程序功能：接收来自PC机的字符，然后重新发送给PC机

通信格式：N.8.1, 9600

无校验，8个数据位，1个停止位，波特率9600

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测试说明：打开SSCOM，正确设置通信格式，向学习板发送一个

字符或者是字符串（字符和字符串结尾必须添加结束

符 \ ），观察PC机是否正确收到回发的字符-Program features: Receive the characters from the PC, and then re-sent to the PC, communication format: N.8.1, 9600 no parity, 8 data bits, 1 stop bit, baud of 9600------------------------------------------------------ Test Descr iption: Open SSCOM, properly set up communication format, to learn from board to send a character or a string (characters and end of the string must be added to end of the character ' \' ), observe the PC, the correct characters received back