This CEN Report specifies a common interface for the exchange of messages between card acceptors and acquirers or their agents. It defines the message structure, format and content, data elements, and values for data elements. It is based upon the same principles as EN 28583 (ISO 8583) and is intended to be used when EN 28583 is not appropriate. Where possible, data element names and attributes common to ISO usage are employed. Data representation and communication related characteristics such as protocol, header and trailer information, and transmission control are outside the scope of this CEN Report.