this command doesn't trigger the machine to start measuring you say? you must use

Use PySerial Library: If you are using Python, make sure you use the pyserial library to send commands over the serial port. Here is an example of Python code to send commands using pyserial:

    import serial
     ser = serial.Serial(
           port='COM3',  #use path
           baudrate=9600,  #use baudrate
           parity=serial.PARITY_NONE,
      stopbits=serial.STOPBITS_ONE,
      bytesize=serial.EIGHTBITS,
      timeout=1
       )
      command = b'\x16\x16\x01\x30\x30\x02\x53\x54\x03\x42\x43\x43'
      ser.write(command)
      ser.close()

If it doesn't work, maybe there is an error in your BCC code or can I see your BCC (Block Check Character) code?