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After updating the WTIU with the most recent firmware Version 1.3, the WTIU can be connected to the Lionel Legacy Command System.
This connection will require the new WTIU/TMCC-Legacy Command Cable 50-1042, a Lionel SER2 and a Lionel LCS DB9 Cable with Power Supply 6-81499. The USB A end of 50-1042 will plug into the side of the WTIU while the DB9 end will plug into the SER2. Then connect the SER2 to the Legacy Command System using 6-81499. The PDI end of the cable will plug into the SER2 while the DB9 end will plug into the back of the Legacy Command System.