The problem in the communication between DSP and PC based on RS-485 is presented, and the solution of common-mode disturbance and EMI which are generated by incorrect ground connection is stated.

DSP与PC机的通讯以RS-485为基础，分析了RS-485总线在组网过程中因地线的不正确连接引发的共模干扰和EMI问题，并提出了解决方法。

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PC and DSP can exchange data each other through RS-232C serial communication.

上下位机之间通过RS-232C串行通讯交换数据。

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An intelligent inducing ventilating control system of underground garage was composed of many inducing ventilating controllers, RS-485 communication network and PC monitor modules.

地下车库的智能型诱导通风控制系统由多个诱导风机控制器、RS - 485通信网络及PC监控模块组成。

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