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What is a null modem connection?

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+1 vote
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in Microcontroller by (14.6k points)
What is a null modem connection?

(a) no data transmission

(b) no MAX232

(c) the RxD of one is the TxD for the other

(d) no serial communication

I have been asked this question in an international level competition.

This interesting question is from Serial Port Communication in chapter 8051 Microcontroller of Microcontroller

1 Answer

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by (24.2k points)
The correct option is (c) the RxD of one is the TxD for the other

To explain I would say: In null modem connection the RxD of one is the TxD for the other.

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