[Elecraft] KX3 stopped answering to serial commands

[iain macdonnell - N6ML]

On Mon, Sep 5, 2016 at 11:18 AM, Holger Schurig <holgerschurig at gmail.com> wrote:
> I have a KX3 with Firmware 02.33. When I put the orginal Elecraft USB->ACC1
> Plug into the device, then programs like kx3util, fldigi, rigctl (from
> hamlib) and even a terminal won't work.
>
> Actually, this is not totally true. When I turn AUTO INF to "riG Ctrl" in
> the menu, then I see various frequency change settings. So I know that the
> KX3 can send and my computer can receive. And that the baudrate is correct.
>
> Also, when I enter "ID;" in a terminal program, I will get the echo "ID;",
> but not the response "IDnnn;". When I remove the plug from AC1, I won't get
> the echo. So I think the "ID;" is really sent from the KX3, so somehow the
> KX3 can still receive and echo. It just doesn't honor any commands.

It almost sounds like the TX and RX lines might be shorted together??
But if this only happens when the cable is connect to the KX3, perhaps
the short is inside. When you type "ID;", does it echo back one
character at a time, or the whole thing at once? If you send something
arbitrary/random, does that get echoed back too?

73,

    ~iain / N6ML