code: def on(self):
          
          b1 = self.cnxn.xfer([0x03])[0]          # send the command byte
          sleep(9e-3)                             # sleep for 9 ms
          b2, b3 = self.cnxn.xfer([0x00, 0x01])   # send the following byte
          sleep(0.1)
  
          return True if b1 == 0xF3 and b2 == 0x03 else False
docs: Turn ON the OPC (fan and laser)
  
          :rtype: boolean
  
          :Example:
  
          >>> alpha.on()
          True