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Vending machine interface
Communication with the vending machine control is via MDB (Multi Drop Bus).
The KarL4 is compliant with the latest MDB specification version 4.3 from July 2019.
This specification is provided by:
In battery mode, the KarL4 activates the vending machine by placing a card on the NFC antenna
or by inserting a card into the card reader module.
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