Null Modem DB9 Female to Female Molded 3 ft - Connect two PC serial ports. Use these cable to transfer data between computers. Null Modem serial cables allow two DTE or DCE devices to communicate with no conflict in data transmission. Our null modem cables combine a foil shield construction for EMI/RFI protection from surrounding office equipment and fluorescent lights and PVC jacket for flexibility and reliability. Thumbscrew connectors provide a fast, easy connection every time. Our cables are made with the highest quality materials to ensure the highest level of satisfaction possible on today market.