= 2026-05-01 Friday = 

After a power cycle on the radio while the Raspberry Pi remained
powered I found that annoying aspect of linux and USB-Serial
adaptors (again)... the allocation of the ttyUSBx changed which 
meant that the software (fldigi), which was expecting to find the
radio at /dev/ttyUSB0, couldn't connect to the radio....

.....because the radio is now at /dev/ttyUSB1.

I've seen this before, and the solution was to create a
UDEV rule to allocate a symlink from a fixed device name pointing 
to the real ttyUSB.


First find the _idProduct_ and _idVendor_ attributes for the device
with the command:

udevadm info -a -n /dev/ttyUSB0

(assuming the item is currently identified as ttyUSB0)

For the IC-7200 radio this gives us idProduct = 2502 and idVendor =
0424.

Write a new rule in /etc/udev/rules.d/

99-usb-serial.rule

containing:


SUBSYSTEM=="tty", ATTRS{idVendor}=="0424", ATTRS{idProduct}=="2502", SYMLINK+="ic7200"

Tell udev to read the new rule

udevadm control --reload

and reboot/replug the device...

and now it'll be found at /dev/ic7200 whichever /dev/ttyUSB device
it's allocated by the kernel.

Now just use /dev/ic7200 in the config of fldigi/flrig etc....