> I can not get data from the serial> port using events
Make sure you are compiling the project using the .net 2.0 compatibility. This will include the assemblies needed to access Serial Ports.
[https://docs.unity3d.com/Manual/class-PlayerSettingsStandalone.html][1]
> Do I have to write the DLL in C/C++> and have the Pro version?
No, you can use the Free version.
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There are many resources online that talk about communicating to via a Serial Port with Unity. I found this one that is a good starting point:
http://www.dyadica.co.uk/unity3d-serialport-script/
[1]: https://docs.unity3d.com/Manual/class-PlayerSettingsStandalone.html
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