HS COM is a software library (with full C source code) that allows a calling user application to access serial communication ports (COM devices) under 32-bit MS Windows operating systems. It allows to transmit data, receive data and control line signals (such as RTS and DTR). HS COM library provides a convenient \"packaging\" to standard Win32 API by exposing only a few simple API services to a calling application -HsCOMInit -HsCOMOpenPort -HsCOMClosePort -HsCOMWriteBuffer -HsCOMExtendedFunc