In your compound you can use the DMX * Out modules to send control to a selected device. If you open the dropdown list of their Device property the available ArtNet nodes on your network will be populated automatically.
Here you also have to choose a specific Channel within a Net/Subnet/Universe.
You have to send scalar values between 0 and 1 into the Value property.
By default these are converted into a 8-bit value (0 - 255) and sent to the specified DMX channel. But some devices expect 16-bit values (0 - 65535) layed out into two consecutive DMX channels. For these select a 16-bit Mode, either Big or Little Endian as expected by the device.
By using DMX Array Output module you can also describe a structure of several input data occupying a number of consecutive channels. Each data can be either 8bit or 16bit:
In this case Channel designates the first channel where the data structure begins.
There is also a helper module for sending RGB color data with an optional W component. called DMX Color Output. Components can be either 8 or 16bit: