Чтение последовательного ввода Arduino

Я считываю ввод со своих весов Ohaus, используя его вывод RS232, используя этот код:

#define HWSERIAL Serial1

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

void loop() {
  int incomingByte;

  if (Serial.available() > 0) {
    incomingByte = Serial.read();
    Serial.print("USB received: ");
    Serial.println(incomingByte, DEC);
    //HWSERIAL.print("USB received:");
    //HWSERIAL.println(incomingByte, DEC);
  }
  if (HWSERIAL.available() > 0) {
    incomingByte = HWSERIAL.read();
    Serial.print("UART received: ");
    Serial.println(incomingByte);
    //HWSERIAL.print("UART received:");
    //HWSERIAL.println(incomingByte);
  }
}

Нажимая кнопку печати на весах, я ожидал, что данные будут приходить одним пакетом только с показаниями, но я получаю ожидаемые данные, но весы продолжают отправлять данные впоследствии (ES снова и снова) . Мне нужно разобрать только то, что нужно. Ниже приведены выходные данные консоли на моем компьютере.

UART received:  
UART received:  
UART received:  
UART received:  
UART received: 0
UART received: .
UART received: 0
UART received: 0
UART received:  
UART received:  
UART received:  
UART received:  
UART received:  
UART received:  
UART received: ?
UART received: (This is a CR)

UART received: (This is a LF)

UART received:  
UART received:  
UART received:  
UART received:  
UART received: 0
UART received: .
UART received: 4
UART received: 0
UART received:  
UART received:  
UART received:  
UART received:  
UART received:  
UART received:  
UART received: ?
UART received: G
UART received:  
UART received:  
UART received: (CR)

UART received: (LF)

UART received: E
UART received: S
UART received: (CR)

UART received: (LF)
... (The ES loops over and over until the print button is pressed again)

0,00 — это текущее показание весов, а 0,40 — вес тары. Это все, что мне нужно, и я не могу понять, как это разобрать. Блоки имеют разную длину, так как мне извлечь необходимую информацию и игнорировать повторяющийся «ES»? Я не уверен на 100 %, правильно ли я это делаю?

Вывод в формате DEC

UART received: 32
UART received: 32
UART received: 32
UART received: 32
UART received: 48
UART received: 46
UART received: 48
UART received: 48
UART received: 32
UART received: 32
UART received: 32
UART received: 32
UART received: 32
UART received: 32
UART received: 63
UART received: 13
UART received: 10
UART received: 32
UART received: 32
UART received: 32
UART received: 32
UART received: 48
UART received: 46
UART received: 52
UART received: 48
UART received: 32
UART received: 32
UART received: 32
UART received: 32
UART received: 32
UART received: 32
UART received: 63
UART received: 71
UART received: 32
UART received: 32
UART received: 13
UART received: 10
UART received: 69
UART received: 83
UART received: 13
UART received: 10
UART received: 69
UART received: 83
...