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I have an rs232 to TTL converter and I want to read something in the Arduino serial monitor by using the converter instead of using Arduino serial cable. I have connected the correct wiring in my opinion such as tx, Rx, Vcc and GND of the converter to Arduino pin 0 (Rx), pin 1 (Tx), 3.3 V and GND. But when I write something in the serial monitor of Arduino, I am getting nothing. But when I use only the arduino serial cable then I receive what I am writing in the serial monitor. Kindly can anyone tell me what am i doing wrong?

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    did you wire RX to TX? – Juraj Oct 24 at 10:50
  • The Uno works on 5V. Is your TTL converter 5V tolerant? Or why did you wire 3.3V? – chrisl Oct 24 at 12:25
  • Have you disconnected the Arduino's built-in serial connection to the USB interface? – Elliot Alderson Oct 24 at 13:50

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