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What are the parameters that are default values?

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What are the parameters that are default values?

(a) Port_Name and Bits

(b) Speed and Port_Names

(c) Speed and Parity

(d) Stop bit and Flow Control

This question was addressed to me by my college professor while I was bunking the class.

Origin of the question is Rasberry Pi topic in portion Prototyping Embedded Devices of IOT

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Right option is (b) Speed and Port_Names

For explanation: Port_Name: Linux automatically assigns different names for different types of serial connectors. For Standard Serial Port: ttyS0 … ttySn

USB Serial Port Adapter: ttyUSB0 … ttyUSBn

Speed: 115200.

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