Hi,
As far as I know, scr331-DI does not support multiple conatctless
cards communication. When 2 or more cards are kept on reader,
whichever card first responds properly to the reader commands is
established communiaction with and proceeded.
tx,
Joe.
On 9/21/05, Arthur Chiu <[EMAIL PROTECTED]> wrote:
> Since you mention ISO/IEC 14443 allow more than one card to be detected, is
> there a function call in the pcsclite library that allows detection of card?
> I am looking for something similar to SCardListReaders, but instead, it will
> list the cards that the reader detected. Thanks!
>
> Cheers,
>
> Arthur
>
>
> On 9/20/05, Peter Tomlinson <[EMAIL PROTECTED]> wrote:
> > ISO/IEC 14443 allows for more than one card to be detected. One is then
> > put into hibernation while the other is accessed. Then swap over if that
> > is what you want to do. If you try to close one card, it is very
> > possible that you will turn off the activating field and both will be
> > closed!
> >
> > Whether the SCR-331 supports this, I do not know. The same for Mifare: I
> > do not know if it supports the suspend and wakeup commands. Nor do I
> > know if the software that you are using supports it.
> >
> > There is a hardware issue: two cards very close together do affect one
> > another, and sometimes both will work, sometimes one will work,
> > sometimes neither will work.
> >
> > Peter
> >
> > Arthur Chiu wrote:
> >
> > > Would it be possible for a contactless reader (I am using SCR331-DI)
> > > to detect 2 cards at once? Meaning, I place 2 mifare cards on top of
> > > the wireless reader, establish connection with one of them, do some
> > > data transfer, cloes connection and connect the other one. Would this
> > > be possible? This is what I am doing right now:
> > >
> > > while((Reader[0].dwEventState & SCARD_STATE_PRESENT) !=
> > > SCARD_STATE_PRESENT) { ret =
> SCardGetStatusChange(ContextHandle,
> > > MINTIMEOUT, Reader, 1); }
> > >
> > > I first use a while loop to detect that a card has been inserted
> > > (contactless). Then I use this:
> > >
> > > ret = SCardConnect(ContextHandle,Readername,
> SCARD_SHARE_SHARED,
> > > SCARD_PROTOCOL_T0 | SCARD_PROTOCOL_T1, &CardHandle,
> &Protocol);
> > >
> > > to establish a connection with the card before I begin transaction
> > > and data transfer. So, if I put two cards on top of the reader, what
> > > would be different or needed in order to detect both? I tried running
> > > pcscd in foreground, but after it detects the insertion of the first
> > > card, and I put the second card on top, there is no reaction. What
> > > can I do? Or it is a limitation of the hardware that I can't do this?
> > >
> > >
> > > Thanks a lot for all help in advance. :)
> > >
> > > Cheers,
> > >
> > > Arthur
> > >
> >
> >
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> >
>
>
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