I'm having issues with running the serial display I have (Matrix Orbital LK204-25) with my Uno.
I've determined that the serial TX on the Uno is a TTL signal and my LCD is currently set in RS232 mode, which is the signal I need to be in as I need this LCD to work with two different micro-controllers and one of them is only capable of RS232.
Problem being, that even when I hook up the Arduino to a TTL/RS232 conversion chip, I'm still getting garbage on the LCD. I thought that it may have been a baud-rate error but came to the conclusion that it's not after writing a program that tried to display something on all of the preset baud-rates of the LCD.
Any suggestions, ideas, needs for further clarification?