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The secondary bitmap indicates the presence of Data Elements 65 up to 128.

The transaction carries information about the type of transaction, the card used, the merchant, the transaction amount, security information, and so on.

The response, authorizing or declining the transaction, needs to be returned via the same route to the terminal.

In Healthcare industry HL7, DICOM (Digital Imaging and Communications in Medicine) are the protocols implemented by the system, similarly in financial world there are the standards (protocols) ISO8583, ISO7816 etc, for the various kind of data interchange.

ISO (International Organization for Standardization) is a worldwide federation of national standards bodies.

ISO 8593 is Financial Transaction card originated, Interchange message specifications adopted by wide segment of Payment Industry (including Acquirers and Issuers).

Standard can be further extended to support the transactions taking place between POS (Point of Sale Terminals) and Merchant Acquirer.

ISO 8583 specifies message structure, format and content, data element and values of data elements.

Application specification may remain at private level (implementer) and the method (message) by which settlement takes place is not within the scope of ISO.

ISO 8583 also defines system-to-system messages for secure key exchanges, reconciliation of totals, and other administrative purposes.

The header and trailer envelop the application data and are used for routing and message integrity.

The application data consist of ISO message including Message Type Indicator (MTI), BIT MAP (indicating which data elements are present) and ISO Data Element (the fields of the message).

A Message Type Indicator includes the ISO 8583 version, the Message Class, Message Sub-class, and Transaction Originator.

Different versions of the ISO 8583 standard are indicated in the first position of the Message Type Indicator.

For example: 1100 Authorization Request; 1101 Authorization Request Repeat.

For Example: If MTI value is 1200, then from the table above we can find other details.

Second Position is for Message Class and value in MTI is 2, so message is a financial message.

Third position is for message sub-classfunction and the value in MTI is 0, so the given message is a request message.

Fourth position is for Transaction Originator and value in MTI is 0, so the message is coming from Acquirer.

When we consolidate all these we do find that message with MTI value 1200 is an ISO 1993 Financial Request Message sent by Acquirer.

The presence of a data element in a specific message is indicated by a one (1) in the assigned position; a zero (0) indicates the absence of a data element in the assigned position.

8583 Processing Code Values 64 Bits Numbered From

A bit map consists of 64 bits numbered from the left starting with bit 1.

If any ISO message does not support secondary bit map processing, then the first bit of the bit map is 0.

Iso 8583 Processing Code Values