While all the above statements may be true here is my experience... but with a 
KX3 mind you! 
  
I have the model 684 serial 24 key keypad. It is connected to my KX3 through a 
"Y" connection to the serial port on the KX3 (ACC1 if I recall correctly). 
After programming, it has no connection to the computer. I ran the programmer 
program and programmed the keypad on a WIN 7 OS computer and had no problems 
other than learning the macro commands and the KX3 variants. There are no data 
conflicts as the keypad only sends and the other serial device on ACC1 only 
listens.  
  
As an example, if I want to change from PSK31 on 14.070.000 USB at 1.0 watts 
(to drive my HR-50 at 25 wts) to SSB on 40 meters at 10 watts and set the 
filter to 2.5kHz I push one button. I have keys set up for various filter 
widths, band and mode changes, etc. Works for me. Programmer also comes with a 
drawing file that lets you design and print your own key cap legends. 
  
I first heard or saw this keypad a year or so ago when Jean-Francois Menard, 
VA2SS, posted his project. He used the 35 key version. He later published the 
project particulars in an article in QST I believe. He and several others were 
very helpful with macro issues and building the serial cable with the KX3 plug 
on one end. Turns out I was trying to use a damaged length of cable. 
  
PJH, N7PXY 
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