As Gerry said, the ribbon cable which comes with the UC400 can be plugged in directly to that BOB on the bottom right. It has a DB25 connector, so it is pretty simple. Your "electronic box" (I am not laughing) has a lot of space and is made out of user friendly material (meaning MDF or something similar), so you could just fix the UC400 beside the BOB with four screws. All you need is a power supply connection. I don't know if the UC400 requires 5, 12 or 24 volt, but that's easily fixed, even if you have to use a phone charger or something similar.