Interfacing mitutoyo gauges with the computer?

I am working on a project where i would have to connect around 6 mitutoyo digimatic indicators to the computer. now I do not know how to go about it. They will basically have a usb input( virtual serial). I tried using matlab but i wasn't able to trigger the gauge. Purchasing a software would be very costly so i was thinking of doing it on my own if possible. Please tell me how i should go about it.