1) does not enable the function of reading this barcode.

2) Barcode does not conform to the specifications, such as lack of necessary blank areas, low contrast between bar and space, and inappropriate length-width ratio between bar and space.

3) Under direct sunlight, the photosensitive device enters the saturation region.

4) The bar code surface is covered with transparent material, and the reflectivity is too high. Although the eyes can see the bar code, the reader has strict reading conditions and cannot read it.

5) Hardware failure, contact your dealer for maintenance.

Barcode scanner, also known as barcode reader, barcode scanner, barcode scanner, barcode scanner, barcode reader. It is a reading device for reading information contained in bar codes. Using the optical principle, the contents of the bar code are decoded, and then transmitted to the computer or other equipment through the data line or wireless mode. Widely used in supermarkets, logistics express delivery, libraries and other scanning bar codes of goods and documents.

Barcode scanner, also known as barcode scanner/reader, is a device for reading information contained in bar codes, which can be divided into one-dimensional barcode scanner and two-dimensional barcode scanner. The structure of barcode scanner usually consists of the following parts: light source, receiving device, photoelectric conversion part, decoding circuit and computer interface. The basic working principle of the scanning gun is that the light emitted by the light source shines on the bar code symbol through the optical system. The reflected light is imaged on the photoelectric converter through the optical system and interpreted by the decoder as a digital signal that can be directly accepted by the computer. Divided into one-dimensional and two-dimensional barcode scanner classification. It can also be divided into CCD, all-angle laser and laser handheld barcode scanner.