How to write to 2nd line of display?

[JonL]

Just started experimenting with a new CFAH2002Y-PDI-ET, but can't write to the 2nd line.

Also, I'm experiencing problems writing to the 1st line: characters are often off-screen.

Any hints on what to check?

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[cosmicvoid]

What commands are you using to address the second line?

 

[JonL]

I'm using the LCD4linux application and I'm looking at the source code to find out what's wrong...