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plu no data error?

The cash register keeps ringing when I press any key the screen says
PLU NO DATA ERROR!

How do I get out of this mode
Sandra, January 2014
Sounds like a Samsung with a flat battery. Without any more information such as brand, model and machine history, that's the closest I can guess. Might be best to check the battery and RAM clear it for re-programming. If you need a manual, most are here:

http://the-checkout-tech.com/

Registerman, January 2014