How to access flight controller console via USB?

I see system console, and I tried to access flight controller with “screen” command via USB.

command is:
screen /dev/tty.usbmodem01 57600 8N1

But it shows stream of unreadable messages(see screen shot), and I can do nothing.

Is this the correct behavior?

Why not use QGC connection?

Because, I’d like to use some commands:

qgc also has this function

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@xdwgood Thank you very much!