在多片单片机够成的多机通信系统中，主从式多机通信是多机通信中比较简单的通信方式。由于条件限制，本设计采用STC系列单片机开发板进行开发设计。硬件部分主要3块单片机开发板通过数据线连接而成。单片机板主要用到了，键盘、4位的LED显示器、MAX232芯片及数据线接口。3块单片机板，一块主机，另两块做从机。数据线是主机的TXD、RXD分别接从机的RXD、TXD-In single-chip multi-chip enough into the multi-communication system, the master-slave multi-machine communications is a multi-machine communication is relatively simple means of communication. Due to constraints, the design uses STC Series MCU development board to carry out development and design. Hardware some of the major three single-chip development board through data lines connected. Single-chip used in the main board, keyboard, four of the LED display, MAX232 chip and data-line interface. Three single-chip board, a host, and the other two do so from the machine. Data line is the host of the TXD, RXD, respectively, then from the machine RXD, TXD