[Elecraft] Question on ACC plug for KX2

[Matthew Kaufman]

I believe that sleeve is ground, ring is TxD, and tip is RxD.  Wayne or someone else will correct me if I'm wrong, I hope.

73

-- Matt N3AR

> On Feb 7, 2026, at 2:56 AM, Stefan Jansen via Elecraft <elecraft at mailman.qth.net> wrote:
> 
> Hi Wayne,
> 
> Maybe you remember me, we had a talk at the Ham Radio Friedrichshafen in 2025 and I asked you about the morse UI for the KH1.
> 
> Now I would like to come back with another question about the USB cable for Elecraft KX2/KX3/KH1. I would like to know how the RS232 signals are mapped onto the 3.5mm plug. I know that RxD and TxD are on the tip and first ring. Which one is what, and is TxD and RxD from the computer’s perspective or from the transceiver’s?
> 
> Sorry for asking, but I couldn’t find out this in text form in any documentation.
> 
> 
> Vy 73 de Stefan, DK7STJ
> 
> --
> Stefan Jansen    ***    E-Mail: DK7STJ at darc.de
> 
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