采用单片机AT89S52进行串口通信系统的设计，本设计实现了串口通信所需的一些基本功能，通过MAX232芯片进行数据转换，并通过1602LCD液晶屏显示实时接收数据。压缩包里的原理图和PCB部分采用Altium Designer 10专业软件来设计。　

功能：(1)下位机选用89S51或89S52单片机；

　(2)下位机接收上位机的数据并显示在LED或LCD上；

　(3)下位机显示数据可以显示固定数据、位移数据、循环位移；-AT89S52 microcontroller design using serial communication system, the design and implementation of some of the basic functions required for serial communication, data conversion through the MAX232 chip, and receive real-time data display via 1602LCD LCD screen. Compressed bag partially schematic and PCB using Altium Designer 10 professional software to design. Features: (1) lower machine selection 89S51 or 89S52 microcontroller　(2) lower machine receives PC data and displayed on the LED or LCD　(3) lower machine display data can be displayed fixed data, displacement data, cyclic displacement