Hi Don,

I should have given more details -

 * Running linux
 * ftdi drivers are all installed, and the port of /dev/ttyUSB0 is
   installed
 * The Tx lights are flashing on the ftdi adaptor, suggesting it is
   working as expected. I may plug another device in to see if I can
   confirm this (perhaps a null modem of some sort)
 * I did try to swap the RXD and TXD, but this was on a different ftdi
   adaptor - I will try again with this current ftdi device. I will
   also try a different PC when I go in the house (this will give me a
   chance to try Windows instead as well).

Thanks for the comments!

73,
Paul - MW7PAJ

On 30/06/2021 21:32, Don Wilhelm wrote:
Paul,

Is the FTDI adapter identifying as a COM port when it is plugged in?  You can check using Device Manager - open Ports and unplug the adapter - which COM port goes away?  Then plug it back in and observe which COM port is assigned.

Windows no longer adds the FTDI drivers, you must download them from the FTDI website.

Double check your homebrew KXSER cable.  Did you get the RXD and TXD connections right?

All in all, it should work quite nicely.

73,
Don W3FPR

On 6/30/2021 4:14 PM, Paul Jewell wrote:
Good evening,

I am trying to find a wiring layout for the kxusb cable. I have the wiring diagram for the kxser cable (from the amp manual), and have tried using an FTDI adaptor with this layout. Unfortunately the software reports that the KX3 is not responding.

Have any of you gone down this route, and achieved a successful outcome? I have ordered a new cable, but it won't be here for a few days, and this should be a solvable problem with the spares I have in my shack!

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