For Null modem cable we have terms and definitions in 2 topics. The topics are Computer Virus and UPS.

A cable that enables two computers to communicate without using modems. A null modem cable accomplishes this by crossing the sending and receiving wires, so that the wire used for transmitting by one device is used for receiving by the other, and vice versa.
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A special cable for connecting two RS-232 ports or devices directly, in place of a modem connection.
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