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