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IC660EBD024
IC660EBD024
IC660EBD024
IC660EBD024
并行数据传送的特点是：各数据位同时传送，传送速度快、速率高，多用在实时、快速的场合。
并行传送的数据宽度可以是1位～128位，甚至更宽，但是有多少数据位就需要多少根数据线，因此传送的成本高。在集成电路芯片的内部，同一插件板上各部件之间，同一机箱内各插件板之间的数据传送都是并行的。
并行数据传送只适用于近距离的通信，通常小于30CM。
并行数据传送只适用于近距离的通信，通常小于30CM。
2．串行通信
串行通信是指通信的发送方和接收方之间数据信息的传输是在单根数据线上，以每次一个二进制的0、1为最小单位逐位进行传输，如图２所示。
串行数据传送的特点是：数据传送按位顺序进行，最少只需要一根传输线即可完成，节省传输线。与并行通信相比，串行通信还有较为显著的优点，传输距离长，可以从几米到几千米。在长距离内串行数据传送速率会比并行数据传送速率快，串行通信的通信时钟频率容易提高，串行通信的抗干扰能力十分强，其信号间的互相干扰完全可以忽略。但是串行通信传送速率比并行通信慢得多，并行通信时间为T，则串行时间为NT。
正是由于串行通信的接线少、成本低，因此它在数据采集和控制系统中得到了广泛的应用，产品也多种多样。RS-232的通信距离一般为15米，波仕电子的RS-232可以达到500米（产品型号EX232）以上。RS-485的通信距离一般为1200米，波仕电子可以做到1800米（产品型号：485C、485A)甚至4800米（产品型号：G485EX）。
二 串行通信工作模式
通过单线传输信息是串行数据通信的基础。数据通常是在两个站（点对点）之间进行传送，按照数据流的方向可分成3种传送模式：单工、半双工、全双工。
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