Astrotek Null Modem Cable 3m - DB9F/9F 7C 30AWG-Cu Molded type RoHS Grey The ASTROTEK DB9 Null modem cables allowing you to connect a serial device to a 9-pin serial port, or transfer files directly from PC-to-PC via a serial connection. 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. • Null-modem wiring scheme • Fully molded connector and strain relief • DB 9pin male to male