MD23 motor controller

Hello, I bought the MD23 motor controller + EMG30 motors with encoders.

my question is, how to interface with this controller? i have done some research and I think this is the adapter that will let me control the motor controller with the PC:

Also, I will be using an ardiono duemilanove to control later this motor controller, is that possible?

So I want to know if that adapter is OK for what I need, if not, what?