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→Connection instruction of debugging serial port
<p>'''Before purchasing a USB to TTL module, please confirm that the module supports a baud rate of 1500000.'''</p></big>
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[[File:pi3b-img155.png]]
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<ol start="2" style="list-style-type: decimal;">
<li>The corresponding relationship between GND, RXD and TXD pins of the debugging serial port of the development board is shown in the figure below</li></ol>
[[File:pi3b-img156.png]]
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<ol start="3" style="list-style-type: decimal;">
<li>The GND, TXD and RXD pins of the USB to TTL module need to be connected to the debugging serial port of the development board through a DuPont line</li></ol>
:b. The '''<span style="color:#FF0000">RX of the USB to TTL module is connected to the TX</span>''' of the development board
:c. The '''<span style="color:#FF0000">TX of the USB to TTL module is connected to the TX</span>''' of the development board</blockquoteol>
<ol start="4" style="list-style-type: decimal;">
<li>The schematic diagram of connecting the USB to TTL module to the computer and the Orange Pi development board is as follows</li></ol>
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{| class="wikitable" style="background-color:#ffffdc;width:800px;" |-| <big>'''The TX and RX of the serial port need to be cross-connected. If you don’t want to carefully distinguish the order of TX and RX, you can connect the TX and RX of the serial port casually first. If there is no output in the test, then exchange the order of TX and RX, so there is always a the order is right'''</big>|}</ol><span id="how-to-use-the-debugging-serial-port-on-the-ubuntu-platform"></span>
=== How to use the debugging serial port on the Ubuntu platform ===