I use a USB to serial adapter with a ch340 chip. I pluged it to the internal USB connector and make a UDEV-rule for safety connection to the right USB.
SUBSYSTEMS=="usb", KERNEL=="ttyUSB*", ATTRS{idVendor}=="1a86", SYMLINK+="LCD"
Then I use the User Scripts Plugin to display some informations:
At Startup of Array:
#!/bin/bash
hostname=$(hostname)
ip=$(hostname -I | cut -d' ' -f1)
stty -F /dev/LCD 1200
echo -e "M\x5E\x1" > /dev/LCD
echo -e "M\x0C\x0 $hostname " > /dev/LCD
sleep 2
echo -e "M\x0C\x1 $ip " > /dev/LCD
At Stopping of Array:
#!/bin/bash
stty -F /dev/LCD 1200
echo -e "M\x5E\x1" > /dev/LCD
echo -e "M\x0C\x1 reboot/shutdown " > /dev/LCD
It is a quick and dirty job, but it works.