The one I linked should work for the 340/341 I don't have an adapter with that chip so I can't test it. As long as your environment is WINDOWS 98/ME/2000/XP/Server 2003/VISTA/Server 2008/Win7/Win8 it should work for you. Open the .zip, open the ch341ser folder, and double click the setup.exe for 32bit or in the drvsetup64 folder the drvsetup64.exe for a 64bit install. Plug in the module and it should show up in the device manager as a com port.