There are three different types of data communication modes :
(i) Simplex : A simplex communication mode permits data to flow in only one direction. A terminal connected to such a line is either a send-only or a receive only device. Simplex mode is seldom used because a return path is generally needed to send acknowledgements, control or error signals.
(ii) Half duplex : Under this mode, data can be transmitted back and forth between
two stations, but data can only go in one of the two directions at any given point of point.
(iii) Full duplex : A full duplex connection can simultaneously transmit and receive data between two stations. It is most commonly used communication mode. A full duplex line is faster, since it avoids the delay that occur in a half-duplex mode each time the direction of transmission is changed.
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