I'm ok with that info and will look into it. I was wanting to use the skyport to set off my speed light only when out and about. But it looks like I need more equipment to set it off. I assumed using the pop up flash would trigger the speed light but can't figure that one out
You can do anything, one way or another, but post #1 actually raises a lot more questions! You have a Canon 550D and 600EX-RT gun? Some things are clear then, like the 550D doesn't have remote flash mastering control via the pop-up. The obvious solution there is to get either a Canon ST-E3-ET master unit, or the cheaper Yongnuo YN-E3-RT clone
http://www.amazon.co.uk/YONGNUO-YN-...F8&qid=1458083563&sr=8-2&keywords=yn+st+e3+rt (there are other options). That will give you total radio control of the gun as a remote slave. Sorted
When it comes to mixing with the Elinchrom Skyport and D-Lites, I'm not sufficiently familiar with the 600EX-RT, but if it's like all previous Canon guns, a) it doesn't have an optical 'dumb' slave, and will only respond optically to a Canon master flash, and b) if you attach a dumb slave to the gun's hot-shoe, it will fire once, but not again (it needs a special slave unit
http://www.colinsfoto.com/Sonia_Optical_flash_slave/cat43951_47721.aspx ). You'd need to check this out and it might complicate some of the easier workaround solutions.
Without going through all the possible options, this is what I'd do. Get a YN-E3-RT master trigger, and when using with the D-Lites, set them to optical slave and they'll fire off the 600EX-RT (in manual mode). Don't use the Skyport. Or if you want to avoid optical triggering, get a YN E3-RX, one for each head
http://www.amazon.co.uk/YONGNUO-Wir...d=1458083035&sr=1-1&keywords=yongnuo+yn+e3+rx