Zeroplus Arduino starter kit with Logic Analyzer Manual page 115

Observe that the message is now longer and there is only one
segment highlighted.
We can conclude that the LEDs receives or not the data depending
on the position of the switches. This looks a lot like an address.
Many protocols assign an address to each device connected on the
same bus so they can communicate to each other easily because
only the device matching with the address in the request will
acknowledge that request. In the fol lowing paragraphs we will call
this button the button Address.
Now we are going to see what happens on the serial monitor.
21. In the Arduino IDE, open the serial monitor.
22. Press the buttons Data and Send. The color of the LED changed
but nothing appeared in the serial monitor.
23. Press the button connected to the pin 2 of the Arduino board.
Then press the button Send.
24. In the serial monitor you should see a number with 4 digits,
see below.
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