It's a point of sale system, in this case a rather high tech cash register. Touch screen, network interface, etc... Unfortunately the existing cable is not expendable (even though I did want so very badly to take it apart). They already have 4 machines, this one is for the 5th. The company says that they only send the cable with the system itself. He never received the cable with his 5th system and the manufacturer is simply being stubborn.