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Beauty of using the built-in UART and built-in USB interface on an Arduino NANO is
that you don't have to mess with voltage level conversion between RS-232 and TTL.
This is also convenient because many modern PC do not have built-in RS-232 ports.
The Arduino Pro-Mini is an alternative to the NANO that does not include the USB
interface. With this board you only need to do the voltage level conversion in order
to use it with your RS232 PC port.
On Tue, Apr 10, 2018 at 9:57 AM, Jerry Gaffke via Groups.Io <jgaffke@...> wrote:
The Arduino already does UART, digital pins 0 and 1 get tied to the CH340 usb chip on the Nano.