Java, Sockets, UTF-8, I cannot understand the format

Question

I am programming using Java for a data acquisition project. I completed the interface to the device part in Python, but it's way too heavy on the processing.

I have been converting it to Java (newbie!) and was able to send and receive the setup data, which are all ASCII.

Once I ask for the data to start flowing, it's like an open faucet.

I can understand the first 4 character but then I don't.

53 31 5C B5 61 99 AB 8B A9 85 91 89 55 85 (Hex)
S  1  This is the echo to say 'starting'
      5C B5 61 99 AB 8B A9 85 91 89 55 85 (Hex)

This is the data I need and how it was sent. I can sniff it on the network monitor.

83 49 92 65533 97 65533 65533 65533 65533 (dec)

I have tried various methods, but currently:

Socket socket=new Socket(ipAddress , portNumber);       //Create Socket
inputStream=socket.getInputStream();
inputStreamReader=new InputStreamReader(inputStream); // Tried (inputStream,"UTF-8")

stringBuffer=new StringBuffer();

public static StringBuffer  recMsg(InputStreamReader inputStreamReader, StringBuffer stringBuffer) throws IOException {
    int x;
    stringBuffer.setLength(0);
    while(true)
    {
        x=inputStreamReader.read();
        stringBuffer.append((char)x);
        //System.out.println("Ready to read:2 "+ inputStreamReader.ready());
        if (stringBuffer.length() >= 500) break;
        if (!inputStreamReader.ready()) break;    //
    }
    System.out.println("Response "+ stringBuffer);
    System.out.println(" --- ");
    return stringBuffer;
}

PS in Python I just used

s.connect((host, port))
s.recv(2048)