Thanks for the reply Raquel. The serial number is 22M02-1967.
Also on the command lock, it probably filters and see if it's the unlock command before discarding the rest after 254 right?

I'm working with a LK204-7T LCD and it randomly displays garbage characters/ messes up it's contrast etc. after rebooting the unit it's fixed on. My suspicion is the mother board is sending some random data towards it via the serial com port and it somehow manages to turn off the set save data lock ...

I'm connecting the LCD via a serial com port (not a USB serial port) which is a 'ttyS0'. And the machine already has a 'ttyS0' in it regardless if the LCD is connected or not. My issue is identifying if the LCD is connected without having to write to it first.

I have a LK204-7T LCD panel running on a Linux machine connected to a serial com port. I am starting the LCD panel through a startup service. Is there a way to check if the LCD panel is actually connected to the machine before I run my service?

Thanks, that helped

I have a LK204-7T LCD panel which I've set a startup screen using the '2.2 Change the Start Up Screen' described in the manual. When I power off the PC I want the LCD panel to display the startup message, instead it gets stuck on whatever is last shown in the panel. How do I make it show the startup...