prolific usb-serial USB --串口转换线，首先需要在win7上安装对应的 USB--串口转换线 驱动程序， PL2303_Prolific 驱动程序下载地址
USB to I/O Port Controllers PL-2303 驱动程序下载地址：
http://www.prolific.com.tw/eng/downloads.asp?ID=31
PL2303_Prolific_DriverInstaller_v130.zip，支持win7 32位/64位，发布日期为2010/7/15，版本v1.3.0，文件大小为2315 KB。具体下载地址如下：
http://www.prolific.com.tw/support/files/%5CIO%20Cable%5CPL-2303%5CDrivers%20-%20Generic%5CWindows%5Callinone%5CPL2303_Prolific_DriverInstaller_v130.zip
putty 来代替，串口串行口：COM7（就是上面驱动安装完成提示的），连接时选择Serial ，传输速率填写 115200，然后就可以连接成功，如图所示
如有乱码则设置putty语言为utf-8，如图所示
3、除了 Putty，还可以使用 realterm 来代替，Realterm is a terminal program specially designed for capturing, controlling and debugging binary and other difficult data streams. It is far better for debugging comms than Hyperterminal. It has no support for dialing modems, BBS etc - that is what hyperterminal does.下载地址：
http://sourceforge.net/projects/realterm/files/
http://www.liuzhigong.com/download/Realterm_2.0.0.57_setup.rar
如何保存log
