The character of RS-232 interface chips MAX 2501251 is introduced in this paper, and its application in adding a RS-232 interface to MCU system is given, at last, the serial communication program is given also.

• 本文介绍了 RS－232串行通讯接口芯片 MAX250/251的性能特点，并结合实例给出了它们在给单片机加装 RS－232接口中的应用，最后还给出了其串行通讯程序。