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What is the use of the RTSin pin on the Adafruit FONA 3G+GPS Breakout?

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What is the use of the RTSin pin on the  Adafruit FONA 3G+GPS Breakout?

(a) Right Turn Pin

(b) Hardware Control Pin

(c) Software Control Pin

(d) Residue Transmitter Pin

The question was asked during an internship interview.

I want to ask this question from Adafruit FONA 3G+GPS Breakout in division Interfacing of Sensors, Actuators, and Other Modules of Arduino

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Correct choice is (b) Hardware Control Pin

Explanation: The  Adafruit FONA 3G+GPS Breakout has the RTSin pin to control flow of transfer from the board to the micro-controller connected to it, and vice versa. The user can decide to either turn ON the flow or turn OFF the flow.

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