Problem with reading data from UART

Projects Networking, Protocols, and Devices
1

hello guys
i have a problem with UART i am trying to send commands to fingerprint sensor and it works well
but when i receive data from it , a problem appeared here , it sends 24 bytes so i tried to store them in an array like this

if(Serial.available() < 24)
   {
    Serial.println("Didn't Recieve the  24 bytes ");
   }
   else 
   {
         for(k=0 ; k<24 ; k++)
           RecieveArray[k] = Serial.read();
         

       char store = RecieveArray[3];

     
         Serial.println(store);

am trying to print the element number 3 of the array to see if it works or not but i receive this

please help and thanks in advance

2

We need to see the rest of the code. Declaration, setup and everything.

How are you expecting the fingerprint sensor to transmit into a pin which is already in use by the serial monitor? Usually you would put the sensor on SoftwareSerial or use a Micro or Teensy that has more serial ports.