Can you communicate with the K3 using a simple terminal server? E.g., send 
“FA;” and see if you get the VFO A frequency in response.

That would demonstrate that the port and driver are working. 

Wayne



----
http://www.elecraft.com

> On May 30, 2018, at 4:48 PM, Mark Wheeler <[email protected]> wrote:
> 
> Wayne,
> 
> Yes, I confirmed the USB port does function with my external DVD-ROM drive. I 
> reinstalled my RT Systems software for my Icom IC-5100A. It worked without a 
> hitch.
> 
> Mark
> WU6R 
> 
>> On May 28, 2018, at 7:25 PM, Wayne Burdick <[email protected]> wrote:
>> 
>> Not so sure. For example, see:
>> 
>>   
>> https://www.windows10forums.com/threads/com-ports-since-last-april-update-faulty.16976/
>> 
>> If I find anything more relevant I’ll let you know.
>> 
>> Meanwhile, can you confirm that your PC’s COM ports still work with other 
>> devices, and that the K3/P3 still work with the previous OS?
>> 
>> 73,
>> Wayne
>> N6KR
>> 
>> 
>>> On May 28, 2018, at 4:12 AM, Mark Wheeler <[email protected]> wrote:
>>> 
>>> Wayne,
>>> 
>>> There were tons of problems listed associated with the latest windows 10 
>>> update, but none were COM port issues.  The search for a solution 
>>> continues...  Thanks.
>>> 
>>> Mark
>>> WU6R
>>> 
>>>> On May 27, 2018, at 06:43 AM, Wayne Burdick <[email protected]> wrote:
>>>> 
>>>> Try this:
>>>> 
>>>> https://www.ghacks.net/2018/05/01/all-the-issues-of-windows-10-version-1803-you-may-run-into/
>>>> 
>>>> Wayne
>>>> 
>>>> 
>>>>> On May 27, 2018, at 7:29 AM, Mark Wheeler <[email protected]> wrote:
>>>>> 
>>>>> With the latest Windows 10 update earlier this week, my K3S and P3 can no 
>>>>> longer communicate with my Windows 10 PC via the USB cables. I’ve gone 
>>>>> into Device Manager and right clicked on the COM12 device drive and 
>>>>> clicked “update driver” and that updated from a 2016 driver to a 2017 CM 
>>>>> port driver, but neither connect the PC to my K3S or P3. Any suggestions? 
>>>>> Thank you.
>>>>> 
>>>>> Mark
>>>>> WU6R
>>>>> (formally KM6HFR)
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