OpenHABian - RS232 Projector Control Advice needed

I am a happy openHABian user since some weeks.

Now, I’d like to control my projector using the Epson binding and a usb-to-rs232 adapter. As a linux newbie, this is a bit challenging.

I went into the openHABian configuration and enabled menu 20 (serial port) by accident. As far as I understand, this was a mistake. How can I undo this?

In addition, the whole internet seems to talk about accessing serial devices in /etc/tty, which doesn’t exist in openHABian. I assume, I miss something?

So far, I managed to identify my usb cable using the command lsusb, which gave the following output:

Bus 001 Device 004: ID 0403:6001 Future Technology Devices International, Ltd FT232 USB-Serial (UART) IC
Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp. SMSC9512/9514 Fast Ethernet Adapter
Bus 001 Device 002: ID 0424:9514 Standard Microsystems Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

The command ll /sys/class/tty/ttyUSB* returns

lrwxrwxrwx 1 root root 0 Dec 9 16:26 /sys/class/tty/ttyUSB0 -> …/…/devices/platform/soc/3f980000.usb/usb1/1-1/1-1.4/1-1.4:1.0/ttyUSB0/tty/ttyUSB0/

And the epsonprojector.cfg file has the entry:

beamerWohnen.serialPort=/sys/class/tty/ttyUSB0

Any hint about how I can proceed?

Thx, G.

beamerWohnen.serialPort=/dev/ttyUSB0

would be more common, as /dev/ represents the devices, /sys/class is a listing of classes (as the path suggests…)
In question of enabled serial port, this should not harm, as long as you don’t use the GPIO pins which are used for serial connections.