【摘要】 在现场通信领域，串行通信具有抗干扰能力强、可靠性高、实时、布线简单等优点。设计的多终端呼叫系统主要实现紧急报警和多点一对多的呼叫功能，在工程电梯、船载通信、矿山煤场、地下开采等特殊工程领域具有广泛的应用。通信模块是基于控制器MC68HC908JL16进行设计开发，利用四运放器（LF347）设计信号调制与解调电路，以及音调解码器（LM567）对信号进行检测，结合控制软件实现总线仲裁。最后搭建了实验环境，对多终端呼叫系统进行测试。更多还原

【Abstract】 Serial communication has the advantages of strong anti-interference ability, high reliability, real-time and simple wiring in field communication. According to the field requirement, the following multi-terminal call system can send emergency alarm anytime and broadcast from any stations with one wire. It can be used in many special engineering fields such as elevators, ships and mining. The communication module is based on the MCU MC68HC908JL16. The QUAD OPERATIONAL AMPLIFIERS(LF347) is used for signal modulation and demodulation, and the tone decoder(LM567) is used for signal detection. With the software, bus arbitration can be achieved.更多还原