Typically, upon connecting the UHF Reader to the USB port, a tty port will appear which looks like ttyACM* in the /dev folder. Connect your UHF Reader to your Linux PC’s USB port and do the following:
ls -alF /dev/ttyACM*
This should show you all the USB Serial Ports available. If none is found, you can force the cdc_acm to fire as follows:
sudo rmmod cdc_acm
sudo modprobe cdc_acm
sudo lsmod | grep cdc
sudo dmesg | grep ttyACM
ls /dev/ttyACM*
This step should fix the ACM issue and you should see a new tty port attached to the Linux PC.