* Two RS232 port * Tank level fuel sensor * Mobile data terminal * ... lower battery alert, GPS blind area alert * IO port: 5 digital input for detect door, engine, window ... output for control engine, door, window 4 analog port for optional accessory temperature sensor, weight sensor ,tank ... fuel level sensor, seat pressure sensor 2 serial port (RS232 port) for optional accessory for CCD camera, RFID reader ...