Barcode scanners can be connected to computers for use in supermarkets, clothing stores, restaurants, bookstores, etc. Scanners generally have three interfaces, namely USB interface, keyboard port and serial port, as shown below.
How to connect barcode scanners and computers:
1) USB interface: generally plug and play, one connected to the scanner, one end connected to the USB port on the computer
2) Keyboard interface: Y-type cable: one end is connected to the computer keyboard port, one end is connected to the keyboard;
3) Serial port: one end is connected to the serial port of the computer, and one end is connected to the scanner.) Note: The serial port generally needs an external power supply, and the keyboard port and USB port can provide 5V power.
The above is the connection between the supermarket barcode gun and the computer. Some friends may not have used the cash register special software such as the invoicing software, so it may be mistaken that as long as the scanner scans the barcode, the price of the product can appear in the computer. Related text information, in fact, this understanding is wrong, the barcode scanner scans only a string of numbers, which is the relevant information (product name, price, etc.) representing the barcode product, but the specific information needs to pass other software. Can be displayed on the computer.
For example, we usually go to the supermarket to shop. We often see that every time the cashier scans a bar code, the name and price of the product will be automatically extracted from the computer. In fact, the computer has already applied such information. Similar to cash register software. The software already contains the text information such as the name and price of all the goods in the supermarket. When the cashier scans the product, the software will automatically match the scanned barcode number with the product information in the database. The name, price, etc. of the product are displayed in text form.
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