Null Modem DB9 Female / Female Molded 6ft Crossover Data Null Modem serial cables allow two DTE or DCE devices to communicate with no conflict in data transmission. Cable Connection standard null modem cables use the modem-to-terminal pin out that supports both hardware and software handshaking. Transmit and receive signals are crossed to ensure proper data transmission. These high-quality Null Modem cables can deliver the data quickly and reliably over short distances. Available in a wide array of stock lengths and gender combinations