This is different from the "Renard" world, where each controller "eats" the channels it uses and only passes on the rest.
In normal DMX land (and in fact, LOR, AL and other protocols), the entire signal, from channel 1 to 512, is sent to every controller. Each controller has an address that it listens to, and just uses that portion of the signal to control it's assigned lights/function.
So be sure that if you use a Renard controller, that it has a "pass-thru" port where it sends all the signal to the next controller, or use a splitter to send the entire signal to each controller/device. This will allow two or more controllers to listen to the same channel and not effect each other.