[Elecraft] K3 & DM 780

[goldtr8 at charter.net]

I want to use DM 780 with my K3 to work either CW or one of the data 
modes.

I can get the DM 780 to decode signals, but if I try to TX, I am unable 
to trigger the radio to do anything.

I have both a USB to serial connection, plus the sound card from the 
laptop connected.  I have been reading the manual and a starter guide 
someone sent me, but I am getting nowhere fast.  I did try different 
settings for the PPT--KEY under the config menu, and I did get a solid 
tone out of the monitor speakers but no TX.

If someone can point me to a resource on the intranet, I will glady do 
some more reading.

Thx  Happy New Year
Don
KD8NNU