The use of the barcode scanner USB CDC (USB Communication Device Class) serial port involves serial communication between the barcode scanner and the computer through the USB interface. The following is a clear explanation of the barcode scanner USB CDC serial port:

1. Basic Concepts

USB CDC: USB Communication Device Class is a USB device class used to provide an interface for communication devices (such as modems, network adapters, etc.). In the barcode scanner, USB CDC is used to simulate a virtual serial port (Virtual COM Port), allowing the computer to communicate with the scanning device as if it were communicating with a standard serial port device.

2. Working Principle

Device Connection: The barcode scanner is connected to the USB port of the computer through the USB interface.

Device Identification and Driver Loading: When the scanning device is connected to the computer, it sends a device descriptor so that the computer can recognize that it is a CDC device and load the corresponding driver (which may be required in Windows 7 and below).

Communication Protocol: Once the device is identified and the driver is loaded, the computer and the scanning device can communicate through the USB bus. The communication follows the communication protocol of the USB bus and the communication specification of the CDC device.

3. Data transmission

Data exchange: The scanning device exchanges data with the computer through the USB interface, usually in the form of a virtual serial port.

Data conversion: During the data transmission process, the scanning device converts serial data into USB data packets and sends them to the computer through the USB bus. After the computer receives the USB data packet, it converts it back into serial data and passes it to the application or operating system for processing.

4. Usage

Driver requirements: In Windows 10 systems, USB CDC devices usually work without additional drivers. However, in Windows 7 and below systems, specific drivers may need to be installed.

Data transmission: The data transmitted by the scanning device can be received and viewed through serial port receiving tools (such as serial port assistant, hyperterminal, etc.). By default, the data is usually displayed in hexadecimal format, but it can also be configured to other formats (such as decimal).

5. Notes

Baud rate setting: When using a USB CDC serial port, the baud rate is an important parameter. Generally, it is recommended to set the baud rate to 9600 to ensure the stability and accuracy of data transmission.

Compatibility: Since scanning devices from different manufacturers and models may differ, it is recommended to consult the device's user manual or contact technical support for accurate configuration and usage methods when using the USB CDC serial port. If you are using a barcode scanner produced by our company XTIOT, please contact our sales for more information.

6. Advantages

Flexibility: The USB CDC serial port provides a flexible communication method, allowing developers to use old applications with new products using the same COM port interface as before.

Plug and Play: USB CDC devices usually support plug and play functions, and can be quickly connected to a computer and start working without complex configuration.

The barcode scanner USB CDC serial port provides a convenient and reliable communication method, enabling computers to communicate efficiently with scanning devices in serial.