... 1.RS-232C interface, convient n etworking. 2.Lack of paper automatic alarm. 3.LCD screen display, English menu clew ... , for diesel smoke discharge of free acceleration,2.Electric suction system, internal microcomputer control, automatic feeding paper, measuring, reseting, washing, ... printer.4.RS-232C interface, convient networking.5.Lack of paper automatic alarm.6.LCD screen display, English menu clew ...