How do I check COM ports?

Support Printers
1

Want to find out what COM port a USB Serial plotter is attached to. What’s the quickest way to do that?

2 
man lsusb
3

Thank you.

Bus 002 Device 010: ID 0403:6001 Future Technology Devices International, Ltd FT232 Serial (UART) IC

So, is that COM2 or COM10?

4

Why do you need to know this? The COM1/COM2 vernacular is specific to DOS and Windows, not to UNIX.

Anyway, it’s probably COM10 then.

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5

I really don’t know, I’m new to Linux and when I use Windows I had to set the COM port in the software to get anything to output to the plotter.

Did some googling and it said to use /dev/ttyUSB0 but that didn’t work.

6

I’m no specialist on account of printers, but if you direct your browser to http://127.0.0.1:631/admin, then you should be able to scan for connected printers and configure them.

That IP address is your localhost.localdomain address, so it’s unroutable from the internet, by the way. It’s the internal IP address that every computer uses for connecting to itself via the network protocol, and this is independent of the operating system ─ Windows has that too. Port 631 is the port that your CUPS daemon is listening on.

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