Is it possible to register the operator and track the driving?
In this case you can define an account related to each operator, that will be transferred on the memory card. When you'll plug the memory card on the weight box, it will ask you the account (username e password) related to that operator; so, every executions of loading and unloading program will be associated to that operator and when you'll import the details of the executions into the DTMTM, you will be able to know which operator has done that particular execution.