1734-IA4

1734-IA4

1734-IA4

1734-IA4

LNS(LonWorks Network Services)是ECHELON提供的一个专为LonWorks网络服务的网络操作系统。LNS封装了对LonWorks网络的各种操作，如：网络安装、网络维护、变量连接等。在Windows环境下，LNS提供了基于ActiveX和COM组件方式的开发接口。这两种方式在功能和性能上都没有什么差异，而ActiveX使用起来更为简便，一般也不需要开发人员了解很多OLE方面的知识，因而更易于被接受。本文所列举的实例采用的就是ActiveX方式。

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采用ActiveX方式开发LonWorks网络通信接口可选择的开发工具十分丰富。Visual C++ 6.0目前仍然是开发自动化软件的主流工具之一。当在VC环境下用ActiveX接口开发LonWorks网络通信接口程序时，在实现过程和方法上与其它语言差别不大。只是在一些与VC语言特性相关的环节上，如果处理不当，就会影响接口程序的健壮性、稳定性。 
LNS由LNS Server、LNS Object Server COM Component、Data Server和Network Interface几个主要部分组成，提供了从网络变量监测到网络管理和维护等完整的功能接口。在开发LonWorks网络数据监控接口程序时，涉及的只是其中的数据监控部分的功能。

3 LNS实现监控的过程
   LNS提供了两种网络监控方式，一种是监控集(Monitor set)方式，一种是单点(Single point)方式。两种方式都是以监控点(Monitor points)为基本单位。一个监控点对应一个网络变量或应用消息。
监控集建立后就被保存在Data Sever中，即使应用程序关闭也仍然存在。单点方式每次都需要应用程序重新创建，退出时释放。监控集方式适用于监控任务比较繁重的场合，单点方式适合监控任务较轻，点数较多的情况。
   无论是监控集或是单点方式，都要使用监控点。监控点有以下几种监控方式：显式读写、隐式绑定、查询、显示绑定。
   对于显式读写方式，接口程序可以直接读写监控点的数值。在隐式绑定方式下，可以将一个监控点与一个节点的网络变量绑定，当网络变量变化时，会用事件NvMonitorUpdateEvent通知接口程序，接口程序根据消息参数可以取得更新的数据。当使用查询方式时，每隔一个周期就触发一次NvMonitorUpdateEvent事件。当使用显式绑定方式时，对应设备结点的一个或多个网络变量，要在上位机上创建并绑定一个网络变量，而这个网络变量又可以用其它三种方式进行监控。这种方式主要为了实现用一个监控点同时监测多个结点网络变量。

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