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?