dmx not working

I am having some problems with some Altman Pars not listening to DMX signal, and I can't seem to figure out what is causing it. I am using Altman Cycs, Source Four Lustrs, and VL1100s as well, but none of them are showing the same issue. The pars will start strobing and changing colors seemingly...

Hello All! First time post. I've adopted this awesome board at a local HS and I'm learning. I've searched for a solution for days, phoned a friend, and searched the forums, but I've still got nothing. Any help would be greatly appreciated!Console: ETC Element 500 channels. One DMX cable output...