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系统网络
该系统主要是通过GPRS DTU和移动公司GPRS网络来完成。DTU主要完成HOLLiAS-PLC G5与调
度中心数据传输转发的任务,同时也是与移动GPRS网络的工作接口。主要设置的参数如下:
(1) 与移动GPRS APN(访问结点网络)方式。APN主要有以下两种:CMNET和专线访问。CMNET
利用的是移动的公众网络,安全性和数据传输控制性相对专线访问方式存在一些弊端,因此,
笔者选择的是专线访问这种方式。
(2) 数据发送目的地,即数据中心服务器或者路由器的IP地址或者域名。
(3) 与HOLLiAS-PLC G5 CP240的接口参数,包括波特率、停止位、奇偶校验、数据位、流控制。
(4) DTU对于不同地区GPRS网络质量的一些参数配置。
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