medtan

I have an 8 bed salon with older beds. They are 1996 sundash R32b. The timer used to be controlled by the computer for years but I bought a new computer and since then we have had to start the beds manually...which can be dangerous for us because customers can set their own minutes and so on. We have a compusun intellitan protocol interface.All the beds are wired up correctly but I just can't figure out why it's not communicating right? Is there some software or something I neeed to install on the computer to get it working? I am desperate at this point. Any help will be great thanks