Thunderbolt Port

i'm having trouble with my thunderbolt port. i have a Zoom TAC-2 Thunderbolt audio interface connected to my MacBook Air (Early 2015) with Sierra. I disconnected it and plugged in a Thunderbolt ethernet in order to use a hard wire instead of wi-fi. When I was finished, i unplugged the ethernet cable and re-plugged in the audio interface. Now it does not show up on my computer. I get no power to the interface. If I replug in the ethernet, it works. Seems like the system is only finding the ethernet and won't recognize the audio interface. Is there any setting or something i can do to reset the port? Any help is greatly appreciated. Thanks, Ben