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Crosses the data transmission lines in straight-through serial cables!Convert your existing serial cables into null modem cables with the help of Cables To Go''s Null Modem Adapter. A quick and easy fix for your DTE or DCE incompatibilities, connecting two RS-232 serial ports has never been so easy. Each cable will effectively cross the data transmission lines. With its molded design providing a solid connection, the adapter is fully shielded against outside EMI/RFI interference while giving you the flexibility to meet your connectivity needs.