ok lets go back to my previous question first and then i move on to the touch buttons.

first of all i have been in touch with the guys from 4D system. I have asked them how is it possible to display two line at the same time.

They told me that the display has a TX output that send to the microcontroller a signal of ACK $06.

So the microcontroller needs to wait first for the ACK and then to check the second command and display both at the same time.

Is there any example here in the forum that can guide me how to wait for the ACK of an exernal device?

I guess that has to do with serial in and serial out ports.

So what i have to do is that one i send the comand to the display, i need to wait on the RX on microcontroller the right $06. If it read that it is right then i move on the next command.

could you please help me a bit?

thanks,