AVR-Chat

On Wed, Feb 24, 2010 at 11:23 AM, Tim McDonough <tmcdonough@gmail.com> wrote:
> Even
> when they are individually attached to the same USB port they do not
> attach to the same virtual COM port. You can go into Windows and
> change the port but that would be a pain in a lot of applications. It
> would be nice if you could tell the driver to "always use COM5" or
> whatever.

This should work for non-FTDI devices, just match the VID/PID.

From FTDI Support:

Hello,

What you will need to do is uninstall the driver for the FTDI device. Now
you will need to create a binary value in the registry by doing the
following:

Go to START and select RUN

Type regedit in the filed and select ok to get into the registry

Add a REG_BINARY value called IgnoreHWSerNum to the registry and setting it
to 01.

This value is held in the registry key located at:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\UsbFlags\IgnoreHWSerNum
(Device VID, PID and interface}

For a default FTDI device ID (VID 0x0403, PID 0x6001), add the following
registry REG_BINARY value set to 01:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\UsbFlags\IgnoreHWSerNum0
4036001

Now install the driver again. After this the com port should not increment.

Regards

James Leary
Support Engineer
FTDI Ltd


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