Remain part of reading data from multiple serial ports is as follows. Handler.h file [crayon-5bcf2d43a4c47880278951/] Handler.cpp class [crayon-5bcf2d43a4c5a259616033/] Now, create multiple objects of handler class, set configurations and call COMListen method to read data as example given below. [crayon-5bcf2d43a4c67790908111/]