Knowledge Base  | | HO820: Driver installation (ID #645) Please note that a double (manual) driver installation is required. In the ZIP file of the HO820 driver you can find two different driver files: FTDIBus.inf for the native USB driver and FTDIPort.inf for the virtual COM port (VCP). You have to install both. More detailed information you can find in the manual of the HO820 interface. 
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