00000005.htm

来自「水木社区 embeded 版精华区 下载」· HTM 代码 · 共 49 行

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<?xml version="1.0" encoding="gb2312"?><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=gb2312"/><title>Xon/Xoff（英文）                       turbolinux </title></head><body><center><h1>BBS 水木清华站∶精华区</h1></center><a name="top"></a>发信人:&nbsp;jingjm&nbsp;(jimmy),&nbsp;信区:&nbsp;Embedded&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br />标&nbsp;&nbsp;题:&nbsp;Xon/Xoff（英文）&nbsp;<br />发信站:&nbsp;BBS&nbsp;水木清华站&nbsp;(Fri&nbsp;Sep&nbsp;13&nbsp;11:41:21&nbsp;2002),&nbsp;站内信件&nbsp;<br />&nbsp;<br />Xon/Xoff&nbsp;(sometimes&nbsp;written&nbsp;&quot;X-on/X-off&quot;&nbsp;or&nbsp;&quot;XON/XOFF&quot;&nbsp;and&nbsp;pronounced&nbsp;&nbsp;<br />eks-AWN&nbsp;eks-AWF)&nbsp;is&nbsp;a&nbsp;protocol&nbsp;for&nbsp;controlling&nbsp;the&nbsp;flow&nbsp;of&nbsp;data&nbsp;between&nbsp;&nbsp;<br />computers&nbsp;and&nbsp;other&nbsp;devices&nbsp;on&nbsp;an&nbsp;asynchronous&nbsp;serial&nbsp;connection.&nbsp;&nbsp;<br />&nbsp;<br />For&nbsp;example,&nbsp;a&nbsp;computer&nbsp;typically&nbsp;sends&nbsp;data&nbsp;to&nbsp;a&nbsp;printer&nbsp;faster&nbsp;than&nbsp;the&nbsp;&nbsp;<br />printer&nbsp;can&nbsp;print.&nbsp;The&nbsp;printer&nbsp;contains&nbsp;a&nbsp;buffer&nbsp;where&nbsp;data&nbsp;is&nbsp;stored&nbsp;until&nbsp;&nbsp;<br />the&nbsp;printer&nbsp;catches&nbsp;up&nbsp;with&nbsp;the&nbsp;computer.&nbsp;If&nbsp;the&nbsp;buffer&nbsp;becomes&nbsp;full&nbsp;before&nbsp;&nbsp;<br />the&nbsp;printer&nbsp;catches&nbsp;up,&nbsp;a&nbsp;small&nbsp;microprocessor&nbsp;in&nbsp;the&nbsp;printer&nbsp;sends&nbsp;back&nbsp;an&nbsp;&nbsp;<br />X/off&nbsp;signal&nbsp;to&nbsp;stop&nbsp;sending&nbsp;data.&nbsp;When&nbsp;enough&nbsp;data&nbsp;is&nbsp;printed&nbsp;and&nbsp;buffer&nbsp;&nbsp;<br />storage&nbsp;becomes&nbsp;free,&nbsp;the&nbsp;printer&nbsp;sends&nbsp;an&nbsp;X/on&nbsp;signal&nbsp;telling&nbsp;the&nbsp;computer&nbsp;&nbsp;<br />to&nbsp;resume&nbsp;sending&nbsp;data.&nbsp;&nbsp;<br />&nbsp;<br />The&nbsp;&quot;X&quot;&nbsp;stands&nbsp;for&nbsp;&quot;transmitter&quot;&nbsp;so&nbsp;the&nbsp;X/on&nbsp;and&nbsp;X/off&nbsp;are&nbsp;signals&nbsp;to&nbsp;turn&nbsp;a&nbsp;&nbsp;<br />transmitter&nbsp;on&nbsp;or&nbsp;off.&nbsp;The&nbsp;actual&nbsp;signal&nbsp;for&nbsp;X/on&nbsp;is&nbsp;the&nbsp;same&nbsp;bit&nbsp;configuration&nbsp;<br />as&nbsp;the&nbsp;ASCII&nbsp;Ctrl-Q&nbsp;keyboard&nbsp;combination.&nbsp;The&nbsp;X/off&nbsp;signal&nbsp;is&nbsp;the&nbsp;Ctrl-S&nbsp;&nbsp;<br />character.&nbsp;&nbsp;<br />&nbsp;<br />When&nbsp;you&nbsp;define&nbsp;your&nbsp;modem&nbsp;to&nbsp;your&nbsp;computer's&nbsp;operating&nbsp;system,&nbsp;you&nbsp;may&nbsp;need&nbsp;&nbsp;<br />to&nbsp;specify&nbsp;the&nbsp;use&nbsp;of&nbsp;flow&nbsp;control&nbsp;with&nbsp;X/on/Xoff&nbsp;or&nbsp;with&nbsp;CTS/RTS&nbsp;(Clear&nbsp;to&nbsp;&nbsp;<br />Send/Ready&nbsp;to&nbsp;Send).&nbsp;When&nbsp;sending&nbsp;binary&nbsp;data,&nbsp;Xon/Xoff&nbsp;may&nbsp;not&nbsp;be&nbsp;recognized&nbsp;&nbsp;<br />because&nbsp;it&nbsp;is&nbsp;character-encoded.&nbsp;&nbsp;<br />&nbsp;<br />&nbsp;<br />&nbsp;&nbsp;<br />&nbsp;<br />--&nbsp;<br />&nbsp;<br />※&nbsp;来源:·BBS&nbsp;水木清华站&nbsp;smth.edu.cn·[FROM:&nbsp;166.111.65.245]&nbsp;<br /><a href="00000005.htm">上一篇</a><a href="javascript:history.go(-1)">返回上一页</a><a href="index.htm">回到目录</a><a href="#top">回到页首</a></center><center><h1>BBS 水木清华站∶精华区</h1></center></body></html>

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