BOOL Rs232SetCommunicationTimeoutsWin32(DWORD ReadIntervalTimeout, DWORD ReadTotalTimeoutMultiplier, DWORD ReadTotalTimeoutConstant, DWORD WriteTotalTimeoutMultiplier, DWORD WriteTotalTimeoutConstant)
BOOL Rs232OpenPortWin32(TCHAR *CommPort)
BOOL Rs232ClosePortWin32(VOID)
BOOL Rs232ReadByteWin32(BYTE *DataByte)
BOOL Rs232ConfigurePortWin32(TCHAR *DeviceControlString)
BOOL Rs232WriteByteWin32(BYTE DataByte)