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What actually are the DB9, DB25 ports available in our computers?

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What actually are the DB9, DB25 ports available in our computers?

(a) they are connectors used to transfer data either serially or parallelly

(b) they are the RS232 connectors used to connect two incompatible devices

(c) they are the TTL logic connector pins used for communication

(d) they are just data transfer pins used to transfer the data

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I want to ask this question from Serial Port Communication topic in division AVR Microcontroller of Microcontroller

1 Answer

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by (24.2k points)
Right option is (b) they are the RS232 connectors used to connect two incompatible devices

Easiest explanation: DB9 and the DB25 ports are the ports that are based on the RS232 logic that is basically used for communicating two incompatible devices.

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