B4J Tutorial [ABMaterial] events trigger

Hello,

I don't know if I am handling it the right way.
I have I ABmaterial app running on my RPI.
Now in the main, I have a serial connection with a device that get counters every 60 seconds.
It puts the results in a map.

I made a page that shows the last result. OK for now.
Now I want to ask a specific counter from within that page.
I can execute a function that is located in the main that sends a command to my serial port from the page.
Now I want to send the result of the serial data received to the page directly.
Is this possible?
Maybe trigger an event on the page with parameters

John