Orange Pi R1 Plus - Use Debug Serial Port on Ubuntu

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3) The GND, TX and RX pins of the USB to TTL module need to be connected to the
debug serial port of the development board through a Dupont cable
a. Connect the GND of the USB to TTL module to the GND of the development
board
b. Connect the RX of the USB to TTL module to the TX of the development board
c. Connect the TX of the USB to TTL module to the RX of the development board
4) The schematic diagram of connecting the USB to TTL module to the computer and
the Orange Pi development board is shown below
2.7.2.
How to use the debug serial port on Ubuntu platform?
1) If the USB to TTL module is connected normally, you can see the corresponding
device node name under /dev of Ubuntu PC, remember this node name, you will use it
when setting up the serial port software later
test@test:~$ ls /dev/ttyUSB*
/dev/ttyUSB0
2) There are many serial debugging software that can be used under linux, such as putty,