Question

If the data transmission takes place in either direction, but at a time data may be transmitted only in one direction then, it is of

(a) simplex mode

(b) duplex mode

(c) semi duplex mode

(d) half duplex mode

I got this question during a job interview.

I would like to ask this question from Programmable Communication Interface 8251 USART in section Special Purpose Programmable Peripheral devices and their Interfacing of Microprocessor

Answer 1

Correct option is (d) half duplex mode

To explain: In half duplex mode, data transmission is bidirectional but not at a time. For example, Walkie-Talkie.