Table of Contents - APTAStandards.com

The ITSO message body consists of individual transaction blocks,
each one representing
a single business transaction, or device event as illustrated in Exhibit 4.2-1.
Message Header Message Frame
ITSO Message Header
Exhibit 4.2-1 ITSO Message
Structure
Frame Header Message Body
Seq Time Stamp Data MAC
Transaction
Data
Blocks
Message Code Count of Destinations Destinations Data Content
The
data portion of the
transaction data blocks is dependent upon the message type and
c an be configured to send to multiple
destinations. This provision allows flexibility to
separate “on-us” and “not on-us” transactions at the card reader level, and route them
to their respective destinations if desired. Individual transaction data blocks
can
transmit
multiple transactions, essentially acting as a file or batch transfer
of
information.
Listed below are the parts of the Data or the transaction record component of the
transaction
data block:
• Message Code
• Count of destinations
• Destinations
• Data content
The actual data elements are contained within
the data content component of the
tr ansaction record.
4.2.4 Message Types
The ITSO specification provides the data flows and processes for card issuer, product
owner, and retailer and transit service provider.
The specification provides for data to
be directed to any of the following entities:
• A single entity (HOPS)
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