Specifications

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2.4.2 Communication Functions
Reading and writing data with a smart card is performed by the way of contactless communication
between the integrated NFC module in the terminal and that smart card. Smart card is
preprogrammed by the manufacturer to perform certain operations in response to prescribed
commands. When a command is correctly transmitted by the terminal via the NFC to smart card,
the smart card responds to the received command by performing a corresponding operation. Once
the operation is complete, the smart card then transmits response indicating the result of the
operation.
An explanation of the functions relating to this communication process is provided below.
Card Polling Function
This function carries out the following performances.
• Searches smart cards within the communication range
• Detects smart card
• Activates smart card
• Retrieves smart card response information
The card polling function terminates searching smart cards either when it detects a smart card, the
preset timeout elapses, the assigned callback function returns 'FALSE', or the 'stop polling'
function is carried out.
Once the smart card has been successfully activated, the NFC module continually transmits radio
waves in order to supply power to the smart card. This radio wave transmission terminates
automatically when the 'radio off' function is carried out or when a certain preset time elapses
without any communication between the NFC module and the smart card. It is possible to enable
or disable the automatic stop (auto stop) setting and to change the time until the auto stop occurs
(i.e. the timeout). Under the default settings, the auto stop is set effect and the timeout is set to
1,000 milliseconds.
About IC card search method
There are following search methods.
Search method Detail Usage
Normal mode One piece IC card will be started. Search operation
will be terminated by the following condition.
. Find one IC card
. Passed timeout period
. Specified call back function return FALSE
. Execute polling stop function
This is simple method for
communicate with one
IC card, normally this
method should be used.