Looking for help hooking up Flex 3000 to JT65 modes

Can anyone point me to a good detailed post or information to hooking up my new to me Flex 3000 to digital modes. I currently am receiving  JT65 fine Just have trouble getting my PTT to work correctly.
I am using WSJT-X and VAC. Do I need to be using the Cat control in addition to PTT?
Again-- I am receiving fine, just not transmitting.

Only options on the Flex for PTT com ports are 1 and 3 (3 appears to be used for something) 
I have set the port on the flex's PTT to com 1 and matched it to WSJT's PTT com 1. Not sure about DTR or RTS-- I think I have tried about every combination and still nothing will key up the flex.

At this time I prefer not to use HRD in the mix of things if not needed.
Again--I have not activated any cat controls

I can take a screen shot and post it here if anyone would like to see what I got going on.

Thank You,

Larry
n7zdr