[Elecraft] A computer control question

[W3FPR]

Dave,

Be aware that the 9 pin connector on the K2 does (should) contain the 
RTS and DTR signals.
That connector is NOT an RS232 connector - it is labeled AUX IO for that 
reason.
Connecting the full set of RS232 signals to that connector can damage 
the K2.
It contains internal K2 signals for control of external Elecraft devices 
like the KAT100.

See the KIO2 or KPA100 manual for the special cable that is to be used 
on this connector and note that it should only connect the TXD, RXD and 
signal GND to the computer - the other pins are for internal K2 signalling.

73,
Don W3FPR

On 12/19/2025 11:03 AM, Dave Sublette via Elecraft wrote:
> I use my K2 with a Mac Mini 64 bit ARM compatible computer.  I run the
> MacLoggerDX logging program. The computer interfaces with the K2.  It reads
> the frequency and changes modes, etc.  The control seems to be working
> except when I want to send CW from the keyboard.  I have varied the RTS/DTR
> and PTT options every way I can think of but still cannot get the computer
> to send CW through the K2.  If anyone has a similar setup that works,
> please let me know.  We can take this off the discussion list if necessary.
>
>