The setserial is a program designed to set and/or report the configuration information associated with a serial port. Use the setserial command to check and use serial ports Here is how it looks when I attached USB device: Listing and using USB serial ports on Linux So I have cp210x chipset based USB serial. usbserial: USB Serial support registered for cp210x usbserial: USB Serial support registered for generic usbcore: registered new interface driver usbserial_generic usb 1-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3 usb 1-4.4.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 usb 1-14: New USB device strings: Mfr=0, Product=0, SerialNumber=0 usb 1-4.4: New USB device strings: Mfr=0, Product=1, SerialNumber=0 usb 1-9: New USB device strings: Mfr=0, Product=0, SerialNumber=1 usb 1-4: New USB device strings: Mfr=1, Product=2, SerialNumber=0 usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 usb 4-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0 usb usb4: New USB device strings: Mfr=3, Product=2, SerialNumber=1 usb usb3: New USB device strings: Mfr=3, Product=2, SerialNumber=1 usb usb2: New USB device strings: Mfr=3, Product=2, SerialNumber=1 usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1 Sample outputs: Serial: 8250/16550 driver, 32 ports, IRQ sharing enabled # use grep command/ egrep command to filter out USB devices # Here is what the dmesg command displays when you enter USB adapter into system’s port: Such serial to USB adapter connects to devices for configuration or programming under Linux. USB to RS232 adapter cable connects from the USB port of a computer to a device. $ grep -i 'tty' /var/log/dmesg A note about USB based serial ports Or use the following grep command or egrep command: Here is what I see: serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A Display Detected System’s Serial Support Under Linux
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