目录一、RS232的串口通讯...............................................................................3应用..........................................................................................3工作方式......................................................................................3接口标准......................................................................................4电路组成......................................................................................4概述......................................................................................4简介......................................................................................4二、RS485串行通讯.................................................................................4简介..........................................................................................5接口..........................................................................................5电缆..........................................................................................5布网..........................................................................................6区别..........................................................................................6三、串行通信......................................................................................7概念..........................................................................................7分类..........................................................................................8同步通信..................................................................................8异步通信..................................................................................8特点..........................................................................................8形式和标准....................................................................................8调幅方式..................................................................................8调频方式..................................................................................9数字编码方式..............................................................................9数据传输率................................................................................9发送时钟和接收时钟.......................................................................10异步通信协议.................................................................................10通信协议.....................................................................................11普遍协议.................................................................................11USB......................................................................................12IEEE1394................................................................................12相关应用.....................................................................................13四、通讯协议.....................................................................................13简介.........................................................................................13详细介绍.....................................................................................14TCP/IP...................................................................................14IPX/SPX..................................
