Precision check weigher

Using Arduino Project Guidance
9

Hi Peter I found a solution
I try to connect my arduino and shield to a serial COM3 and with another serial converter COM4, I monitor the COM4 and I show that the arduino send correctly the string!!!

This code work!

#include <SoftwareSerial.h>
 
//New serial port for my shield
SoftwareSerial Mx3232Serial =  SoftwareSerial(7, 8);
 
//variabile
//char EchoChar = 'A';
char Str1[ ] = "s";

//String Str1 = " s";
//String Str1 = String(' s',HEX);


String Buffer; unsigned long T;

void setup()  {
//pin7(RX) Input
pinMode(7, INPUT);
//pin8(TX) Output
pinMode(8, OUTPUT);

Mx3232Serial.begin(9600);

Serial.begin(9600); 
}
 
void loop() {
//leggo dalla seriale(pin7)
//EchoChar = PortaSeriale.read();
//invio il dato letto
Mx3232Serial.print(Str1);

//Serial.println(Mx3232Serial.read());
 
Buffer = "";
T = millis();

  while (millis() - T < 10)  {         // read all the chars on the serial 
    while (Mx3232Serial.available() > 0) {
      Buffer += char(Mx3232Serial.read());
    }
  }
  
  if (Buffer.length() > 0) {           // transmit to Serial Monitor        
    Serial.print(Buffer);
  }

delay(1000); 

Serial.print(Str1);

}

Now the problem is, how to send the HEX 01 73 string to my weigher and receive the weight?
If with my serial monitor I send this HEX string it work, with arduino NO!

I try to send this

Mx3232Serial.print(0x01,HEX);
Mx3232Serial.print(0x73,HEX);

but dosen't work! Now my question is how to dend in HEX this string?
thanks
Fabio