Connecting a KXUSB to the K2 RS232

[Elecraft mailing list]

All,
During the past weekend I pulled my faithful K2 out for the EUHFContest.
I found a RS232 to USB cable locally, but it does not connect. Is there a way I can check if the chip works correctly?

I have a couple of KXUSB on hand. Is there any reason that I can not or should not connect the KXSUB Tip to Pin 3, the Ring to the Pin 2 and the Sleeve to Pin 5 of the DB9F connector (from the K2)?
I should then be able to key and control the K2 from N1MM logger, as I do my KX3.

By the way, the K2 CW sound beats all, my KX3 included.

Thanks 73
Hans Jørgen (Joe)
OZ7BQ

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[Don Wilhelm]

Hans,

Do not connect a standard serial cable or a USB to serial adapter to the
K2 AUX IO connector - keep in mind that it is not labeled "RS-232" for a
reason.

Yes, you can make an adapter to connect the KXUSB to the K2.  A 3.5mm
jack and a DE9 male connector as well as 3 wires are needed.
Connect the KXUSB tip to the DE9 pin 3, the ring to pin 2 and the Sleeve
to pin 5.


If you have the QRP K2 and want to really be 'clever', you could mount
the jack on the rear panel of the QRP top and wire to the back side of
the DE9 connector pins on the KIO2.  If you have the KPA100, there is no
room on the rear panel and you will have to build the external adapter.

73,
Don W3FPR

On 8/6/2018 10:35 AM, Hans J Rasmusen via Elecraft wrote:
> All,
> During the past weekend I pulled my faithful K2 out for the EUHFContest.
> I found a RS232 to USB cable locally, but it does not connect. Is there a way I can check if the chip works correctly?
>
> I have a couple of KXUSB on hand. Is there any reason that I can not or should not connect the KXSUB Tip to Pin 3, the Ring to the Pin 2 and the Sleeve to Pin 5 of the DB9F connector (from the K2)?
> I should then be able to key and control the K2 from N1MM logger, as I do my KX3.
>
> By the way, the K2 CW sound beats all, my KX3 included.
>

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[Don Wilhelm]

Hans,

Does the USB to RS-232 cable have an FTDI chipset?  I know that works OK
with the K2 (at least the one used in the KUSB).  Others fail with the
slow 4800 baud rate required by the K2.  I have had good success with my
Edgeport serial converter as well.  A Prolific chipset adapter may or
may not work.

You still need to build a cable having only 3 conductors to isolate the
non RS-232 pins from the serial port, even though it may be short.  The
AUX IO to PC cable is shown in the KIO2 and the KPA100 manual.

73,
Don W3FPR

On 8/6/2018 10:35 AM, Hans J Rasmusen via Elecraft wrote:

> All,
> During the past weekend I pulled my faithful K2 out for the EUHFContest.
> I found a RS232 to USB cable locally, but it does not connect. Is there a way I can check if the chip works correctly?
>
> I have a couple of KXUSB on hand. Is there any reason that I can not or should not connect the KXSUB Tip to Pin 3, the Ring to the Pin 2 and the Sleeve to Pin 5 of the DB9F connector (from the K2)?
> I should then be able to key and control the K2 from N1MM logger, as I do my KX3.
>
> By the way, the K2 CW sound beats all, my KX3 included.
>
> Thanks 73
> Hans Jørgen (Joe)
> OZ7BQ
>
> Sendt fra min iPhone
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]
>

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