Try /dev/ttyUSB0 and see if that works
The dmesg command will tell you which device is attached.
Here is the output for my pi4, which uses a pl2303 serial/usb adaptor to
connect to a Davis serial logger.
pi@pi4:~ $ lsusb
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 003: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial
Port / Mobile Action MA-8910P <====
Bus 001 Device 002: ID 2109:3431 VIA Labs, Inc. Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
pi@pi4:~ $ dmesg | grep -i usb
[ 1.853807] usb 1-1: new high-speed USB device number 2 using xhci_hcd
[ 2.036438] usb 1-1: New USB device found, idVendor=2109,
idProduct=3431, bcdDevice= 4.21
[ 2.036495] usb 1-1: New USB device strings: Mfr=0, Product=1,
SerialNumber=0
[ 2.036530] usb 1-1: Product: USB2.0 Hub
[ 2.039321] hub 1-1:1.0: USB hub found
[ 2.363822] usb 1-1.3: new full-speed USB device number 3 using xhci_hcd
[ 2.510398] usb 1-1.3: New USB device found, idVendor=067b,
idProduct=2303, bcdDevice= 3.00
[ 2.510458] usb 1-1.3: New USB device strings: Mfr=1, Product=2,
SerialNumber=0
[ 2.510499] usb 1-1.3: Product: USB-Serial Controller
[ 2.510530] usb 1-1.3: Manufacturer: Prolific Technology Inc.
[ 6.685846] usbcore: registered new interface driver brcmfmac
[ 6.767495] usbcore: registered new interface driver usbserial_generic
[ 6.767732] usbserial: USB Serial support registered for generic
[ 6.828565] usbcore: registered new interface driver pl2303
[ 6.828727] usbserial: USB Serial support registered for pl2303
[ 6.898445] usb 1-1.3: pl2303 converter now attached to ttyUSB0
<=========
So for my system using a pl2303 serial to usb adaptor:
port = /dev/ttyUSB0
(apologies if any translation of this gets garbled)
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