RAKO Controls WDA-600 controller

These captures were grabbed from a running DreamSourceLabs DSLogic unit.
To generate logic levels the following circuit was used:

         ___
DSI  o--|___|----|<---o----o---------o  LOGIC
                      |    |
                      |    |
                     .-.   |
                     | |   -
                     | |   ^
                     '-'   |
                      |    |
                      |    |
  Ov o----------------o----o---------o  Ov

  Diodes=5V1 Zenner
  Resistors=10K