The ward calling system is designed by using single chip microcomputer,and the hardware circuit and software design are analyzed.The system realizes the exchange between voice signal and calling signal by power-carrier communication technique.The MCS8051 SCM is used to control the system host machine, and the PIC12C508 SCM is used to control the calling slave machine.The display chip adopts AT89C2051 SCM, the data communication adopts serial asynchronous half-duplex communication.This system has many merits such as low price, high reliability, powerful function, and is easy to install.%利用单片机设计了病房呼叫系统,分析了硬件电路与软件设计.该系统采用电源栽渡技术,利用系统的两芯电源线,实现语音信号和呼叫信号的交换.系统主机由MCS8051单片机实现,呼叫分机选用PIC12C508单片机,显示主控芯片选择51类的AT89C2051单片机,通信方式采用串行异步半双工通信方式.系统具有可靠性高、成本低、功能强大、安装方便等优点,具有较强的实用价值.
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