For a simple example, just like two roads, the serial port is one lane and the parallel port is eight lanes, but the transmission speed of the serial port is faster than that of the parallel port. This is because the transmission of parallel port requires eight data to be transmitted in parallel, and none of them can be transmitted, only one serial port can be transmitted. It's like waiting for eight cars to start at the same time at an eight-lane parallel entrance, and one car is not enough. Moreover, in the process of starting, which car is punished by the system to restart, the other seven cars will be implicated in restarting together, so the efficiency is low. As for the serial port, as long as there is a car coming, you can drive away without waiting, and if there is a car error, it is determined by the system to start again, and the vehicles (data) behind it are not affected and you can move on. In the past, hard disks, printer sockets and old sound cards were all parallel ports, and now they are gradually developing to serial ports.

1. Connect the ID card reader to the computer through the connecting cable. 2. Install ID card reader and driver. Please open the card reader and show the card. Just put your ID card on the card reader.

How to install the ID card reader 1 Connecting the ID card reader to the computer will pop up a wizard to find new hardware settings. Select Yes, this time only, and then click Next. 2. Select "Install from a list or a specified location" in the installation interface, and then click "Next". 3. Select "Don't search, I want to choose the installed program myself" in the installation search interface, and then click Next. 4. In the hardware type interface, directly select Default and click Next. 5. Click "Have Disk" in the driver interface. 6. Click Browse in the pop-up interface, and then find the ID driver. 7. Click "Yes" in the security warning interface. 8. Click the "Finish" button in the wizard interface to complete the installation.