[Elecraft] k3 and RTTY hookup question

[km5ps]

I have my k3 running well with N1MM and MMTTY thru com1, but frequency 
will not track because mmtty uses com 1 for control of rig.  What is the 
best way to have the K3 track the  frequency and mmtty control of the 
k3?  Is it to use the 15 pin plug on the back of the rig?  Not really a 
big deal unless you are in S&P mode and click on a multiplier from list 
and rig does not go to the frequency, just would be nice though.

TIA
John