I'm not AM documentation, but my guess is; AM1200=0,1,2 are labeled on your pic as db9 (0,1,2); AM1203=db9 (3-10), and AM1213=0,1,2 db25 (3), db9 (4), db25 (5).
Now if the AM1213 ports are like the AM1013 ports, there are also jumpers to configere the port's function.
One of the first things I...