间隔设备层主要为:多功能网络电力仪表和预付费多功能电表。这些装置分别对应相应的一次设备安装在电气柜内,这些装置均采用RS485通讯接口,通过现场MODBUS总线组网通讯,实现数据现场采集。
网络通讯层主要为:通讯服务器,其主要功能为把分散在现场采集装置集中采集,同时远传至站控层,完成现场层和站控层之间的数据交互。
站控管理层:设有高性能服务器、显示器、UPS电源、打印机等设备。监控系统安装在计算机上,集中采集显示现场设备运行状况,以人机交互的形式显示给用户。
以上网络仪表均采用RS485接口和MODBUS-RTU通讯协议,RS485采用屏蔽线传输,一般都采用二根连线,接线简单方便;通讯接口是半双工通信即通信的双方都可以接收、发送数据但是在同一时刻只能发送或接收数据,数据最高传输速率为10Mbps。
RS485接口是采用平衡驱动器和差分接收器的组合,抗噪声干扰能力增强,总线上允许连接多达32个设备,最大传输距离为1.2km。
2、远程预付费电能管理主要功能
整个系统软件设计分为三个大块,分别是集中抄表服务系统,远程预付费电能管理系统,以及用户查询系统。
集中抄表服务程序常年运行,不间断定时对所有表进行远程抄表;远程预付费系统包含所有***、售电、遥控及报表功能;用户查询机系统用于商铺查询个人信息、充值和用电情况;另外还可配置手机端查询网站,可用于商铺用户在手机网站终端上实时查询个人信息、充值、远程控制及每日用电情况,如果条件满足,还支持用户使用支付宝银联等方式远程自助购电。
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