本文介绍了一种基于公共电话网（PSTN）的电梯安全呼叫系统，采用总线拓扑结构和DTMF 信号对电梯群进行组网，构成由电梯分机、机房电话和小区管理中心的管理主机组成的小区电梯安全呼叫网络，并通过管理主机实现与公共电话网通信。本文重点讲述了管理主机部分的软件设计。关键字：公共电话网 双音多频 电梯呼叫系统 uC/OS-IIAbstract: The article designs a kind of elevator call system based on PSTN. This systemorganizes elevator group as a network, and makes up of the community elevator call system which is constituted by elevator extension、central room telephone and the community’s manage host phone by adopting the bus topology and using DTMF as the system’s signal. The system can communicate with the public switching telephone network through the community’s manage host phone. The article mainly introduces the software design of the community’s manage host phone.Keywords: PSTN DTMF Elevator Call System uC/OS-II
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