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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