[Elecraft] K3 - communication failure after KIO3B upgrade

[Carl Clawson]

Thanks Lyle. I tried those things. If it's a cable problem then I must have
TWO defective cables, because feeding RS232 to the P3 and connecting the
single-headed cable to the K3 also results in no communications to the K3.
And yes, I put the K3 in RS232 mode at 38400 baud when I tried that.

-- Carl

On Sat, Jul 16, 2016 at 5:52 PM, Lyle Johnson <kk7p4dsp at gmail.com> wrote:

> Carl,
>
> A couple of thoughts.
>
> 1) Losing communications with the Y cable plugged into the KIO3B but not
> having BOTH DE-9 connectors attached to the P3 will result in no
> communications.  The KIO3B senses the Y cable and routes the USB side
> communications to the P3 which then routes signals to the K3.
>
> 2) Be sure the cable is fully seated into the jack on the KIO3B. The
> plastic lock should "click" into place.  You can verify this with a gentle
> tug on the cable after it is inserted to verify it is fully seated.
>
> 3) Be sure the P3 is set to 38,400 bps on its serial ports.
>
> 4) If the cable is fully seated and the P3 is set to 38,400 bps and you
> still have the problem, I'd suspect the Y cable being defective.  I don;t
> know if the schematics for the cable are on the website or supplied with
> the cable to assist you in troubleshooting the cable if you so desire, so
> it may require a call to support on Monday, or an email directly to them.
>
> 73,
>
> Lyle KK7P
>
>
> Maybe the combined wisdom of the group will be able to help before I send
>> this to Elecraft support.
>>
>> I installed the KIO3B upgrade in my K3. The USB interface from PC to K3
>> works but only if you don't plug a cable in the RS232/P3 jack. The RS232
>> connection to the P3 isn't happening...
>>
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