Main features of the USB interface

① Easy to use. Plug and play, hot-swappable, and with automatic configuration capabilities, users only need to simply plug the peripheral into the bus outside the PC, and the PC will automatically recognize and configure the USB device.

② Fast speed. Based on the usB I.1 specification, the maximum transmission speed of the USB interface can reach 12 Mbps, and under the usB Z.0 specification
, it can reach 480 Mbps [,].

③ Flexible connection and easy expansion. It can not only connect 127 USB devices, but also has a very flexible connection method. You can use serial connection or use a hub to connect multiple devices together and then connect them to the USB interface of the PC.

④ Bus power supply is possible. The USB bus provides a maximum voltage of SV and a current of 10A. Most USB peripherals do not require a separate power supply system.
Due to the many characteristics of USB, it has replaced most traditional interfaces in PC peripherals. However, RS-232C interfaces are still widely used in intelligent instruments and meters. With the increasing complexity of intelligent instrument control systems and the increase in data collection, there is an urgent need to seek a faster, safer and more convenient communication form. The characteristics of the USB interface just meet this application requirement, and it is inevitable that USB products will enter the field of intelligent instruments and meters and industrial control.