The selection of the communication mode, setting of the baud rate of the 89C51 and its setting of communication are stated in detail. Through the analysis of the hardware and software design of the interface circuit, its practicability is presented.

• 通过对系统的通信方式选择 89C5 1通信波特率的设置、通信的设置 ；以及对接口电路的软件和硬件的设计分析 ；展示了该电路的实用性 .