[haf-doo-pleks, -dyoo-, hahf-]
of or pertaining to the transmission of information in opposite directions but not simultaneously.
Compare full-duplex.
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Computing Dictionary

half-duplex definition

(hdx, from telegraphy) 1. A type of communication channel using a single circuit which can carry data in either direction but not both directions at once.
Compare: simplex, full-duplex.
2. An obsolete term for local echo.

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
Modems used in the systems operate in a half-duplex mode.
Data transmission can be half-duplex, simulated half-duplex, and full-duplex.
The range of such a communications system is determined by the properties of a modulated-reflector half-duplex link.
The communication channel is half-duplex with no channel turnaround.
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