Null-Modem Cable

What Does Null-Modem Cable Mean?

A null-modem cable is a type of specialized cable that allows users to eliminate traditional device-linking systems (such as a modem). With a null-modem cable, users can link two computers to enable direct communication through serial port connections.


A null-modem cable is also known as a crossover cable.

Techopedia Explains Null-Modem Cable

Typically, null-modem cables utilize RS-232 communications ports for transmission and receipt. Use of these cables may require handshake authentication. Null-modem cables are often used for localized gaming, where two computers are in proximity, or for linking a specific computer to a greater hardware system. The basic idea of using null-modem cables is that those who are paying for hardware setups can eliminate the purchase of connecting devices or more costly solutions just by using one of these crossover cables.


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Margaret Rouse
Technology Expert

Margaret is an award-winning technical writer and teacher known for her ability to explain complex technical subjects to a non-technical business audience. Over the past twenty years, her IT definitions have been published by Que in an encyclopedia of technology terms and cited in articles by the New York Times, Time Magazine, USA Today, ZDNet, PC Magazine, and Discovery Magazine. She joined Techopedia in 2011. Margaret's idea of a fun day is helping IT and business professionals learn to speak each other’s highly specialized languages.