#include <SoftwareSerial.h>

SoftwareSerial RS485Serial(2, 3); // RX, TX

void setup() {
  pinMode(4, OUTPUT); // Control the DE/RE pin
  digitalWrite(4, LOW); // Set to receive mode
  RS485Serial.begin(9600);
  Serial.begin(9600);
}

void loop() {
  if (RS485Serial.available()) {
    String message = RS485Serial.readString();
    Serial.println("Received: " + message);
  }
}