Currently, the common mouse interface has a serial port, PS / 2, USB three types.

Serial port is the serial interface, that is, COM interface. Is a 9-pin or 25-pin D-type interface, the mouse will be connected to the computer host serial port can be used. The advantage is that the scope of application and the most models, the disadvantage is that the data transfer rate of the serial port communication is too low, the middle and high-end mouse can not play its high-performance advantage, and does not support hot plugging. In the latest BTX motherboard specification has canceled the serial port, with the popularity of the BTX specification, the serial mouse will be gradually eliminated.

The PS/2 interface is currently the most common mouse interface, initially patented by IBM, and commonly referred to as the "small port". This is a special interface for mice and keyboards, a 6-pin circular interface. However, the mouse only uses 4 pins to transmit data and power supply, and the remaining 2 pins are empty.PS/2 interface transmission rate is slightly faster than the COM interface, and is the standard interface for ATX motherboards, which is one of the most widely used mouse interfaces at present, but it still can't make the high-grade mouse to fully play its performance, and it doesn't support hot-plugging. This is also the interface that will soon be phased out in the BTX motherboard specification.

USB is an acronym for Universal Serial Bus, which means "Universal Serial Bus" in Chinese. Its maximum data transfer rate is 12Mbps and 480Mbps, respectively, and it is a high-speed general-purpose interface. This is a new type of mouse interface, compared with the first two interfaces, its advantages are very high data transfer rate, fully able to meet the requirements of a variety of mice in the refresh rate and resolution, to enable a variety of mid-range and high-end mice to fully play its performance, and support for hot swapping.