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Find out if LCD panel is connected to serial port
Posted: Mon Nov 28, 2022 8:36 am
by madz
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?
Re: Find out if LCD panel is connected to serial port
Posted: Mon Nov 28, 2022 12:18 pm
by Raquel
Hello,
Thank you for posting on the forum.
You can check for ttyUSB0 to know when a display is plugged in.
To further confirm, ask for a module type or version number (please see commands in the manual) and check the display's reply.
I hope this helps.
Thank you,
Raquel
Re: Find out if LCD panel is connected to serial port
Posted: Tue Nov 29, 2022 2:33 am
by madz
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.
Re: Find out if LCD panel is connected to serial port
Posted: Tue Nov 29, 2022 9:01 am
by Raquel
Sorry, I assumed you have a USB model.
Unfortunately, no there is no way of knowing a display was plugged in via the serial com port without writing to it.
Thank you,
Raquel