Serial output on TX pin

Projects Programming
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I can see the output I want scrolling by on the serial monitor in IDE, or Termite, via the usb connection.

Stupid question, but does that automatically mean it's being transmitted on the tx pin? Or do I need some other comment to output it there

Context
Arduino nano. Connected to pressure sensor and coded to output the data as nmea sentences using serial.println
I see the tx light flashing every second. Baud 4800 to match the listener device.

I'm making a sensor that passes nmea0183 data to a Raymarine navigation system that uses rs422.

I know serial data outputted by the nano isn't 422 data but I read that you can spoof it by wiring GND and TX to the 422's RX+ and RX-. I tried that and get no evidence of any signal (even a garbage one) from the Arduino, so wanted to check that just cos I see data in the serial monitor it's definitely going out of the tx pin too.

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Welcome to the forum

On the classic Nano the data that is sent to the Serial monitor is also present on the Tx pin (pin 0) on the board.

Note that is not the case on all Arduino boards

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Thanks for the speedy reply.

The one I bought is an ATmega328P nano V3.

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That is the classic Nano. Serial output is on the Tx pin

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On the NANO Board, it is marked as TX1.

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the output is 0-5V. it could translated to RS-232 using an RS-232 driver, RS-485 (half-duplex) or RS-422 (full duplex)

the TX pin would be connected to the data input, Di pin on the driver chip, not the RX+ and RX- pins

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