Currently as is described in other threads, the MTH TIU connects to a Lionel LCS SER2 Module with an MTH supplied cable. The SER2 then is connected to the serial port on the Base2 with the LCS DB9 cable with power supply(6-81499). The Base3 appears to not have a serial port. The Base3 has 3 PDI connectors for LCS connection. Do the PDI ports on Base3 supply power for the SER2 and other LCS modules?
Mike