If you are only going to use TMCC commands and not Legacy, then you don't even need a SER2. You can connect directly to the Base-1's DB9 serial port. In fact, I don't think it would work if you went through a SER2. If you did I don't think the Base-1 would be able to recognize the commands. As far as I know the Base-1 can only recognize native TMCC commands, and that would not be what it would be receiving if you went through a SER2. I don't think any LCS module would work with the Base-1. Rudy can confirn that.
If you have a hard copy of the TMCC manual, then you have everything you need. If you prefer an online copy you can search for it on Lionel's site under "Support". I don't think the manual has ever changed though.