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I am doing a project about communication between Raspberry and Arduino (by USB cable). I have read several article, some said that this protocol called RS-232, some said its UART. Can anyone tell me that what exactly this protocol is this (connect by USB between Arduino and Raspberry and based on SerialPy Library), I need this to write on my final report. Thank you very much.

Jan Černý
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Mark Truong
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  • I call it `Serial over USB`. – Mark Setchell May 06 '18 at 08:25
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    Possible duplicate of [UART controller or RS232 controller? Is UART a general word?](https://stackoverflow.com/questions/18459505/uart-controller-or-rs232-controller-is-uart-a-general-word) – Alex P. May 06 '18 at 16:44

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On most Arduinos, ist is indeed "serial over USB". Most USB2UART chips implement their own vendor-specific protocol.

It depends on the Arduino which variant is actually used, as it depends entirely on the USB2UART chip.

Turbo J
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