[Elecraft] K3 - Another push-to-talk question

[Doug VE3VS]

I have been enjoying operating my K3 for several months. One of my interests
includes RTTY.

I use the latest MMTTY software (AFSK), have the two audio lines connected,
and use VOX to operate this mode. At the same time, the serial cable from
the computer to the radio remains connected. 

Question - Is there a set-up that will allow the computer to signal PTT
through the serial cable in order to transmit the RTTY tones, rather than
enabling the VOX switch?

Doug, VE3VS

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