... , voltage regulator, 2 channels DB-9 serial port connector, 1 USB connector, switches and LED which is used to control and ... cables of RS-232 or USB It is widely applied for card terminal , keypad password and so onKey feature:Loading codes easily ... emulation, datas entry , IC controlledProvide schematic diagram and easy design for PCBFunction feature:Memory : Program memory connects 2PCS 512KB SRAMs, ...