Today, almost all the computers bought by people are equipped with one or more USB interface on the back. You can connect devices from the mouse to the printer to the computer through the USB interface, which is fast and convenient. In addition, the operating system also supports USB, whose installation is quick and simple. Compared with other device connecting the device to a computer (including parallel interface, serial interface, and a special card that you install inside the computer chassis), the USB device is really extremely simple!
Features of USB
In the past, the printers are connected to the parallel interface and most computers have only one interface. Devices such as Zip drives need to establish high-speed connection with computer, they have to use the parallel interface, but usually a low success rate and the speed is not fast enough. The goal of USB is to end the trouble of headache. The method provided by USB is single, standardized and easy to use, which can connect up to 127 devices to your computer.
How to connect USB device to the computer
It is very simple to connect USB device to the computer - you just find the USB interface on the computer and then insert the USB connector. If it is a new device, the operating system will automatically detect it and look for the driver. If the equipment has been installed, the computer will activate the device and begins to talk to it. After that, you will be able to connect and disconnect USB devices.
Using USB hub to connect many devices to the computer
Today, the majority of computers provide two USB jacks. There are multiple usb port devices currently available on the market, so the jack on the computer will soon be used up. For example, there is USB printer, USB scanner, a USB webcam and a USB network connection in a computer. But this computer has only a USB interface. Obviously, the question now is how these devices are connected to the computer "? The simple way to solve the problem is to buy an inexpensive office depot usb hub. The USB standard supports up to 127 devices and USB hubs are part of the standard. The USB hub typically has four new ports and may be more. You will need to insert the hub into the computer and then insert the device (or other hubs) into the hub. You can establish dozens of USB ports on a computer by chaining USB hubs together.
Notes for selecting USB hubs
Some USB hubs have power but some don't have. The USB standard allows the device to draw power from their USB connection. Obviously, high-power devices such as printers or scanners will be equipped with their own power, low-power devices like mice and digital cameras will rely on being powered by USB in order to simplify its own structure. These electric powers (5 volts up to 500 mA current) are from the computer. If you have a lot of self-powered devices (such as printers and scanners), then you do not need to provide a hub power - because any device connected to the hub no longer need the extra power, so the computers would be sufficient to meet the needs of the USB hub. Conversely, if you have devices like mouse and camera which itself does not provide power, then you may need a powered hub. The USB hub has its own transformer; it will provide power for the USB, so that the device does not increase the burden on the computer power supply.