（找了好几个，终于找到个能用的，分享给大家）USB转串口驱动程序，CH340,CH341,实测win7 32位和64位均安装成功，来源于网络(usb-serial driver, CH340 and CH341, successfully installed on my 32bit and 64bit computers, loaded at the website: www dot drv5 dot cn)