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I am trying to read data from RS232 Shield with an Arduino Mega.

This is the schematic pin, TX is 3 and RX is 2.

Wiring: PC > USB-RS232 cable > Arduino RS232 Shield.

From Arduino, I can transmit data to RS232, the TX led blink and I got the value at PC. From PC, I send the data, the RX led blink but nothing is showed in Arduino Monitor.

#include <SoftwareSerial.h>

SoftwareSerial mySerial(2, 3); // RX, TX

void setup() {
  // Open serial communications and wait for port to open:
  Serial.begin(9600);
  while (!Serial) {
    ; // wait for serial port to connect. Needed for native USB port only
  }


  Serial.println("Goodnight moon!");

  // set the data rate for the SoftwareSerial port
  mySerial.begin(9600);
  mySerial.println("Hello, world?");
}

void loop() { // run over and over
  if (mySerial.available()) {
    Serial.write(mySerial.read());
  }
  if (Serial.available()) {
    mySerial.write(Serial.read());
  }
}

I also tried to move RX and TX to Pin 15 and 14 but worked as the same as before.

I am trying to read data from RS232 Shield with an Arduino Mega.

This is the schematic pin, TX is 3 and RX is 2.

Wiring: PC > USB-RS232 cable > Arduino RS232 Shield. Software to send/receive data: Hercules Setup Utility

From Arduino, I can transmit data to RS232, the TX led blink and I got the value at PC. From PC, I send the data, the RX led blink but nothing is showed in Arduino Monitor.

#include <SoftwareSerial.h>

SoftwareSerial mySerial(2, 3); // RX, TX

void setup() {
  // Open serial communications and wait for port to open:
  Serial.begin(9600);
  while (!Serial) {
    ; // wait for serial port to connect. Needed for native USB port only
  }


  Serial.println("Goodnight moon!");

  // set the data rate for the SoftwareSerial port
  mySerial.begin(9600);
  mySerial.println("Hello, world?");
}

void loop() { // run over and over
  if (mySerial.available()) {
    Serial.write(mySerial.read());
  }
  if (Serial.available()) {
    mySerial.write(Serial.read());
  }
}

I also tried to move RX and TX to Pin 15 and 14 but worked as the same as before.

I am trying to read data from RS232 Shield with an Arduino Mega.

This is the schematic pin, TX is 3 and RX is 2.

From Arduino, I can transmit data to RS232, the TX led blink and I got the value at PC. From PC, I send the data, the RX led blink but nothing is showed in Arduino Monitor.

#include <SoftwareSerial.h>

SoftwareSerial mySerial(2, 3); // RX, TX

void setup() {
  // Open serial communications and wait for port to open:
  Serial.begin(9600);
  while (!Serial) {
    ; // wait for serial port to connect. Needed for native USB port only
  }

  
    pinMode(5, OUTPUT);             //Set RS485 direction pin as output
    digitalWrite(5, LOW);    


  Serial.println("Goodnight moon!");

  // set the data rate for the SoftwareSerial port
  mySerial.begin(9600);
  mySerial.println("Hello, world?");
}

void loop() { // run over and over
  if (mySerial.available()) {
    Serial.write(mySerial.read());
  }
  if (Serial.available()) {
    mySerial.write(Serial.read());
  }
}

I also tried to move RX and TX to Pin 15 and 14 but worked as the same as before.

I am trying to read data from RS232 Shield with an Arduino Mega.

This is the schematic pin, TX is 3 and RX is 2.

Wiring: PC > USB-RS232 cable > Arduino RS232 Shield.

From Arduino, I can transmit data to RS232, the TX led blink and I got the value at PC. From PC, I send the data, the RX led blink but nothing is showed in Arduino Monitor.

#include <SoftwareSerial.h>

SoftwareSerial mySerial(2, 3); // RX, TX

void setup() {
  // Open serial communications and wait for port to open:
  Serial.begin(9600);
  while (!Serial) {
    ; // wait for serial port to connect. Needed for native USB port only
  }


  Serial.println("Goodnight moon!");

  // set the data rate for the SoftwareSerial port
  mySerial.begin(9600);
  mySerial.println("Hello, world?");
}

void loop() { // run over and over
  if (mySerial.available()) {
    Serial.write(mySerial.read());
  }
  if (Serial.available()) {
    mySerial.write(Serial.read());
  }
}

I also tried to move RX and TX to Pin 15 and 14 but worked as the same as before.

I am trying to read data from RS232 Shield with an Arduino Mega.

This is the schematic pin, TX is 3 and RX is 2.

From Arduino, I can transmit data to RS232, the TX led blink and I got the value at PC. From PC, I send the data, the RX led blink but nothing is showed in Arduino Monitor.

#include <SoftwareSerial.h>

SoftwareSerial mySerial(2, 3); // RX, TX

void setup() {
  // Open serial communications and wait for port to open:
  Serial.begin(9600);
  while (!Serial) {
    ; // wait for serial port to connect. Needed for native USB port only
  }

  
    pinMode(5, OUTPUT);             //Set RS232 direction pin as output
    digitalWrite(5, LOW);    


  Serial.println("Goodnight moon!");

  // set the data rate for the SoftwareSerial port
  mySerial.begin(9600);
  mySerial.println("Hello, world?");
}

void loop() { // run over and over
  if (mySerial.available()) {
    Serial.write(mySerial.read());
  }
  if (Serial.available()) {
    mySerial.write(Serial.read());
  }
}

I also tried to move RX and TX to Pin 15 and 14 but worked as the same as before.

I am trying to read data from RS232 Shield with an Arduino Mega.

This is the schematic pin, TX is 3 and RX is 2.

From Arduino, I can transmit data to RS232, the TX led blink and I got the value at PC. From PC, I send the data, the RX led blink but nothing is showed in Arduino Monitor.

#include <SoftwareSerial.h>

SoftwareSerial mySerial(2, 3); // RX, TX

void setup() {
  // Open serial communications and wait for port to open:
  Serial.begin(9600);
  while (!Serial) {
    ; // wait for serial port to connect. Needed for native USB port only
  }

  
    pinMode(5, OUTPUT);             //Set RS485 direction pin as output
    digitalWrite(5, LOW);    


  Serial.println("Goodnight moon!");

  // set the data rate for the SoftwareSerial port
  mySerial.begin(9600);
  mySerial.println("Hello, world?");
}

void loop() { // run over and over
  if (mySerial.available()) {
    Serial.write(mySerial.read());
  }
  if (Serial.available()) {
    mySerial.write(Serial.read());
  }
}

I also tried to move RX and TX to Pin 15 and 14 but worked as the same as before.