   This firmware is initially loaded into the Temperature Control Laboratory Arduino. 
   The firmware scans the serial port looking for case-insensitive commands:
 
-  Q int     set Heater 1 and 2, range 0 to 255, subject to limits
   Q1 int    set Heater 1, range 0 to 255 subject to limit
   Q2 int    set Heater 2, range 0 to 255 subject to limit
   T1        get Temperature T1, returns deg C as string

  }
  // shutdown
  else if ((cmd == "X") or (cmd.length() > 0)) {
    Serial.println("Unrecognized command. Please reset.");
    setHeater1(0);
    setHeater2(0);
    brdStatus = 0;

  int ByteCount = Serial.readBytesUntil(nl,Buffer,sizeof(Buffer));
  String read_ = String(Buffer);
  memset(Buffer,0,sizeof(Buffer));
   
  // separate command from associated data
  int idx = read_.indexOf(sp);
  cmd = read_.substring(0,idx);
