The main characteristics of the USB interface are:

1. Easy to use. Plug and play, hot swappable, with automatic configuration capability. Users can simply plug peripherals into a bus outside of their PC, and the PC can automatically recognize and configure USB devices.

2. Fast speed. On the basis of following the usbI.1 specification, the maximum transmission speed of the USB interface can reach 12MbPs, while in the usBZ.0 specification

Next, it can even reach 48oMbps.

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

4. Capable of using bus power supply. The USB bus provides up to SV voltage and solllA current. Most USB peripherals do not require a separate power supply system.

5. Unified standards. The common ones are hard drives with IDE interfaces, mouse and keyboard with serial ports, and printer scanners with parallel ports. However, with USB, these application peripherals can all be connected to personal computers using the same standard, resulting in USB hard drives, USB mice, USB printers, and so on.

6. Multiple devices can be connected. USB often has multiple interfaces on personal computers, which can connect multiple devices simultaneously. If a USB HUB with four ports is connected, it can be reconnected; Four USB devices, and so on, can be connected as much as possible, connecting all your devices to a personal computer without any problems (note: up to 127 devices can be connected). With the increasing complexity of intelligent instrument control systems and the increase in data collection, it is urgent to seek a faster, safer, and more convenient communication form. The characteristics of the USB interface precisely meet this application requirement, and it will be inevitable for USB products to enter the field of intelligent instruments and industrial control.