So what is the USB virtual serial port of the barcode scanner?

It is estimated that many small partners do not know it, so I will briefly introduce what is a USB virtual serial port.

The USB virtual serial port belongs to the USB communication device class. At the physical layer, a physical serial port is provided for the host by means of a virtual serial port through the USB bus. Inside the system, the USB controller provides a bulk transfer IN endpoint and a bulk transfer OUT endpoint for receiving and sending data, simulating the RX and TX lines of the serial port.

In addition, the USB controller also provides an interrupt IN endpoint to send the status of the current serial port to realize the control of the serial port transmission. The data of the serial device is collected by the serial port of the system, and the USB package is packaged in the chip, uploaded to the host through the USB bus, and then processed by the corresponding serial port application program.

For users, what they see is data collection and transmission based on serial port, but what is actually realized is data transmission based on USB protocol packets.

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