Ethernet, UDP communication with Mettler Toledo balance

Using Arduino Programming Questions
1

Hi all
I need some help with my programming. I'm not totally new to Arduino, but I'm new to Arduino and ethernet communication.

I am trying to communicate with a Mettler Toledo balance using ethernet, UDP. The balance is model XPR 205, and the settings on the balance is as follows:
IP: 123.123.123.123
Subnet: 255.255.255.000
Port: 8001

The arduino is an UNO R3 equipped with a Ethernet Shield 2.

My code is based on the UDPSendRecieveString exampel and is as follows:

#include <SPI.h>
#include <Ethernet.h>
#include <EthernetUdp.h>

// Enter a MAC address and IP address for your controller below.
// The IP address will be dependent on your local network:
byte mac[] = {
   0xA8, 0x61, 0x0A, 0xAE, 0xDE, 0xF9
};
IPAddress ip(123, 123, 123, 124);   // Ip address for arduino
IPAddress remoteIP(123, 123, 123, 123); // Receiver IP address
//byte gateway[] = { XXX, XXX, X, X };                  //set Gateway
//byte subnet[]  = { 255, 255, 255, 0 };                //set Subnetmask


unsigned int localPort = 8001;      // local port to listen on
unsigned int remotePort = 8001; // Remote port to transmit on

// buffers for receiving and sending data
char packetBuffer[UDP_TX_PACKET_MAX_SIZE];  // buffer to hold incoming packet,
//char ReplyBuffer[] = "acknowledged";        // a string to send back

// buffer for sending data
char SendBuffer[] = "S\n"; // a string to send

// An EthernetUDP instance to let us send and receive packets over UDP
EthernetUDP Udp;


// Generally, you should use "unsigned long" for variables that hold time
// The value will quickly become too large for an int to store
unsigned long previousMillis = 0;  // will store last time LED was updated
// constants won't change:
const long interval = 10000;  // interval at which to blink (milliseconds)



void setup() {
  // You can use Ethernet.init(pin) to configure the CS pin
  //Ethernet.init(10);  // Most Arduino shields
  //Ethernet.init(5);   // MKR ETH Shield
  //Ethernet.init(0);   // Teensy 2.0
  //Ethernet.init(20);  // Teensy++ 2.0
  //Ethernet.init(15);  // ESP8266 with Adafruit FeatherWing Ethernet
  //Ethernet.init(33);  // ESP32 with Adafruit FeatherWing Ethernet

  // start the Ethernet
  Ethernet.begin(mac, ip);

  // 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
  }

  // Check for Ethernet hardware present
  if (Ethernet.hardwareStatus() == EthernetNoHardware) {
    Serial.println("Ethernet shield was not found.  Sorry, can't run without hardware. :(");
    while (true) {
      delay(1); // do nothing, no point running without Ethernet hardware
    }
  }
  if (Ethernet.linkStatus() == LinkOFF) {
    Serial.println("Ethernet cable is not connected.");
  }

  // start UDP
  Udp.begin(localPort);
}

void loop() {
  // if there's data available, read a packet
  int packetSize = Udp.parsePacket();
  if (packetSize) {
    Serial.print("Received packet of size ");
    Serial.println(packetSize);
    Serial.print("From ");
    IPAddress remote = Udp.remoteIP();
    for (int i=0; i < 4; i++) {
      Serial.print(remote[i], DEC);
      if (i < 3) {
        Serial.print(".");
      }
    }
    Serial.print(", port ");
    Serial.println(Udp.remotePort());

    // read the packet into packetBuffer
    Udp.read(packetBuffer, UDP_TX_PACKET_MAX_SIZE);
    Serial.println("Contents:");
    Serial.println(packetBuffer);

  }
  delay(10);


//Serial.println(remoteIP);
//Serial.println(remotePort);

// send data to the remote IP address and port
  unsigned long currentMillis = millis();

  if (currentMillis - previousMillis >= interval) {
    // save the last time you did something
    previousMillis = currentMillis;
  
Udp.beginPacket(remoteIP, remotePort);
Udp.write(SendBuffer);
Udp.endPacket();
Serial.println(SendBuffer);


  }
}

The code sends the S\n to the weight and i can see the Serial.println(SendBuffer); in the serial monitor, but I don't seem to get any data from the balance. I have also tried sending s, S or s\n. The ethernet port blinks every 10 seconds to indicate data is being send. I can connect to the balance by USB and send commands with a terminal program, and receive the corresponding data, with no problem.

What is my problem? Do I need to use the subnet address somehow? Is the programming correct in order to receive a string?