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Trying to connect USB serial port device to raspberry Pi4.

But command below does not show any changes

ls -l /dev/tty*

I was expected to get new device that starts with /dev/tty . Correct me if I'm wrong.

How to solve missing com port problem?

UPD

This is CDC class device and serial device works fine on Windows.

I have tested by connecting device to Ubuntu and Pi4:

Ubuntu lsusb brings additional line:

Bus 001 Device 005: ID 045b:5310 Hitachi, Ltd Crypto

dmesg | grep tty brings additional line:

cdc_acm 1-2.2:1.0: ttyACM0: USB ACM device

Pi4

lsusb brings additional line:

Bus 001 Device 005: ID 045b:5310 Hitachi, Ltd Crypto

dmesg | grep tty brings nothing

How to get serial device on Pi like it appears on Ubuntu onttyACM0 ?

Improve this question
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  • 1
    start the Pi; plug in the device and check the log with dmesg
    – Dirk
    Commented Mar 31 at 20:02
  • Are you sure the USB device is emulating a USB/CDC (Communications Device Class)? For instance, if it was emulating a USB/MSC (Mass Storage Class) then likely the built in LInux UDEV rules would create a /dev/sd* entry instead of a /dev/tty* entry.
    – st2000
    Commented Mar 31 at 21:38
  • 1
    Also, use the command "lsusb" before and after plugging in the USB device and let us know what changes.
    – st2000
    Commented Mar 31 at 21:40
  • I have updated question body with more info
    – vico
    Commented Apr 2 at 14:42

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