Long-range control technology of computer, start at DOS era, with the high development of the network, the management of the computer and need of technical support, operate long-rangly and the control technology arouse the attention from people more and more. Control and generally support these following network ways long-rangly : LAN , WAN , dial mode , Internet way. Top management end Remote go, control, accuse of end Host , accuse of end Host bonded to peripheral hardware also remotely, finish the acquisition of the outside data, and then finishes a series of control operation commercially. But general CPU can't be mutual with the peripheral hardware directly, they need interface as bridge , I/O interface finish CPU as intermediary and peripheral hardware information mutual. This text is from the classification in the interface , several respects such as the structure of the interface , the function of the interface , the agreement of the interface make an introduction, having analyzed one bunch of mouths that we know very well most emphatically, and the mouth of mouth and USB. Bunches of mouthfuls of communication little circuit of transmitting spent, suitable for remote communication; And the mouth is transmitted fast, high in efficiency, but only suitable for the communication of short distance; USB mouth introduces some technology of the network on the basis of traditional computer institutional framework , in order to become the mainstream of interface of new computer. Use VC 6.0 visual software programming platform, finish double machine communication of one bunch of mouths , and the procedure of printing of the mouth, USB mouth and driver one is mutual.
Key Words: Serial port; Paralell port; Universal serial bus
