Hi. I´m working in a proyect with 3 Arduino´s Mega 2560 and I want to send some data from the controler to Node Red. I need to use the Serial In (3 different blocks) and when I ´m trying to assign the port (COM3, COM4 & COM5) I can´t. The program change automatically all ports to the same. Any help please? Thank you 
You are updating the 1 serial config. Thats why all 3 nodes have the same setting.
Instead, add 3 individual configs and set each node to use its own config.
How can I add 3 individual configs? Thank you for your time
open 1 node, select the serial config dropdown, select "add new config", give is a recognisable name like "This is COM 3"
If you are using latest Node-RED, this is simpler - click the [+] button
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