Our line of null modem serial cables allows two DTE or DCE devices to communicate with no conflict in data transmission. The transmit and receive signals are crossed to ensure proper data transmission. Each null modem cable is designed with a rugged overmolded construction that provides added strain relief and a solid connection each time. Plus the cable is foil shielded for EMI/RFI protection from surrounding office equipment and flourescent lights. Thumbscrew connectors provide a fast easy connection every time.