利用8031单片机串行口，实现两个实验台之间的串行通讯。其中一个实验台作为发送方，另一侧为接收方。发送方读入按键值，并发送给接收方，接收方收到数据后在LED上显示。-use 8031 serial port to achieve a test between two serial communications. One experiment Taiwan as the sender, on the other side of the receiver. Send to read keys value, and send it to receive and receiving parties, having received the information displayed on the LED.