encoding a commodity, the following basic principles should be observed:
The principle of uniqueness is the basic principle of commodity coding. Refers to the same goods should be assigned the same commodity code, the basic characteristics of the same commodity as the same commodity; The basic characteristics of a different commodity as a different commodity.
Stability principle refers to the commodity identification code once allocated, as long as the basic characteristics of the commodity has not changed, should remain unchanged. The same commodity, whether long-term continuous production or intermittent production, must adopt the same commodity code. Even if the product ceases to be produced, its code should not be used for any other commodity for at least 4 years.
3) No meaning
The principle of no meaning means that every digit in the commodity code does not represent any specific information related to the commodity. Meaningful code often results in loss of encoded capacity. Manufacturers in the preparation of commodity code, it is best to use the flow number without meaning.
For some goods, in the circulation process may need to understand its additional information, such as production date, validity, batch number and quantity, etc., at this time can use the application identifier (AI) to meet additional information labeling requirements. An application identifier consists of 2~4 digits that identify the meaning and format of the data that follows.
Barcode Scanner Principle:
According to custom, different barcode scanners are also called barcode readers, barcode scanners, barcode scanners, barcode scanners and barcode scanners.
The barcode scanner uses the photoelectric principle to transform the bar code information into the computer acceptable information input equipment, commonly used in libraries, hospitals, bookstores and supermarkets, as a quick registration or settlement of an input means, the goods on the packaging or printed on the bar code information directly read, and entered into the online system.
1, barcode scanner is used to read the bar code contains information equipment, barcode scanner structure is usually the following parts: light source, receiving device, photoelectric conversion components, decoding circuit, computer interface.
2. The basic working principle of barcode scanner is:
The light emitted by the light source shines through the optical system to the barcode symbol, the light reflected back through the optical system imaging in the photoelectric converter, so that the signal generated by the circuit after the amplification of analog voltage, which is reflected on the barcode symbol on the back of the light is directly proportional to, and then filtered, plastic, A square wave signal corresponding to the analog signal is formed, which is interpreted by a decoder as a digital signal which can be directly accepted by the computer.
3, ordinary barcode scanners usually use the following three kinds of technology: light pen, CCD, Laser
They all have their pros and cons, and none of the scanners can have an advantage in all respects.