一、接口的定义和分类接口的广义定义是指计算机系统中两个部件相互连接的控制逻辑,如CPU与存贮器之间的连接称作存贮器接口;CPU和I/O设备之间的连接称作输入输出接口;微机与微机之间的连接称作微机连接接口。本讲着重介绍输入输出(I/O)接口技术,即微型机与过程通道及外部设备连接的接口技术。对微机控制系统来说,一般有四种基本类型(见图1)。 First, the definition and classification of the interface The broad definition of the interface refers to the computer system connected to each other two components of the control logic, such as the connection between the CPU and memory called the memory interface; CPU and I / O devices The connection is called the input and output interface; the connection between the microcomputer and the microcomputer is called the microcomputer connection interface. This talk focuses on the input / output (I / O) interface technology, that is, the interface between the microcomputer and the process channel and external devices. For computer control systems, there are generally four basic types (see Figure 1).