Department of Computer Scien

ce and Information Engineering

National Cheng Kung University

HANEL

BASICS OF SERIAL COMMUNICA-TIONHalf- and Full-Duplex Transmission

‰If data can be transmitted and received, it is a

duplex

transmission

¾If data transmitted one way a time, it is referred to as

half duplex

¾If data can go both ways at a time, it is

full

duplex

‰This is contrast to

simplex

transmission

Transmitter

Simplex

Receiver

Transmitter

Transmitter

Receiver

Receiver

Half DuplexFull Duplex

Transmitter

Transmitter

Receiver

Receiver