A specially designed cable that allows a user to connect two computers
directly to each other via their communications ports
(RS-232 ports). Null modems are particularly useful with portable computers
because they enable the portable computer to exchange data with a larger system
. Null modem cables have the Tx (transmit
) and Rx (Recieve
) lines crossed over, thereby allowing data to be sent from one device to the other. They are similar to a crossover cable
where it is the CTS (clear to send
) and RTS (ready to send
) lines are crossed over. Null-modem cables are used for serial port connections.
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