Data transmission

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What is half duplex data transmission in the serial data transmission

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One way at a time. Half duplex, is like a walkie talkie, not like a phone. A phone is full duplex, as you and I can talk over each other, and neither of us hear what the other is saying. Half duplex is a walkie talkie, were I key to talk, you listen, I stop keying, and you key to talk. Now, we cannot talk over each other.
I hope this helps!

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