The already suggested tpapro will probably also do it, but I myself use TComport, which I consider slightly easier to use. It will has an event property onrxchar that triggers whenever a character arrives (and several options for other kinds of packets, including ASCII linediscipline).
I use it pretty much for the same kind of stuff, albeit with microchips mcus.
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http://sourceforge.net/projects/tpapro/ 是一个免费软件工具，我们使用得很好成功多年。
http://sourceforge.net/projects/tpapro/ is a freeware tool we've used with great success for many years.
已经建议的 tpapro 可能也会这样做，但我自己使用 TComport，我认为它稍微容易一些使用。它将有一个 onrxchar 事件属性，每当字符到达时就会触发该属性（以及其他类型数据包的多个选项，包括 ASCII linediscipline）。
我几乎用它来做同样类型的事情，尽管是用微芯片 MCU。
The already suggested tpapro will probably also do it, but I myself use TComport, which I consider slightly easier to use. It will has an event property onrxchar that triggers whenever a character arrives (and several options for other kinds of packets, including ASCII linediscipline).
I use it pretty much for the same kind of stuff, albeit with microchips mcus.
我已经使用 WinSoft 的 Comport 库很多年了。它非常出色（0 个错误）并且适用于任何版本的 Windows。
链接为：http://www.winsoft.sk/comport.htm
I've used the Comport library of WinSoft for many... years. It´s excellent (0 bugs) and works with any version of windows.
The link is: http://www.winsoft.sk/comport.htm