Byron,

The way you have it connected now, you have to use two "COM" ports, one for the K3S and another for the P3. It would be better to use only one.

Since you have a USB to serial adapter working with the P3, I suggest you remove the USB cable (unless you are using the internal K3S soundcard), and connect the K3S and P3 with the E980297 cable as shown on page 19 of the manual. You would then change the RS232 menu entry to the baud rate being used by your software application (use 38,400 if possible).
I believe that is a better 'workaround' than you are now using.

My guess is that you may have a defective CBLP3Y.

You can still use the audio path provided by the USB audio section if desired.

If by 'Data Terminal Mode' you are referring to displaying the K3S decode of CW and DATA on the P3 - that is not displayed on the P3 screen, but with the SVGA option in the P3, it can be displayed on the attached SVGA screen - see the SVGA option manual.

73,
Don W3FPR

On 9/26/2015 4:32 PM, Byron Peebles wrote:
I found a workaround by using the Elecraft RJ-45-to-Serial cable and a separate PC-to-P3 USB-to-serial. I am uncertain how to test the RJ-45-to-Serial cable, but at least it no longer "breaks" my K3S to PC USB.

Data Terminal Mode in the P3 seems like a secret, but I'm hunting for it now. 73, Byron


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