Why the barcode scanner cannot recognize the barcode

DeactivatingBarcode ScannerItselfHardware faultsIn addition to the unrecognized bar code, the following situations may also cause the bar code scanner to be unable to recognize the bar code.
 
( 1 )   The recognized barcode is not opened.For some special bar codes, the factory settings of the barcode scanner are disabled by default. To identify this type of bar code, you must first open this type of bar code through the setup manual.
 
( 2 )   The bar code itself does not comply with the specificationsFor example, if a blank area is missing, the contrast between the bar and the blank area is too low, the width and width of the Bar and the blank area are not suitable, or the bar code is blurred and the bar code is incomplete.
 
( 3 )   Strong direct sunlightThe reflected light is also very strong, so that the photosensitive device enters the saturation zone.
 
( 4 )   The scanning distance is too far or too close.Beyond the reading range of the scanning gun (the reading range of the red scanning gun is 2 CM Left and right, the distance between the laser scanner and common bar code should be 6-25 cm   Between)
 
( 5 )Scanning Angle not masteredVertical Scan is incorrect. (Because the bar code surface will reflect the light, the reflection light is directed to the mirror in the scanner window, it will interfere Bar CodeScanner Normal decoding. The correct scanning angle should be the tilt angle between the scanner and the barcode ).