Does anyone have any good information on rs 232 and 485 protocols as it relates to radio transmission?

I have a job interview with a company tomororw..I have a copy of their user guide for their radio system and it seems to be just like a normal computer network only with radios. I am not that familiar with these protocols...have done a little research on the internet....but would like any info or knowledge that any here can pass to me. As I would really like to get this position and impress their socks off tomorrow in the interview. (it is a very small company and I will be meeting with the vp of sales and marketing. ANy help or info that anyone could provide would be appreciated.