Appendix G. Contactless ATM Requirements
Transaction Acceptance Device Guide (TADG)
G.2.21
Error Conditions
Due to the nature of contactless communications and cardholder behavior, communication errors are likely to occur on a relatively frequent basis. From a user interface perspective, it is required that contactless-enabled ATMs do not report, display, or act on recoverable communication errors other than to attempt to re-establish communication with the card or, in the case of an unrecoverable communication error, restart Discovery Processing as specified in Visa Contactless Payment
Specification and EMV Contactless Specifications for Payment Systems.
Unrecoverable communication errors are described in EMV Contactless Specifications for Payment
Systems, Book D as transmission, protocol, or timeout errors. In all cases, the response of the reader is the same, as defined in the below section titled Error Condition – No Response From Card.
Contactless ATMs must be capable of capturing and logging the error conditions described in the following sections:
•
Error Condition: No Response From Card
•
Error Condition: Collision Detected
•
Error Condition: Unsupported Card or Application Error
Error Condition: No Response From Card
If an unrecoverable communication error (as defined in EMV Contactless Specifications for Payment
Systems) occurs between the card and reader:
• The contactless-enabled ATM shall not display or report the error to the cardholder.
•
The reader shall return to Discovery Processing and attempt to re-initiate communication with the card.
Error Condition: Collision Detected
If the reader detects multiple cards during discovery processing, the contactless-enabled ATM shall display the
“Please present one card only” message (as specified in EMV
Contactless Specifications for Payment Systems).
After the cards have all been removed, the reader shall restart discovery processing.
It is recommended for the ATM to attempt multiple discovery cycles to detect potential collisions and thus ensure that only one card is present. This will prevent the initiation of a transaction with an unexpected card.
November 2016 Visa Public 233
