a code to know from where the input came?

So I have a computer that I've connected multiple balances on it, each balance on a COM, and each time I print the weight on the balance it appears on excel as a value only, but now I want to add a code to verify from where each reading came from.



I use the macro code to add Time&Date stamp for each reading, but now I need to verify the source, maybe using an if the command that if the reading came from COM3 for example excel will write Balance 1

Hmmmm
I use USB B to A cable to connect the balance to the PC, inside device manager is shown as USB interface device under Human interface devices