Requesting pointers to start writing s/w for Digi Neo....

Hello all, Happy holidays and new year.
I am a total novice in this field, however have lots of s/w experience. I have a need to write some s.w to collect data from couple of patient monitors through serial ports. The hospital has Digi Neo 4 port card in a Vista machine and the patient monitors are connected to the card. I have no idea where to start writing a s/w to collect the data from these devices. I do have the specifications from the monitor but how do i get the data from the ports is my first hurdle to cross. Any pointer will be appreciated.

Thanks in advance.