The UVW-1400a uses RS-232 rather than the more common RS-422 used on the Blackmagic Design DeckLink cards. Therefore you will have to use your Keyspan adapter to control your deck rather than the DeckLink cable.
You will also have to go into FCP5 and set it up to use your Keyspan adapter to control your deck.
Be aware that an old, basic deck like that may not support assemble or insert edits. Check your deck manual.