Hello Troy.

As I wrote before. I use Hardware Release 1.20 and on the display is Version 1.55 written . So the manual just says that I can change the baud rate and or the i2c master or slave address.

As I also tried to explain before, I use a max232 to convert from ttl to rs232 level.
It still ...

When I connect my lcd2041 with my ardunio via serial and standard 19200 I get only a triangle per string I send.

When I connect my arduino to the pc-rs232 and send the same string it looks good.
When I connect my display on the pc-rs232 it also looks good.
But arduino with display doesn't work ...