Make sure you set each PLU to link to TAX1 if you want automatic tax. The default is no tax linked to any PLUs.
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If anyone needs a Samsung / Sam4s ER-5200m or ER-5240m manual, try here:
http://the-checkout-tech.com/manuals/cashregisters/Samsung_ER-5200M_and_ER-5240M_operating_programming_manual.html
Registerman
January 2011