Question

What does RI handshaking signal refer to according to the RS232 logic?

(a) if this logic is high then a receive interrupt is generated

(b) this pin is high during transmission

(c) this pin is high during a reception in order to tell that the device is busy at this particular time

(d) none of the mentioned

This question was addressed to me by my school teacher while I was bunking the class.

The doubt is from Serial Port Communication topic in section AVR Microcontroller of Microcontroller

Answer 1

Correct option is (c) this pin is high during a reception in order to tell that the device is busy at this particular time

Explanation: RI pin of the RS232 logic tells us about the ring indicator i.e it sends a busy signal if the device is currently receiving any data.