Developing Flow For User Application Program - Unitech MR350 MKII Software Manual

1.3 Developing flow for user application program

Below diagram is a flow chart for developing Smart Card application program.
Check Smart Card is inserted ?
Power on Smart Card
Exchange message
Power off Smart Card
Check Smart Card is
According above diagram, user should follow this flow chart to develop their application program.
Step 1: There is a detector in Smart Card reader to check whether Smart Card is inserted into
reader. MR350MKII also provides function call to get its status.
Step 2: According ISO standard, Smart Card reader will not always supply power to VCC pin,
application program should execute a special function call to inform Smart Card reader to
provide power to Smart Card
Step 3: After Smart Card are inserted into reader and reader feeds VCC to this card, application can
access this card by system function call or function library.
Step 4: Before removing Smart Card from reader, application program should power off Smart
Card to avoid possibly damaging Smart Card when user inserts or removes it.
Step 5: This step is the same with step 1. Application program can use function call to know
whether Smart Card still stays in reader.
(AH=0)
(AH=1)
(AH=3)
(AH=2)
removed ?
Vcc output to Smart Card
This step is necessary before taking Smart
Card out, or the Smart Card may be
damaged.
8