stand by:LED display communication dataMachine tool PLC data reading and writing;Monitor data read and write and PTZ control;Centralized control of household appliances;Access control system; one card;Various industrial automation; instrumentation;Parking lot; bus charge;Canteen sales system; staff attendance machine;Highway toll station; ATM machine;Adopt CH340 chip, support system: WindowsXP, Vista, Windows 7.The output terminals A (D +), B (D-) are connected to the equipment.