Dmx is a protocol to transmit 512 channels of 8 bit data over serial ports. Every 8 bit channel can transmit a value between 0 and 255.
There is no 'format', like dmx isn't stored in a .mov file and transported or something.
When you use art-net, you are adding another protocol to the mix.
Art-net takes all your 8 bit dmx data, packages it in artnet data packets, to be able to send this data to clients (nodes) over a network using UTP cables or even wi-fi.
If you can't get art-net out of touchdesigner, i would go to the Deriviative forum and ask the community there what's missing on your patch
