The computer transmits the data scanned by the QR code scanning device mainly depends on the connection method between the QR code scanning device and the computer. Here are some common connection methods and their data transfer methods:

USB interface connection: Most barcode scanning devices are equipped with a USB interface, which can be directly connected to the computer through a USB cable. When the USB interface is plugged into the computer's USB port, the computer will automatically recognize and install the corresponding driver. After the connection is successful, the data scanned by the QR code scanning device can be directly transferred to the computer.

Wireless connection: Some barcode scanning devices support wireless connection, such as connecting to a computer via Bluetooth or Wi-Fi. In this case, you first need to make sure that your computer's Bluetooth or Wi-Fi function is turned on. Then press the pairing button on the scanning device to put it into pairing mode. Search for available Bluetooth or Wi-Fi devices on your computer and select the device to scan the QR code for pairing. After successful pairing, wireless communication can be carried out between the QR code scanning device and the computer, and the data scanned by the QR code scanning device will also be transmitted to the computer in real time.

PS/2 interface connection: Some older barcode scanning devices may be equipped with a PS/2 interface, and you need to connect it to the computer through a PS/2 cable. Plug the PS/2 connector into the computer's PS/2 port and then restart the computer. The computer will automatically identify and install the appropriate driver. After the connection is successful, the data transmission method of the QR code scanning device is similar to the USB interface connection.

During the data transmission process, you may need to open specific software (such as Excel or other purchase, sales and inventory software) on your computer in order to receive and process the data transmitted from the QR code scanning device. For example, in Excel, you can click on the target cell where you need to enter the barcode, then scan the barcode, and the data will be automatically populated into the cell.

Please note that although scanning devices can scan and transmit barcode data, these data are usually just a string of numbers representing information about the barcoded product (such as product name, price, etc.). This specific information needs to be parsed and displayed through other software or systems (such as databases, ERP systems, etc.).

In addition, different scanning devices and computer systems may have different setup and configuration requirements, so in actual operation, you may need to refer to the specific instructions or manuals of the scanning device and computer to ensure correct connection and data transmission.