#include <SoftwareSerial.h>

#define rxPin 255    
#define txPin 3         
#define inverted 1     

const char clearScreen[ ] = {
  254,1,254,128,0};
const char message[ ] = "Hello World!" ;


SoftwareSerial mySerial =  SoftwareSerial(rxPin, txPin, inverted);

void setup()  {

  digitalWrite(txPin, LOW);   
  pinMode(txPin, OUTPUT);
  mySerial.begin(9600);    
  delay(10);              
  mySerial.print(clearScreen);
  mySerial.print(message);  
}

void loop() {

}