1m DB9 RS232 Serial Null Modem Cable FM The SCNM9FM1MBK 1m DB9 Null Modem Cable features one DB9 male and one DB9 female connector, 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. Designed to provide a reliable, long-lasting connection, this RS232 null modem cable is backed by StarTech. com's lifetime warranty.