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Notes:


Serial data transfer can be full duplex or half duplex. Full duplex requires two data lines, one for sending data and one for receiving data. Half duplex requires only one data line. In a half-duplex system, the data line is used for sending the data at certain times and receiving data at other times. In half-duplex data transfer, extra information needs to be sent between the two sender and receiver to coordinate who should send at what time.