用这个工具调试一下，确认是没发出来还是你的串口应用程序不显示00字符。
注意：一定按照下面详细使用方法里说明的顺序操作。
下载地址：
http://download.cnet.com/ComTrac ... 6892.html?tag=mncol
感觉好别忘了给个review(评论)，谢谢！
FAQ
How to use it?
1.Run ComTrace
2.Select serial port name(e.g. COM1)
3.Run serial port application program that you want to debug(e.g. Windows HyperTerminal)
4.debug......(e.g. press any key in Windows HyperTerminal, then watch the data that is captured.)
5.Close application program(e.g. Windows HyperTerminal)
6.Close ComTrace
Notice: You must operate by the order, only support Win2000 and WinXp(32 bit) system!
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