FTDI Settings Update is a C# .net console utility application.

Written by Max, NG7M ng7m@arrl.net  USE AT YOUR OWN RISK!

This windows console application will enumerate through your FTDI registry
settings and disable serial port enumeration and modem control at startup
options for all connected FTDI USB to serial ports.

By default FTDI driver settings enable the serial enumerator and modem control
at operating system boot up.  Why is this a problem amateur Radio operators?

Keep reading...

The issue for amateur radio operators with these default settings is when
they have FTDI USB serial ports connected to their transceiver and connected
FTDI USB to serial adapters are setup to key the transceiver via the RTS or
DTR serial lines.  This is common for keying the transceiver for sending CW,
keying PTT, shifting between mark and space with FSK, etc.

When windows boots up, default FTDI settings will enumerate through your
connected FTDI USB serial ports, including those built into your transceiver
and potentially key your transceiver at boot time.  If you transceiver is on
and you are using an amplifier etc, this can be of concern.  And this default
behavior is annoying.  This enumeration causes your FTDI serial port DTR and
RTS lines be activated and your transceiver could be keyed several times
as your computer boots up.

It is possible to manually go to the Windows Device Manager and update the 
settings on a port by port basis, but if there are windows updates to 
FTDI USB to serial drivers, the driver defaults are set again and the user
is required to manually go through all of their FTDI serial ports and update
the settings again (painful if you have several FTDI serial ports).

This utility was created to automate updating settings for all of your
connected FTDI USB to serial ports.

Download the zip file and extract it to a folder on your desktop or other
folder of your choice.  Make sure you extract all the files in the zip file
to the location where you will run FTDI Settings Update.exe

This utility requires administrator privileges to update FTD registry
settings and you be asked by windows if you want to allow this utility
to modify your computer registry.

When the utility first runs it will ask you if you want to continue and
check the registry for required changes to each FTDI serial port detected.

If you press (Y/y)yes to continue, you will see console output of the state of
each FTDI serial port and if changes were made.  If any changes were made
to the settings, you will be presented with a message that you may need
to reboot your computer for the changes to take effect.

You can run this utility more than once with no harm and you will see 
the current state of two settings per FTDI serial port, the serial enumerator
and modem control at startup are the two settings that are checked and
updated if needed.

You can also manually open the windows device manager and view these settings
for each of your FTDI USB serial ports under the device manager Ports(COM & LTP)
section in the device manager (WinKey+X M, will load the device manager UI).

This console application was written in C# and targets the .NET 4.0 runtime.
It's expected that you are running Windows 10 or later, but it should work
on Windows 7.  I have tested it on both Windows 10 and Windows 11 as of the
time I created it.

I hope you find this useful.  Max NG7M, ng7m@arrl.net