Remain part of reading data from multiple serial ports is as follows. Handler.h file [crayon-5d5c242f3e0a6443726052/] Handler.cpp class [crayon-5d5c242f3e0b6707926877/] Now, create multiple objects of handler class, set configurations and call COMListen method to read data as example given below. [crayon-5d5c242f3e0c3590608883/]