Plug the crystal head of the data cable into the bottom port of the scanner, note that if you can pull it out directly after plugging it in, it means that it is not plugged in well, because you can't pull it out directly after plugging it in.
The scanner is a machine that reads barcode information. It utilizes an infrared light source that is emitted, and then based on the reflected results, a chip is used to decode the code, and then finally return the correct characters represented by the barcode. The bar code is a combination of black and white lines, and the bar code scanner is with the help of black and white on the infrared reflection degree of difference to determine the width of the bar code. Barcode scanner has a sensor inside, will be based on the intensity of the reflected light and produce different high and low voltage, which in turn produces logical data, barcode scanner received logical signals, can be based on the coding rules, to produce digital data, through the scanning of different voltages, according to the coding rules to produce digital data, the code scanner, a digital conversion of the work of the device. Through the scanning of the data will be transmitted to the computer for storage, inventory called inventory machine or data collector, which itself is a computer, the principle is the same as your cell phone, are CPU, memory, FLASH, you can also insert the memory card.