which I got from here: http://emanual.robotis.com/docs/en/dxl/protocol2/
Then I am reversing the dual buffer direction about 500us after and waiting for a response and not seeing anything on the scope.
My question is, am I sending the correct bit stream? Is there something else I am missing first?
found the problem, the dynamixel I had was programmed for a different baud rate and ID. I ordered the R2D2 dongle and used the R+ Manager software to change it and now I can communicate with it, I see receive data coming back over my UART interface now.