ESP8266 - RS232 reading Issue

Projects Interfacing w/ Software on the Computer
1

Hi, i've a ESP8266 with RS232 connected to RX - TX.

I need to get data from the RS232 Serial every X seconds,
but here a strange issue, sometimes it display datas, when I plug / unplug the Arduino to my Macbook it stops to display Serial data...

void setup() {
  Serial.end();
  Serial.begin(9600);
}

void loop() {
  
  
  unsigned long currentMillis = millis();
  if (currentMillis - lastRequestTime >= requestInterval) {
    
    if (Serial.available()) {
      String data = Serial.readStringUntil('\n'); 
      Serial.println(data);
    
    }
    lastRequestTime = currentMillis;
  }
}
2

Moved to Interfacing w/ Software on the Computer.... Please don't post in Uncategorised again.

3

ok thanks

4

True RS-232 signals are inverted UART signals at high bipolar voltage levels. What do you mean by "RS232"?

5
6

Where? Serial Monitor? Other terminal program?
If serial monitor, which version of the IDE?

I assume that you mean unplug/plug. It's possible that the file handle that points to the serial port becomes invalid after unplugging. If so, close the connection and open it again might do the trick.

7

In Serial Monitor, i noticed that by adding Serial.swap(15); it seems to work, but now I've the Serial Monitor full of Serial Data even if I comment Serial.println(data); and no other Serial.println is displayed

8

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