Half duplex

Updated: 10/11/2017 by Computer Hope
Two red street signs, one pointing right and one pointing left.

Signals that flow in both directions, but only one way at a time. In microcomputer communications, half duplex or HDX refers to an online local echo that causes a Modem to send a copy of transmitted data to the sending computer screen.

Duplex, Echoplex, Full duplex, Hardware terms