half duplex

(Computers)	arranged so that the information may be transmitted in both directions, but only in one direction at a time; - of communications channels between computers; contrasted with full duplex(a).
	arranged so that the information transmitted to the remote computer also appears on the local terminal; - of communications channels between computers; contrasted with full duplex(b).

Half Duplex

In telecommunications, a system that allows transmission between two endpoints, but not simultaneously. For example, if two people have walkie talkies, each may speak to the other, but the signal will not transmit if both try to speak at the same time. This contrasts with a full duplex, in which information may be transmitted both ways at the same time.

See HX

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