【摘要】 讨论了在线监控系统的应用背景和现状，叙述了短消息业务的原理与特点，提出并实现了基于SMS的在线监控系统模型、系统不同实体间的通信协议和无线数据终端以及基于代理的应用服务器。其中，无线数据终端利用SMS实现数据传输；应用服务器采用了基于代理的中间件技术，增加了系统的可靠性和可扩展性。更多还原

【Abstract】 This paper discusses the application background and the status of on-line monitoring system,describes the priciples and the features of short message service(SMS),proposes and implements SMS-based on-line monitoring system model. For the implementation model, it presents the communication protocols among different entities and implements wireless data terminal(WDT) that transport data by SMS and the agent-based application server. Application server adopting the middleware technology based on the agent is the kernel of the process platform,which improves the reliability & extensiblility of the system.更多还原