But units with power ports still use command power/data cable between correct? I.e my xp8, blenny, & wave engine le all individually plugged into wall but also all command port daisy chained?
Correct. They still communicate over the command bus, so appropriate cables and terminators are required to make a collective.
Also important to note... I would NOT power Hydros devices that require dedicated power by plugging them in to the XP8/Launch/Start. I have a generic power strip with switched outlets like a lot of people use in this hobby. My WEv2 is plugged in to that along with anything that requires power but is NOT controlled (i.e. lights and other "general" stuff) by Hydros. My XP8 is plugged in to it's own wall outlet, then anything that needs to be controled by Hydros (simple dosers, heaters, AC pumps, etc) gets plugged in there.
In the configuration I saw a few posts up with an X3, Blenny and XP8 ... The Blenny should NOT be plugged in to the XP8 for power. They should each have their own outlet, then daisy chain command bus cables between them with (ideally) a terminator at both ends of the chain.
Does that make sense?