1．并行通信与串行通信
通信的基本方式可分为并行通信与串行通信两种方式。
并行通信是指数据的各个位同时进行传输的一种通信方式
优点：传输速度快
缺点：数据有多少位就需要多少根传输线，所以在位数多、传输距离远时，通信线路复杂，成本高。
串行通信是指数据一位一位地传输的方式。这种通信方式的数据传输只需一、两 根传输线，通信线路简单，成本低，特别适用于远程通信，但传输速度较慢。多用于传输距离长、低速度的场合。
２．串行通信的类型
目前，串行通信主要有两种类型：异步通信和同步通信。
３．串行通信的连接方式
串行通信有三种连接方式：单工方式、半双工方式和全双工方式
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