Well the first thing you need to do is get hold of the weighbridge documentation to find out how it formats the information it creates, and what interface it offers for connection to the outside world. I doubt that anyone here will be able to guess it for you.
We contacted by a rs232 interface that we purchased, but strictly hangs up the weighing machine when it is plugged in and weigh it slowly. Please try the trucks for coding to be coded by .NET.