Hi!

You can execute

dmesg | grep tty

in order to get information on the serial ports. You'll find lines like

[...] 481a8000.serial: *ttyS4* at MMIO 0x481a8000 (irq = 187, base_baud = 
3000000) is a 8250

which informs about the port used for a connection, ie. when you plug in 
the Teensy device.

Keep in mind, you cannot power heavy load on the USB port when the BBB is 
powered by USB. You'll need an external power supply (at least 5V/1A).

BR

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