The control comes in different forms such as ActiveX control, .Net component and Borland/Builder component. It allows use of native component in different developer environments.
No need to check ports periodically if there is new data. Simply define a function for needed event and process the data.
Just drop a control on a form in any development environment and compare this to writing thousands of lines of code.
Find out how Serial Port Control can be used in real business tasks.
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