Got all the switches programmed for TMCC control, but not without some gnashing of teeth and the like!
First off, the switches are somewhat "picky", they don't always pick up the programming on the first try. However, going back a couple of times for the picky ones got them working. I also had to replace two of them as they simply refused to behave.
The bigger issue is, the serial data out of the Legacy LCS SER2 apparently doesn't work for these! I started using that output, and I see the serial data on the output with my 'scope, but the switches totally ignored it! I broke out the DZ-2001L line driver module (good thing I bought it) and connected that up. With that in the picture, all 24 switch machines are now connected.
The $64,000 question is, what's wrong with the data out of the SER2 box? I have it's ground going to the outside rail and the output data going to the DZ-2500 serial data line. The data out of the SER2 is totally ignored no matter what I do. Obviously, I have to accommodate the DZ-2001L in the configuration, very disappointing that the Lionel junk doesn't work right!
To compound the insult with the LCS stuff, which I'm getting less and less impressed with, the three CSM2 boxes have a serial data output that's specifically intended to drive the DZ-2500 switch machines. However, even though I see the data light blinking on those when I send a command from the remote, there is NO data on any of those output lines! Nothing in the manual suggests you have to do anything special to make them output the serial data, so I'm at a loss why they don't work. I'm guessing I'm going to be really disappointed when I try to connect them up to the switch status lines as well, I'm getting the feeling I wasted a lot of money on the LCS crap! 
