[Elecraft] [Elecraft-K4] Warning: Windows 10 Update resets FTDI options back to defaults, keys radio

[steve WB3LGC]

Bob,  Thank you for the link to your Serial Interface Doc !!  I have not 
had "real" problems with COM ports, BUT it is nice to have a current 
reference in one package.  Thank you for doing the work.  73, steve WB3LGC

On 6/9/21 3:56 AM, Bob Wilson, N6TV wrote:
> I just installed a Windows 10 Update, and even before rebooting to 
> complete the install, I noticed that Windows had reset all my Elecraft 
> FTDI virtual COM port settings back to the (bad) FTDI defaults, which 
> means your PC can key your radio about 7 or 8 times every time Windows 
> restarts  or the USB cable is connected, assuming *CONFIG:PTT-KEY* is 
> set to *RTS-DTR* in a K3, or *MENU:Serial, 
> USB-PC1* or* USB-PC2 DTR/RTS* is set to *CW* or *PTT* in a K4, to 
> support computer-generated CW and PTT.
>
> To prevent this unwanted radio keying by Windows, while still being 
> able to use computer-generated CW and PTT on these COM port pins, do 
> this for every FTDI port:
>
>  1. Open Windows Device Manager
>  2. Expand *Ports* section
>  3. Right click on Elecraft virtual COM port(s)
>  4. *Properties*
>  5. *Port Settings* tab
>  6. *Advanced* Button
>  7. Make sure *Serial Enumerator* is NOT checked
>  8. Make sure *Disable Modem Ctrl At Startup* /is* checked*/
>  9. Click *OK*
>
> More details with screenshots in this updated presentation linked from 
> my QRZ.COM page <https://www.qrz.com/db/n6tv>:
>
>   * Everything You Need to Know About USB and Serial Interfaces
>     <https://bit.ly/USBserial2021>, updated for 2021
>
> See slides 26, 27, and 28.
>
> I've just updated this presentation (today) with a few new slides 
> showing on how to avoid the same unwanted keying issue when using 
> legacy serial ports like COM1: and COM2: (slides 29 to 33), and one 
> new K4 Menu screenshot (slide 52).
>
> 73,
> Bob, N6TV
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