The machine is closed simply because you haven't opened it. This means no one has logged on to make a transaction. logging on is the first thing you do so it is ready to go as soon as you log on. Type your PIN number and press CLK# button. If you have RAM cleared it, the default operator logon is 1.
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If anyone needs more information, the Samsung ER-5200m manual is here:
http://the-checkout-tech.com/manuals/cashregisters/Samsung2.php
Registerman
May 2012