** This application do not "support Windows 10 S". ** This application is simple COM port comminucation testing utility that has binaly data , ASCII data and cyclic sending modes. It use for debuging embedded systemwith UART interface or simulate to PC RS232C comminucation. This application can also use to various virtual COM Ports (FT232, PL230x, MCP evaluation board and so on). For testing to embedded system, other COM port application or wireless serial comminucation device.