Interfacing with 2 K8097 stepper motor board cards

I am writing a program in VB 2015 that interface with the 2 stepper motor boards. The problem I am getting is that if I connect to only one board the program works 100% and the motor works as it is suppose to do and if I connect to the other board it works 100%. But if I initialize the boards in sequence I can only communicate with the last initialized board. Iv’e writen separate classes that is suppose to handle each boards code independantly, but it looks like I can only have on SMC class in a project at a time and not in my case where I need to have two separate independant Velleman SMC classes. Is it possible to do ?

Summarized: I want to communicate with 2 boards over two serial ports from one VB application. Is this possible with the DLL Supplied.

Thanx.