Now that the identity of the protocouplers has been established, I suggest you start a new thread in either the DCC or Electrical sub-forum. I looked at the Tsunami documentation and have questions but have little to do with MTH DCS and much to do with DCC and/or Electrical! I think you'll find a better audience in one of those forums.
BTW, I'd elaborate up front your thoughts on the smoke unit (PS2 unit?) as they have similar hookup issues.