How to Connect PMS5003 to Arduino MEGA and what code to use?

Hi everyone! I've been having a hard time here and would appreciate your help. It's just that I've done some research many times on how to connect the PMS5003 to Arduino MEGA but then the code doesn't work, and I don't know what's wrong with this at all. I'm just a beginner, doing a research project that's all. Please help me:'>>

Almost everything you need to know is here

Exactly how do you know the code does not work?

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