现代电子技术

在功能比较复杂的自动控制系统中,通常以工控机为上位机,单片机为下位机,RS 232串口通信是工控机和单片机之间信息传递的枢纽,采用MAX232实现TTL逻辑电平和RS 232电平之间的相互转换,如此连接,既可体现出单片机的灵活控制功能,又可发挥出PC机强大的计算和显示功能,有利于对现场信号的实时采集、处理和监控,确保了良好的人机界面的交互性。

In function relatively-complicated automatic control system,IPC is usually used as a upper computer,MCU as a lower computer,RS232 serial port as a messaging hub of communication between IPC and SCM,and MAX232 is adopted to implement the mutual conversion between TTL logic level and RS232 level.Such a connection can embody the flexible control function of SCM,express the powerful computation and display functions of PC,and is of benefit to signal real-time acquisition,processing,and monitoring on site,so as to ensure the perfect interactivity of man-machine interface.