When I reading a document on the Internet:
go into the properties of your serial-to-USB adapter in Device Manager. It will tell you right there which port it is using.
if on Mac, how to see the Device Manager?
1 Answer
The Mac doesn't have a device manager, because mainly devices manage themselves; they almost never need fiddling with or new drivers adding.
The closest equivalent is the System Report, accessed from
menu > About this Mac > System Report...
If any device has adjustable parameters, they will be in a Prefs Pane instead, in System Preferences.
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