Intermec 6804DM Technical Reference Manual page 95

SECTION 4
Most smart card operating systems (inside the smart card)
do not provide a method of "reading the directory (file struc-
ture)". The file structure and security features are unique
to the application. So although the reader gives access to
"standard card types" (as defined in ISO--7816), it is not
possible to "automatically" read and buffer the smart card
data.
Each application should have a predefined card type as well
as use of that card; the handheld should then have that
knowledge. The application, then, might choose to handle a
microprocessor--based smart card as follows:
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Handheld prompts the user to insert their card.
User inserts the smart card into the card reader slot
waking up the reader>
Handheld polls the reader looking for the card to be
inserted.
Handheld commands reader to power up the card;
reader returns the card's answer to reset (unique to
each card type).
Handheld commands reader to pass commands and
data to the card, selecting files and providing pass-
words and cryptographic keys as required.
Reader returns smart card's response to each com-
mand and data sent from the handheld, allowing the
handheld to determine if proper access has been at-
tained.
Handheld requests data from the card, and reader re-
turns that data.
Handheld provides command with data to be written
to the card, and the reader passes that command and
data to the card and returns the card's response.
When the transaction is complete, the handheld
prompts the reader to power down the card, then
prompts the user to remove the card.
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