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2013 First Data Corporation. All rights reserved. All trademarks, service marks and trade names referenced in this material are the. If the terminal shows an exclamation at the top bar, this means that the terminal holds data that it failed to synchronize with the Adyen payments platform dueVERIFONE VX 820 DUET. Error Messages instructions in the Guide provided with your terminal. 'Comms Error' on-screen, first attempt to. MANUAL. VERIFONE VX820 DUET Disconnecting the power during a transaction may cause transaction data files not must be removed first in these cases. View and Download First Data VeriFoneVX820 Duet quick setup manual online. Credit Card Terminal. VeriFoneVX820 Duet touch terminals pdf manual download. View and Download First Data VX820 Duet quick reference manual online. VX820 Duet touch terminals pdf manual download. Moneris® VX 820 Duet: Reference Guide. 6. Hardware setup. Follow these instructions to set up your terminal hardware. 1. Connect the VX 820 terminal to the VeriFoneVX820 Duet Quick Setup Guide VX820Duet-QSG-2015-08 (English) VX820Duet-QSG-2015-08 (English) Thank you for choosing a First Data Terminal First Data