GPIO binding serial communication

Setup, Configuration and Use Beginners
1

I have installed openhab on my raspberry pi and try through GPIO binding to communicate serial with an arduino. I want to sent a string to my arduino . What can I do?

2

See the GPIO binding.

3

I have read the GPIO binding. The only thing I can do is to sent ON, OFF. I want to sent a string like “Hello World”. Is it possible ?

4

Not with the GPIO binding. GPIOs are just pins that either carry current (ON) or not (OFF). You could try to implement some sort of protocol where you turn it on and off rapidly to represent some value but you are unlikely to get that working in OH.