Colorsource 20 not working in auditorium

im currently at a school auditorium which has an ETC Echo in-wall lighting control system. It works fine but to do our show, we are trying to plug in a Colorsource 20 and override the auditorium but when I plug the board into the DMX INPUT next to the wall box, the lights don’t work. What am I missing?! Thanks so much! 

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