Four Port Gateway With Two Inputs

Situation

My venue is using the same DMX universe in two different spaces between two different consoles. How do I configure my gateway so two different spaces can use the same DMX universe without effecting one another? 

Solution Example

1. Configure Port 1 and Port 2 and DMX Universe 1 Input    
2. Configure Port 3 as DMX Universe 2 Output
3. On the console in Space A, patch the space's fixtures in the show. 
4. On the console in Space B, patch the space's fixtures in the show. 
5. The consoles will both output DMX Universe 1, but will not overlap. 

If two different DMX sources give different values to the same DMX address the highest value wins.