Connect your serial devices, and transfer your files. The SCNM925FM 10ft Cross Wired Serial/Null Modem Cable features one DB9 female and one DB25 male connector, allowing you to connect a 9-pin serial device to a 25-pin serial port, or transfer files from PC-to-PC via a serial connection.Designed to provide a reliable, long-lasting connection, this serial/null modem cable is backed by StarTech.com's lifetime warranty.