First, I would not use TCP/ip, or the RTI driver if you are having problems. First we need to figure out exactally what kind of problem you are having, and It sounds like this is the first time you are doing this. I assume you uploaded the latest OS to homeworks.

What processor are you using?
Do your keypads work?
What links do you have configured?
What is your baudrate, partiy bit and handshaking set to?
Does your processor have a static ip?
is the processir sending replies?

So here is what I would do:

1. Make sure you can control homeworks