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The purpose of a null-modem cable is to permit two RS-232 "DTE" devices to communicate with each other without modems or other communication devices (i.e., "DCE"s) between them.
high quality 6 Foot RS-232 Null Modem Cables (Cross) 9 Pin Female to Female. These null modem cables can be used to transfer data between 2 serial ports, such as 2 PC's, or a a PC and a FTA Satellite Receivers