It may be showing up as Unknown because, even though it’s in the database, it might not have been in the database when the OH release was built. You’re on 2.3, right? That’s pretty dated at this point (May, I think).
Until you’re running a version of the binding that includes this device, you won’t be able to do anything with it.
There’s a way to switch from an OH release version to a snapshot version, but I don’t know how to do that. There’s also a new release process called milestone builds, which are intended to be a good compromise between full releases and snapshots.
Personally, I run all my OH systems (I have three) on snapshot releases.
As for debug mode, in the karaf console, you would type:
log:set DEBUG org.openhab.binding.zwave
To get out of debug mode, you would type:
log:set INFO org.openhab.binding.zwave
You can read about the Karaf console here.