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我公司采用的是prolific公司产的USB芯片，厂家提供支持win7的驱动。欢迎下载试用。

PL2303_Prolific_DriverInstaller_v10518.zip
2009/7/23v1.0.5.182318 KBPL-2303 USB to Serial Bridge (H, HX, X) Installshield Driver Setup Program
Installer & Build date: 1.0.5.18 (20090723)
Windows 98/ME Driver: v2.0.0.19
Windows 2000/XP/Server2003 (32 & 64-bit) WDM Driver: v2.0.9.122
Windows Vista/7/Server2008 (32 & 64-bit) WDF Driver: v3.3.5.122
NOTE: For Windows 7, please use RC build 7100 or RTM Final version. (Installer program will not run on early Windows 7 or Beta versions)