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For the bar code scanner, the bar code is generally not scanned. In addition to the difficulty of reading the bar code caused by the hardware problem of the bar code scanner itself, it may also be caused by factors such as the scanning environment or the scanning angle, so Everyone knows clearly, I have specially summarized the following common reasons why barcode scanners can't read barcodes for your reference.
1) The scanned barcode is not opened. Some special scanning barcodes, the barcode scanner's factory default setting is off, so it is necessary to scan the barcode of this type. At least the first step is to open the barcode type through the setup manual.
2) The bar code itself does not meet the standard. For example, the necessary blank area is lacking, the contrast between the bar and the space is too low, the width ratio of the bar and the space is not suitable, or the bar code is unclear, the bar code is missing, and the like.
3) Intense direct sunlight, the reflected light will also be strong, so that the photosensitive device enters the saturation zone.
4) The scanning distance is too far or too close, beyond the readable range of the scanner (the reading range of the red scanner is about 2CM, and the distance between the laser scanner and the barcode should be between 6-25CM).
5) The scanning angle is not controlled, and the vertical scanning is wrong. (Because the bar code will reflect outside, the reflected light will illuminate the mirror inside the scanner window, which will interfere with the normal decoding of the bar code scanner. The correct scanning angle should be that the scanner and the bar code are inclined). Of course, the above reasons are only suitable for most users to check the cause of their own, so that they can find the root cause of the problem and solve it.
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