On my laptop, if I connect a USB cable to an arduino board, it shows up as a com port under arduino tools. On the Kingdel, it does not. Of course the laptop does not have any actual serial ports-just the usb port. ----- Original Message ----- From: "Iznogoud" <iznogoud at nobelware.com> To: "tclug-list" <tclug-list at mn-linux.org> Sent: Friday, February 21, 2020 11:34:48 AM Subject: Re: [tclug-list] usb com ports > > I have a little kingdel box that has 5 actual, 9 pin serial ports. I am working with arduino and need my active usb port to show up as a com port, but it doesn't. > Not particularly clear on what this means, where the USB is, etc. But, if you are going USB-serial with an FTDi based chip (on the cable), Linux will see it immediately as a "COM port" and setup a /dev/ttySx for it. (The device permissions will be as the distro decides, etc.) > ls /dev/tty* does not list any usb devices. Is there a way to make the usb port a com port in this case? > USB ports cannot just act as COM ports. They need the kernel to treat whatever is attached to that USB port as a device with an associated driver. If you plug a USB device to a running Linux kernel it will find it, and if it is a healthy one it should show up with 'lsusb', like this: iznogoud% lsusb Bus 002 Device 002: ID 0bda:0328 Realtek Semiconductor Corp. Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 001 Device 006: ID 413c:2011 Dell Computer Corp. Multimedia Pro Keyboard Bus 001 Device 004: ID 413c:1005 Dell Computer Corp. Multimedia Pro Keyboard Hub Bus 001 Device 007: ID 0424:4060 Standard Microsystems Corp. Ultra Fast Media Reader Bus 001 Device 005: ID 0424:2640 Standard Microsystems Corp. USB 2.0 Hub Bus 001 Device 003: ID 0424:2514 Standard Microsystems Corp. USB 2.0 Hub Bus 001 Device 002: ID 0461:4d51 Primax Electronics, Ltd 0Y357C PMX-MMOCZUL (B) [Dell Laser Mouse] Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub iznogoud% _______________________________________________ TCLUG Mailing List - Minneapolis/St. Paul, Minnesota tclug-list at mn-linux.org http://mailman.mn-linux.org/mailman/listinfo/tclug-list