Sync tempo to rc-505 loopstation

Im usling cubase 7 and boss re-505 loopstation. I Want cubase to be the slave to the tempo of the rc 505. But i cant make it World.
Im connecting the two thru USB connection.
Im triggering cubase/halion 5 with midinotes from a midikeyboard.
Everything workes fine except the tempo doesnt syncronize.