按同步方式
同步通信
<pre id="best-content-294559906" accuse="aContent" class="best-text mb-10" style="margin-top: 10px; margin-bottom: 10px; padding: 0px; font-family: "Microsoft YaHei", arial, "courier new", courier, 宋体, monospace; white-space: pre-wrap; word-wrap: break-word; font-size: 16px; line-height: 29px; color: rgb(51, 51, 51); min-height: 55px;"><a href="https://www.baidu.com/s?wd=%E5%90%8C%E6%AD%A5%E4%BC%A0%E8%BE%93&tn=44039180_cpr&fenlei=mv6quAkxTZn0IZRqIHckPjm4nH00T1YLujR3P1TkuW6LrAfsn1Nh0ZwV5Hcvrjm3rH6sPfKWUMw85HfYnjn4nH6sgvPsT6KdThsqpZwYTjCEQLGCpyw9Uz4Bmy-bIi4WUvYETgN-TLwGUv3Erj6YPHnvnWn" target="_blank" class="baidu-highlight" rel="nofollow" style="color: rgb(63, 136, 191); text-decoration: none;">同步传输</a>的比特分组要大得多。它不是独立地发送每个字符，，而是把它们组合起来一起发送。我们将这些组合称为数据帧，或简称为帧。</pre>
<pre id="best-content-294559906" accuse="aContent" class="best-text mb-10" style="margin-top: 10px; margin-bottom: 10px; padding: 0px; font-family: "Microsoft YaHei", arial, "courier new", courier, 宋体, monospace; white-space: pre-wrap; word-wrap: break-word; font-size: 16px; line-height: 29px; color: rgb(51, 51, 51); min-height: 55px;">同步传输方式中发送方和接收方的时钟是统一的、字符与字符间的传输是同步无间隔的</pre>
<pre id="best-content-294559906" accuse="aContent" class="best-text mb-10" style="margin-top: 10px; margin-bottom: 10px; padding: 0px; font-family: "Microsoft YaHei", arial, "courier new", courier, 宋体, monospace; white-space: pre-wrap; word-wrap: break-word; font-size: 16px; line-height: 29px; color: rgb(51, 51, 51); min-height: 55px;"><a href="https://www.baidu.com/s?wd=%E5%90%8C%E6%AD%A5%E4%BC%A0%E8%BE%93&tn=44039180_cpr&fenlei=mv6quAkxTZn0IZRqIHckPjm4nH00T1YLujR3P1TkuW6LrAfsn1Nh0ZwV5Hcvrjm3rH6sPfKWUMw85HfYnjn4nH6sgvPsT6KdThsqpZwYTjCEQLGCpyw9Uz4Bmy-bIi4WUvYETgN-TLwGUv3Erj6YPHnvnWn" target="_blank" class="baidu-highlight" rel="nofollow" style="color: rgb(63, 136, 191); text-decoration: none;">同步传输</a>通常要比异步传输快速得多。接收方不必对每个字符进行开始和停止的操作</pre>
异步通信
<pre id="best-content-294559906" accuse="aContent" class="best-text mb-10" style="margin-top: 10px; margin-bottom: 10px; padding: 0px; font-family: "Microsoft YaHei", arial, "courier new", courier, 宋体, monospace; white-space: pre-wrap; word-wrap: break-word; font-size: 16px; line-height: 29px; color: rgb(51, 51, 51); min-height: 55px;">异步传输将比特分成小组进行传送，小组可以是8位的1个字符或更长</pre>
<pre id="best-content-294559906" accuse="aContent" class="best-text mb-10" style="margin-top: 10px; margin-bottom: 10px; padding: 0px; font-family: "Microsoft YaHei", arial, "courier new", courier, 宋体, monospace; white-space: pre-wrap; word-wrap: break-word; font-size: 16px; line-height: 29px; color: rgb(51, 51, 51); min-height: 55px;">异步传输存在一个潜在的问题，即接收方并不知道数据会在什么时候到达</pre>
区别
<pre id="best-content-294559906" accuse="aContent" class="best-text mb-10" style="margin-top: 10px; margin-bottom: 10px; padding: 0px; font-family: "Microsoft YaHei", arial, "courier new", courier, 宋体, monospace; white-space: pre-wrap; word-wrap: break-word; font-size: 16px; line-height: 29px; color: rgb(51, 51, 51); min-height: 55px;">1,异步传输是面向字符的传输，而同步传输是面向比特的传输。<br>2,异步传输的单位是字符而同步传输的单位是桢。<br>3,异步传输通过字符起止的开始和停止码抓住再同步的机会，而同步传输则是以数据中抽取同步信息。<br>4,异步传输对时序的要求较低，同步传输往往通过特定的时钟线路协调时序。<br>5,异步传输相对于同步传输效率较低。</pre>
