USB to RS-422 / RS-485 Adapter
Figure 2.14
2. Installing Using DPInst
In the case of a Microsoft WHQL certified driver package, it is possible to preinstall the driver package using
the Microsoft Driver Install Frameworks (DIFx) tools. The simplest tool provided is the Driver Package
Installer (DPInst). When placed in the same directory as the INF files for the driver package, simply run
DPInst.exe and the certified driver package will be installed on the machine.
The current driver package supports 32bit and 64bit systems through common INF files. DPInst has
separate executables for 32bit and 64bit installation. This means that if a single solution is desired for 32bit
and 64bit systems, the developer must be able to detect which version of DPInst is required for the system
the driver is being installed on.
For more information on DPInst, see the FTDI Windows Driver Installation application note.
3. Installing From Windows Update
If a certified driver is available for the target operating system, it is possible to install the driver from the
Windows Update web site.
Directions to install the driver from Windows Update are very similar to those outlined in 2.1 Installing Via
The New Hardware Wizard, except that the “Yes, this time only” or “Yes, now and every time I connect a
device” option should be selected on the first screen of the wizard when asked if Windows Update should
be checked for a driver. If the wizard finds a matching driver on Windows Update, the driver will be
automatically downloaded and installed for the device.
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