<p align="left"> <?xml:namespace prefix = p ns = "urn:schemas-microsoft-com:office:powerpoint" /><p:colorscheme colors="#ffffff,#000000,#808080,#000000,#bbe0e3,#333399,#009999,#99cc00"></p:colorscheme> </p>
<div style="TEXT-ALIGN: center; mso-char-wrap: 1; mso-kinsoku-overflow: 1" class="O" align="left" v:shape="_x0000_s1026"><span style="FONT-FAMILY: SimSun; COLOR: #2957d7; FONT-SIZE: 20pt; mso-ascii-font-family: SimSun; mso-fareast-font-family: SimSun; mso-hansi-font-family: SimSun"><em> </em>现在市面上有一种假的TCP/IP门禁系统.采用普通485/232的门禁控制器+TCP/IP转换器来实现。这种实施模式,可以说市面上所有的门禁系统都可以通过这个方式网络</span><span style="FONT-FAMILY: SimSun; COLOR: #2957d7; FONT-SIZE: 20pt; mso-ascii-font-family: SimSun; mso-fareast-font-family: SimSun; mso-hansi-font-family: SimSun">化,来实现局域网内的门禁控制,其实这只是一个假的TCP/IP实现模式,只是转换器公司的一个销售产品的一个幌子。</span></div>
<div style="TEXT-ALIGN: center; mso-char-wrap: 1; mso-kinsoku-overflow: 1" class="O" align="left" v:shape="_x0000_s1026"><span style="FONT-FAMILY: SimSun; COLOR: #2957d7; FONT-SIZE: 20pt; mso-ascii-font-family: SimSun; mso-fareast-font-family: SimSun; mso-hansi-font-family: SimSun"></span> </div>
<div style="TEXT-ALIGN: center; mso-char-wrap: 1; mso-kinsoku-overflow: 1" class="O" align="left" v:shape="_x0000_s1026"><span style="FONT-FAMILY: SimSun; COLOR: #2957d7; FONT-SIZE: 20pt; mso-ascii-font-family: SimSun; mso-fareast-font-family: SimSun; mso-hansi-font-family: SimSun"><p:colorscheme colors="#ffffff,#000000,#808080,#000000,#bbe0e3,#333399,#009999,#99cc00"></p:colorscheme> </div>
<div style="TEXT-ALIGN: center; mso-char-wrap: 1; mso-kinsoku-overflow: 1" class="O" align="left" v:shape="_x0000_s1026"><span style="FONT-FAMILY: 华文新魏; COLOR: #ff3300; FONT-SIZE: 24pt; mso-ascii-font-family: 华文新魏; mso-fareast-font-family: 华文新魏; mso-hansi-font-family: 华文新魏; mso-fareast-language: ZH-CN" lang="EN-US"><span style="mso-spacerun: yes"> </span>为什么说"TCP/IP转换器+485控制器"的实施模式是"假TCP/IP</span><span style="FONT-FAMILY: 华文新魏; COLOR: #ff3300; FONT-SIZE: 24pt; mso-ascii-font-family: 华文新魏; mso-fareast-font-family: 华文新魏; mso-hansi-font-family: 华文新魏">门禁"? </span></div>
<div style="TEXT-ALIGN: center; mso-char-wrap: 1; mso-kinsoku-overflow: 1" class="O" align="left" v:shape="_x0000_s1026"><span style="FONT-FAMILY: 华文新魏; COLOR: #ff3300; FONT-SIZE: 24pt; mso-ascii-font-family: 华文新魏; mso-fareast-font-family: 华文新魏; mso-hansi-font-family: 华文新魏"></span> </div>
<div style="TEXT-ALIGN: center; mso-char-wrap: 1; mso-kinsoku-overflow: 1" class="O" align="left" v:shape="_x0000_s1026"><span style="FONT-FAMILY: 华文新魏; COLOR: #ff3300; FONT-SIZE: 24pt; mso-ascii-font-family: 华文新魏; mso-fareast-font-family: 华文新魏; mso-hansi-font-family: 华文新魏"><p:colorscheme colors="#ffffff,#000000,#808080,#000000,#bbe0e3,#333399,#009999,#99cc00"></p:colorscheme>
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<div style="mso-char-wrap: 1; mso-kinsoku-overflow: 1; mso-line-spacing: '130 0=" 0?? 0?><span style="FONT-FAMILY: SimSun; FONT-SIZE: 20pt; mso-ascii-font-family: SimSun; mso-fareast-font-family: SimSun; mso-hansi-font-family: SimSun; mso-fareast-language: ZH-CN" lang="EN-US"><span style="mso-spacerun: yes"> </span>这种实施方式是采用</span><span style="FONT-FAMILY: SimSun; COLOR: #ff3300; FONT-SIZE: 20pt; mso-ascii-font-family: SimSun; mso-fareast-font-family: SimSun; mso-hansi-font-family: SimSun">加装TCP/IP转换器将485和232串口信号转换为TCP/IP</span><span style="FONT-FAMILY: SimSun; COLOR: #ff3300; FONT-SIZE: 20pt; mso-ascii-font-family: SimSun; mso-fareast-font-family: SimSun; mso-hansi-font-family: SimSun">模式</span><span style="FONT-FAMILY: SimSun; FONT-SIZE: 20pt; mso-ascii-font-family: SimSun; mso-fareast-font-family: SimSun; mso-hansi-font-family: SimSun">通过局域网传输到计算机,计算机需要安装TCP/IP转换器驱动程序,将</span><span style="FONT-FAMILY: SimSun; FONT-SIZE: 20pt; mso-ascii-font-family: SimSun; mso-fareast-font-family: SimSun; mso-hansi-font-family: SimSun; mso-fareast-language: ZH-CN" lang="EN-US">TCP/IP型号虚拟成串口信号,原来的门禁软件无需改动,只需对虚拟串口操作。 </span></div>
<div style="mso-char-wrap: 1; mso-kinsoku-overflow: 1; mso-line-spacing: '130 0=" 0?? 0?><span style="FONT-FAMILY: SimSun; FONT-SIZE: 20pt; mso-ascii-font-family: SimSun; mso-fareast-font-family: SimSun; mso-hansi-font-family: SimSun"></span></div>
<div style="mso-char-wrap: 1; mso-kinsoku-overflow: 1; mso-line-spacing: '130 0=" 0?? 0?><span style="FONT-FAMILY: SimSun; FONT-SIZE: 20pt; mso-ascii-font-family: SimSun; mso-fareast-font-family: SimSun; mso-hansi-font-family: SimSun"><span style="mso-spacerun: yes"> </span>这种通讯方式存在一个致命的弱点---虚拟端口。常常出现传输速度慢,信</span><span style="FONT-FAMILY: SimSun; FONT-SIZE: 20pt; mso-ascii-font-family: SimSun; mso-fareast-font-family: SimSun; mso-hansi-font-family: SimSun">号不稳定常常导致传输中断、数据丢失等情况。严重时硬件设施遭到破坏,无</span><span style="FONT-FAMILY: SimSun; FONT-SIZE: 20pt; mso-ascii-font-family: SimSun; mso-fareast-font-family: SimSun; mso-hansi-font-family: SimSun">法继续使用。一台服务器虚拟端口越多,系统运行越不稳定。</span><span style="FONT-FAMILY: SimSun; FONT-SIZE: 20pt; mso-fareast-font-family: SimSun; mso-hansi-font-family: Arial">更不适合</span><span style="FONT-SIZE: 20pt; mso-fareast-font-family: SimSun; mso-hansi-font-family: Arial; mso-fareast-language: ZH-CN" lang="EN-US">internet</span><span style="FONT-FAMILY: SimSun; FONT-SIZE: 20pt; mso-fareast-font-family: SimSun; mso-hansi-font-family: Arial">广域网的数据通讯了。</span></div></div></span></div>
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[此贴子已经被作者于2009-12-9 10:47:09编辑过]
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